[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

CN100426691C - RAKE receiving method and RAKE receiver using the method - Google Patents

RAKE receiving method and RAKE receiver using the method Download PDF

Info

Publication number
CN100426691C
CN100426691C CNB2005100719735A CN200510071973A CN100426691C CN 100426691 C CN100426691 C CN 100426691C CN B2005100719735 A CNB2005100719735 A CN B2005100719735A CN 200510071973 A CN200510071973 A CN 200510071973A CN 100426691 C CN100426691 C CN 100426691C
Authority
CN
China
Prior art keywords
channel
signal
rake
factor
multipath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB2005100719735A
Other languages
Chinese (zh)
Other versions
CN1870451A (en
Inventor
段为明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Huawei Technologies Co Ltd
Original Assignee
Shanghai Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Huawei Technologies Co Ltd filed Critical Shanghai Huawei Technologies Co Ltd
Priority to CNB2005100719735A priority Critical patent/CN100426691C/en
Publication of CN1870451A publication Critical patent/CN1870451A/en
Application granted granted Critical
Publication of CN100426691C publication Critical patent/CN100426691C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

本发明公开了一种移动终端采用的瑞克接收方法及应用这种方法的瑞克接收机,所述方法包括:采用不同小区的扰码和公共导频符号序列对接收的数字采样信号进行多径搜索,得到各路多径信号的多径时延;根据搜索得到的多径时延,使用多个瑞克接收支路分别对各路多径信号进行解扩、信道估计和信道纠偏处理,得到各个瑞克接收支路的输出数据序列;在所述信道估计中,每个瑞克接收支路根据本支路的下行公共导频信号进行相位估计,根据本支路的下行专用导频信号进行幅度估计;在信道纠偏后,将各个瑞克接收支路的输出数据序列进行合并,得到移动终端的接收信号。上述方法可以在软切换的情况下实现各路多径接收信号的最大比合并,提高瑞克接收的接收性能。

Figure 200510071973

The invention discloses a rake receiving method adopted by a mobile terminal and a rake receiver applying the method. The method includes: multiplexing the received digital sampling signal by using scrambling codes and common pilot symbol sequences of different cells. Path search to obtain the multipath time delay of each multipath signal; according to the multipath time delay obtained by searching, use multiple rake receiving branches to perform despreading, channel estimation and channel correction processing on each multipath signal respectively, Obtain the output data sequence of each rake receiving branch; in the channel estimation, each rake receiving branch performs phase estimation according to the downlink common pilot signal of the branch, and performs phase estimation according to the downlink dedicated pilot signal of the branch Amplitude estimation is performed; after channel correction, the output data sequences of each rake receiving branch are combined to obtain a received signal of the mobile terminal. The above method can realize the maximum ratio combination of multipath received signals of each path in the case of soft handover, and improve the receiving performance of rake reception.

Figure 200510071973

Description

一种瑞克接收方法及应用该方法的瑞克接收机 A rake receiving method and a rake receiver applying the method

技术领域 technical field

本发明涉及到无线通信系统的数据接收技术,特别涉及到一种移动终端采用的瑞克(RAKE)接收方法,及应用该方法的RAKE接收机。The invention relates to a data receiving technology of a wireless communication system, in particular to a RAKE receiving method adopted by a mobile terminal and a RAKE receiver applying the method.

背景技术 Background technique

RAKE接收是码分多址系统普遍采用的一种分集接收方法,所述的RAKE接收充分利用了无线通信的多径效应,对每一路的多径信号分别进行解调,然后再叠加输出,因此可以通过多径分集获得最佳的接收性能。应用RAKE接收方法接收数据的接收机称为RAKE接收机。RAKE reception is a diversity reception method commonly used in code division multiple access systems. The RAKE reception fully utilizes the multipath effect of wireless communication, demodulates the multipath signals of each path, and then superimposes and outputs them. Optimum reception performance can be achieved through multipath diversity. A receiver that receives data using the RAKE reception method is called a RAKE receiver.

在现有的移动通信系统中,基站以及移动终端均可以使用所述的RAKE接收方法接收无线信号,以达到增强接收效果的目的。已知移动终端采用的RAKE接收方法主要包括以下步骤:In an existing mobile communication system, both the base station and the mobile terminal can use the RAKE receiving method to receive wireless signals, so as to achieve the purpose of enhancing the receiving effect. The known RAKE receiving method adopted by the mobile terminal mainly includes the following steps:

A、在区分出来自不同小区的接收信号后,分别对每个小区的信号进行多径搜索,得到每个小区各个多径信号的多径时延。A. After distinguishing the received signals from different cells, perform multipath search on the signals of each cell respectively, and obtain the multipath time delay of each multipath signal of each cell.

由于诸如码分多址系统、宽度码分多址系统以及时分双工同步码分多址系统等无线通信系统支持软切换功能,因此,这些无线通信系统的移动终端除了要接收本小区的多径信号之外,还要接收其他小区的多径信号。Since wireless communication systems such as code division multiple access system, width code division multiple access system and time division duplex synchronous code division multiple access system support soft handover function, mobile terminals of these wireless communication systems need to receive the multipath In addition to receiving signals, it also needs to receive multipath signals from other cells.

B、对每个小区,根据搜索得到的各个多径信号的多径时延,使用多个RAKE接收支路分别对各个多径信号进行解调。B. For each cell, according to the multipath time delay of each multipath signal obtained through searching, use multiple RAKE receiving branches to respectively demodulate each multipath signal.

所述解调包括:每个RAKE接收支路对本支路的多径信号顺序进行解扩、信道估计和信道纠偏处理。The demodulation includes: each RAKE receiving branch sequentially performs despreading, channel estimation and channel correction processing on the multipath signal of this branch.

其中,所述的信道估计就是根据本支路的多径信号估算出本RAKE接收支路的信道衰落因子Ae,包括:幅度因子A和相位因子eWherein, the channel estimation is to estimate the channel fading factor Ae of the RAKE receiving branch according to the multipath signal of the branch, including: the amplitude factor A and the phase factor e .

所述信道纠偏的方法为:首先,对信道估计得到的信道衰落因子Ae取共轭,然后再将取共轭后的信道衰落因子Ae-jω与解扩后的数据序列进行乘积运算。本领域的技术人员可以理解,上面所述的信道纠偏,一方面能够纠正由于信道衰落所导致的接收数据序列相位旋转,另一方面还相当于根据每个RAKE接收支路信道衰落因子的幅度A对每个RAKE接收支路输出的数据序列进行幅度加权。也就是说,经过上述信道纠偏处理后,各个RAKE接收支路输出数据序列的相位基本一致,并且信号幅度大的多径信号加权的权重大,信号幅度小的多径信号加权的权重小,以便在各个多径信号合并时实现最佳的合并效果。The channel correction method is as follows: first, conjugate the channel fading factor Ae obtained by channel estimation, and then perform a product operation on the conjugated channel fading factor Ae -jω and the despread data sequence. Those skilled in the art can understand that the channel correction described above, on the one hand, can correct the phase rotation of the received data sequence caused by channel fading, and on the other hand, it is equivalent to the amplitude A of the channel fading factor of each RAKE receiving branch. Amplitude weighting is performed on the data sequence output by each RAKE receiving branch. That is to say, after the above-mentioned channel correction processing, the phases of the output data sequences of each RAKE receiving branch are basically the same, and the weight of the multipath signal with a large signal amplitude is large, and the weight of the multipath signal with a small signal amplitude is small, so that The best combination effect is achieved when combining various multipath signals.

C、将每个RAKE接收支路输出的数据序列进行合并,得到移动终端的接收数据序列。C. Combine the data sequences output by each RAKE receiving branch to obtain the received data sequence of the mobile terminal.

本步骤所述合并为:将每个RAKE接收支路输出的数据序列按照无线帧和时隙位置在时间上对齐,然后按对应位相加,得到移动终端的接收数据序列。The combination described in this step is: aligning the data sequence output by each RAKE receiving branch in time according to the radio frame and time slot position, and then adding corresponding bits to obtain the received data sequence of the mobile terminal.

由于,在上述步骤B所述的信道纠偏过程中,已经根据每个RAKE接收支路信道衰落因子的幅度对每个RAKE接收支路输出的数据序列进行了幅度加权,因此,在本步骤中,直接将各个RAKE接收支路输出的数据序列相加,实质上就实现了所谓的最大比合并。理论上可以证明,将各路多径信号进行最大比合并可以获得最佳的接收性能。Since, in the channel correction process described in the above step B, the data sequence output by each RAKE receiving branch has been amplitude weighted according to the magnitude of the channel fading factor of each RAKE receiving branch, therefore, in this step, The data sequence output by each RAKE receiving branch is directly added, and the so-called maximum ratio combination is realized in essence. Theoretically, it can be proved that the best receiving performance can be obtained by combining the multipath signals of each path with the maximum ratio.

从上述RAKE接收过程可以看出,为了实现准确的RAKE接收,每个RAKE接收支路信道估计的准确性是至关重要的。一般情况下,RAKE接收可以利用下行导频信号进行信道估计,其原因是:下行导频信号的功率相对比较强,并且下行导频信号的符号序列对移动终端来讲是已知的,可以做较长时间的相干处理,因而可以提高信道估计的准确性。下行导频信号分为公共导频信号和专用导频信号两种,其中,专用导频信号的功率相对较弱,且是非连续发射的,而公共导频信号的功率相对较强,例如,通常占小区最大发射功率的10%,而且是连续发射的,因此,相比较而言,使用公共导频信号可以进行更长时间的相干接收,实现更精确的信道估计,因此,传统的RAKE接收方法一般都采用公共导频信号进行多径信号的信道估计。It can be seen from the above RAKE receiving process that in order to realize accurate RAKE receiving, the accuracy of channel estimation of each RAKE receiving branch is crucial. In general, RAKE reception can use the downlink pilot signal for channel estimation. The reason is that the power of the downlink pilot signal is relatively strong, and the symbol sequence of the downlink pilot signal is known to the mobile terminal, so it can be done Longer time coherent processing, thus improving the accuracy of channel estimation. Downlink pilot signals are divided into public pilot signals and dedicated pilot signals. Among them, the power of dedicated pilot signals is relatively weak and is transmitted discontinuously, while the power of public pilot signals is relatively strong. For example, usually It accounts for 10% of the maximum transmission power of the cell, and it is transmitted continuously. Therefore, in comparison, the use of common pilot signals can perform coherent reception for a longer time and achieve more accurate channel estimation. Therefore, the traditional RAKE reception method Generally, common pilot signals are used for channel estimation of multipath signals.

图1(a)显示了使用上述RAKE接收方法的RAKE接收机。如图1(a)所示,现有移动终端的RAKE接收机主要包括:一个以上小区RAKE接收模块,例如N个小区RAKE接收模块,N为大于1的自然数,以及信号合并器。其中,所述小区RAKE接收模块用于从接收的数字采样信号中区分出本小区的多径信号,并对本小区的多径信号进行RAKE接收,得到本小区各个RAKE接收支路输出的数据序列,并输出到所述信号合并器中;所述信号合并器用于将来自所有小区RAKE接收模块的各个RAKE接收支路输出的数据序列合并,得到该移动终端的接收序列。Fig. 1(a) shows a RAKE receiver using the above RAKE reception method. As shown in Fig. 1(a), the RAKE receiver of the existing mobile terminal mainly includes: more than one cell RAKE receiving modules, for example, N cell RAKE receiving modules, where N is a natural number greater than 1, and a signal combiner. Wherein, the cell RAKE receiving module is used to distinguish the multipath signal of the cell from the received digital sampling signal, and perform RAKE reception on the multipath signal of the cell to obtain the data sequence output by each RAKE receiving branch of the cell, and output to the signal combiner; the signal combiner is used to combine the data sequences output from each RAKE receiving branch of the RAKE receiving module of all cells to obtain the receiving sequence of the mobile terminal.

图1(b)显示了上述RAKE接收机中小区RAKE接收模块的内部结构。如图1(b)所示,所述小区RAKE接收模块进一步包括:多径搜索器及一个以上的RAKE接收支路,例如M个RAKE接收支路,M为大于1的自然数。其中,所述多径搜索器用于从数字采样信号中搜索本小区内各个多径信号的多径时延,并将搜索到的多径时延分别输出到所述一个以上的RAKE接收支路中;所述RAKE接收支路根据接收到的多径时延,以及输入的数字采样信号,分别对各个RAKE接收支路的信号进行解调,得到各个RAKE接收支路输出的数据序列,并输出到所述信号合并器进行信号合并。Fig. 1(b) shows the internal structure of the cell RAKE receiving module in the above RAKE receiver. As shown in FIG. 1(b), the cell RAKE receiving module further includes: a multipath searcher and more than one RAKE receiving branch, for example, M RAKE receiving branches, where M is a natural number greater than 1. Wherein, the multipath searcher is used to search the multipath time delay of each multipath signal in the cell from the digital sampling signal, and output the searched multipath time delay to the above one or more RAKE receiving branches respectively ; The RAKE receiving branch demodulates the signals of each RAKE receiving branch according to the received multipath time delay and the input digital sampling signal to obtain the data sequence output by each RAKE receiving branch, and output to The signal combiner performs signal combination.

图1(c)显示了上述RAKE接收支路的内部结构。如图1(c)所示,所述RAKE接收支路包括专用信道解扩单元、公共导频解扩单元、信道估计单元以及信道纠偏单元。其中,所述专用信道解扩单元采用专用信道的信道码和本小区扰码,对输入的数字采样信号进行解扩,获得本RAKE接收支路信号在专用信道上承载的专用数据序列,然后将解扩后的数据序列输出到所述信道纠偏单元中;所述公共导频解扩单元采用公共导频信道的信道码和本小区扰码,对输入的数字采样信号进行解扩,然后将解扩后的公共导频信号输出的到所述信道估计单元;所述信道估计单元用于根据接收的公共导频信号对本RAKE接收支路进行信道估计,得到本支路的信道衰落因子,包括幅度因子和相位因子,输出到所述信道纠偏单元;所述的信道纠偏单元根据本RAKE接收支路的衰落因子,根据其中的相位因子纠正本RAKE接收支路输出数据序列的相位,同时,根据其中的幅度因子对本RAKE接收支路输出的数据序列进行幅度加权。Figure 1(c) shows the internal structure of the above RAKE receiving branch. As shown in Fig. 1(c), the RAKE receiving branch includes a dedicated channel despreading unit, a common pilot despreading unit, a channel estimation unit and a channel correction unit. Wherein, the dedicated channel despreading unit uses the channel code of the dedicated channel and the scrambling code of the local cell to despread the input digital sampling signal to obtain the dedicated data sequence carried by the RAKE receiving branch signal on the dedicated channel, and then The despread data sequence is output to the channel correction unit; the common pilot despreading unit uses the channel code of the common pilot channel and the scrambling code of this cell to despread the input digital sampling signal, and then despread the despreading unit The expanded common pilot signal is output to the channel estimation unit; the channel estimation unit is used to perform channel estimation on the RAKE receiving branch according to the received common pilot signal, and obtain the channel fading factor of the branch, including the amplitude Factor and phase factor are output to the channel correction unit; the channel correction unit corrects the phase of the output data sequence of the RAKE receiving branch according to the phase factor in it according to the fading factor of the RAKE receiving branch, and at the same time, according to the fading factor of the RAKE receiving branch. The amplitude factor of this RAKE performs amplitude weighting on the data sequence output by the receiving branch of this RAKE.

从上述现有的移动终端RAKE接收方法和图1所示的RAKE接收机可以看出,在非软切换场景中,由于移动终端只接收服务小区的信号,每个RAKE接收支路都利用服务小区的公共导频信号进行信道估计,此时,各个RAKE接收支路所接收的公共导频信号强度可以真实地反映各个RAKE接收支路多径信号的相对信号强度,因此,在数据接收过程中,使用公共导频信号的信道衰落因子的幅度因子对各个RAKE接收支路的数据序列进行加权,然后再相加,实质上相当于实现了最大比合并,从而可以得到良好的接收性能。It can be seen from the above-mentioned existing mobile terminal RAKE receiving method and the RAKE receiver shown in Figure 1 that in a non-soft handover scenario, since the mobile terminal only receives the signal of the serving cell, each RAKE receiving branch uses the signal of the serving cell At this time, the common pilot signal strength received by each RAKE receiving branch can truly reflect the relative signal strength of the multipath signal of each RAKE receiving branch. Therefore, in the data receiving process, The data sequence of each RAKE receiving branch is weighted by using the magnitude factor of the channel fading factor of the common pilot signal, and then added, which is equivalent to realizing the maximum ratio combination in essence, so that good receiving performance can be obtained.

但是,在软切换场景中,移动终端需要同时接收多个小区的下行信号,并对不同小区的接收信号进行合并。此时,由于每个小区不对自身的公共导频信号进行功率控制,因此,其信号强度与移动终端无关,也就是说,移动终端在各个RAKE接收支路所接收的不同小区的公共导频信号强度的强弱关系不能真实反映移动终端与各个小区之间各路多径信号的强弱关系。这样,在对各路多径信号进行幅度加权时所使用的信道衰落因子中幅度因子的大小,也不能真实反映各个小区与移动终端之间多径信号的强弱关系,因此,这种加权以及后续的合并过程不能实现各个多径信号的最大比合并,从而导致接收性能的恶化。However, in a soft handover scenario, the mobile terminal needs to simultaneously receive downlink signals of multiple cells and combine the received signals of different cells. At this time, since each cell does not perform power control on its own common pilot signal, its signal strength has nothing to do with the mobile terminal, that is, the common pilot signals of different cells received by the mobile terminal in each RAKE receiving branch The strength relationship cannot truly reflect the strength relationship of each multipath signal between the mobile terminal and each cell. In this way, the magnitude of the amplitude factor in the channel fading factor used when performing amplitude weighting on each multipath signal cannot truly reflect the strength relationship between the multipath signals between each cell and the mobile terminal. Therefore, this weighting and The subsequent combination process cannot realize the maximum ratio combination of each multipath signal, which leads to the deterioration of the receiving performance.

发明内容 Contents of the invention

为了解决上述技术问题,本发明提供了一种移动终端采用的RAKE接收方法,可以同时应用于软切换和非软切换的情况下,实现多径信号解调后的最大比合并,提高移动终端的接收性能。In order to solve the above-mentioned technical problems, the present invention provides a RAKE receiving method adopted by a mobile terminal, which can be applied to soft handover and non-soft handover at the same time, realizes maximum ratio combining after multipath signal demodulation, and improves mobile terminal performance. Receive performance.

本发明还提供了一种移动终端的RAKE接收机,可以同时应用于软切换和非软切换的情况下,能够实现多径信号解调后的最大比合并,提高移动终端的接收性能。The present invention also provides a RAKE receiver for a mobile terminal, which can be applied to both soft handover and non-soft handover, can realize maximum ratio combining after multipath signal demodulation, and improve the receiving performance of the mobile terminal.

本发明所述移动终端采用的RAKE接收方法,包括:The RAKE receiving method adopted by the mobile terminal of the present invention includes:

a、采用不同小区的扰码和公共导频符号序列对接收的数字采样信号进行多径搜索,得到每个小区内各路多径信号的多径时延;a. Using the scrambling codes and common pilot symbol sequences of different cells to perform multipath search on the received digital sampling signal, and obtain the multipath time delay of each multipath signal in each cell;

b、对应每个小区内的各路多径信号,根据搜索得到的各路多径信号的多径时延,使用多个RAKE接收支路分别对各路多径信号进行解扩、信道估计和信道纠偏处理,得到各个RAKE接收支路的输出数据序列;b. Corresponding to each multipath signal in each cell, according to the multipath time delay of each multipath signal obtained by searching, use multiple RAKE receiving branches to perform despreading, channel estimation and summing on each multipath signal respectively Channel correction processing to obtain the output data sequence of each RAKE receiving branch;

在所述信道估计中,每个瑞克接收支路根据本支路的下行公共导频信号进行相位估计,根据本支路的下行专用导频信号进行幅度估计;In the channel estimation, each rake receiving branch performs phase estimation according to the downlink common pilot signal of the branch, and performs amplitude estimation according to the downlink dedicated pilot signal of the branch;

c、将各个RAKE接收支路的输出数据序列进行合并,得到移动终端的接收信号。c. Combining output data sequences of each RAKE receiving branch to obtain a receiving signal of the mobile terminal.

步骤b所述的信道估计包括:The channel estimation described in step b includes:

每个RAKE接收支路,分别采用本RAKE接收支路的下行公共导频信号进行信道的相位估计,得到相位因子;Each RAKE receiving branch uses the downlink common pilot signal of the RAKE receiving branch to estimate the phase of the channel to obtain the phase factor;

在本RAKE接收支路的多径信号中提取下行专用导频信号,采用所述下行专用导频信号进行幅度估计,得到幅度因子;Extract the downlink dedicated pilot signal from the multipath signal of the RAKE receiving branch, and use the downlink dedicated pilot signal to perform amplitude estimation to obtain the amplitude factor;

将所述相位因子和幅度因子相乘,得到本RAKE接收支路的信道衰落因子。Multiply the phase factor and amplitude factor to obtain the channel fading factor of the RAKE receiving branch.

本发明所述相位估计包括:根据预先配置的下行公共导频符号序列,对从本RAKE接收支路接收的下行公共导频信号进行相干解调,得到本RAKE接收支路多径信号的信道衰落因子,包括幅度因子和相位因子,保留其中的相位因子。The phase estimation in the present invention includes: performing coherent demodulation on the downlink common pilot signal received from the RAKE receiving branch according to the pre-configured downlink common pilot symbol sequence, and obtaining the channel fading of the multipath signal of the RAKE receiving branch Factors, including magnitude factor and phase factor, retain the phase factor.

本发明所述相干解调为:对一个时隙内符号序列进行相干解调,或对多个时隙内的符号序列进行相干解调。The coherent demodulation in the present invention is: performing coherent demodulation on symbol sequences in one time slot, or performing coherent demodulation on symbol sequences in multiple time slots.

步骤b所述的幅度估计包括:The amplitude estimation described in step b includes:

b11、根据下行时隙格式确定本RAKE接收支路下行专用导频信号在每个时隙中的位置和数目;b11. Determine the position and number of downlink dedicated pilot signals of the RAKE receiving branch in each time slot according to the downlink time slot format;

b12、根据确定的位置和数目从接收的每个时隙的数据序列中提取该时隙的下行专用导频信号;b12. Extracting the downlink dedicated pilot signal of the time slot from the received data sequence of each time slot according to the determined position and number;

b13、将提取的下行专用导频信号与预先配置的在该时隙内的下行专用导频符号序列进行相干解调,得到该时隙多径信号的信道衰落因子,包括幅度因子和相位因子,保留其中的幅度因子。b13. Perform coherent demodulation of the extracted downlink dedicated pilot signal and the preconfigured downlink dedicated pilot symbol sequence in the time slot to obtain the channel fading factor of the multipath signal in the time slot, including an amplitude factor and a phase factor, The magnitude factor in it is preserved.

本发明所述幅度估计进一步包括:The amplitude estimation of the present invention further includes:

b14、对连续多个时隙的幅度因子进行平均或者滤波处理,得到本RAKE接收支路的平均幅度因子。b14. Average or filter the magnitude factors of multiple consecutive time slots to obtain the average magnitude factor of the RAKE receiving branch.

步骤b所述的信道纠偏包括:The channel correction described in step b includes:

b21、对信道估计得到的信道衰落因子取共轭;b21. Conjugate the channel fading factor obtained by channel estimation;

b22、将取共轭后的信道衰落因子与解扩后的数据序列进行乘积运算。b22. Perform a product operation on the conjugated channel fading factor and the despread data sequence.

步骤c所述的合并为:将每个RAKE接收支路输出的数据序列按照无线帧和时隙位置在时间上对齐,然后按对应位相加,得到移动终端的接收数据序列。The merging described in step c is: aligning the data sequence output by each RAKE receiving branch in time according to the radio frame and time slot position, and then adding corresponding bits to obtain the received data sequence of the mobile terminal.

本发明所述应用于移动终端的RAKE接收机,包括:The RAKE receiver applied to the mobile terminal according to the present invention includes:

一个以上小区RAKE接收模块,用于从接收的数字采样信号中区分出本小区的多径信号,并进行多径接收,得到多路输出数据序列,并输出;More than one cell RAKE receiving module is used to distinguish the multipath signal of the cell from the received digital sampling signal, and perform multipath reception to obtain multiple output data sequences and output them;

以及信号合并器,用于将来自各个小区RAKE接收模块的多路输出数据序列进行合并,得到该移动终端的接收序列;And a signal combiner, which is used to combine the multiple output data sequences from the RAKE receiving modules of each cell to obtain the receiving sequence of the mobile terminal;

其中,所述小区RAKE接收模块包括:Wherein, the cell RAKE receiving module includes:

多径搜索器,用于从数字采样信号中搜索本小区中各个多径信号的多径时延,并输出到一个以上的RAKE接收支路中;The multipath searcher is used to search the multipath time delay of each multipath signal in the cell from the digital sampling signal, and output it to more than one RAKE receiving branch;

以及一个以上的RAKE接收支路,用于根据接收到的多径时延及输入的数字采样信号,分别对各个多径信号进行解调,得到该RAKE接收支路的输出数据序列,并输出到所述信号合并器;And more than one RAKE receiving branch, which is used to demodulate each multipath signal according to the received multipath time delay and the input digital sampling signal, to obtain the output data sequence of the RAKE receiving branch, and output to said signal combiner;

其中,所述RAKE接收支路包括:专用信道解扩单元、专用导频获取单元、幅度估计单元、公共导频解扩单元、相位估计单元、衰落因子产生单元以及信道纠偏单元;Wherein, the RAKE receiving branch includes: a dedicated channel despreading unit, a dedicated pilot acquisition unit, an amplitude estimation unit, a common pilot despreading unit, a phase estimation unit, a fading factor generation unit, and a channel correction unit;

所述专用信道解扩单元采用专用信道的信道码和本小区的扰码,对输入的数字采样信号进行解扩,获得本RAKE接收支路信号在专用信道上承载的数据序列,然后同时输出到所述专用导频获取单元和所述信道纠偏单元;The dedicated channel despreading unit uses the channel code of the dedicated channel and the scrambling code of the local cell to despread the input digital sampling signal, obtain the data sequence carried by the RAKE receiving branch signal on the dedicated channel, and then simultaneously output to The dedicated pilot acquisition unit and the channel correction unit;

所述专用导频获取单元用于从接收的专用信道数据序列中获取专用导频信号,并发送到所述幅度估计单元;The dedicated pilot acquisition unit is used to acquire a dedicated pilot signal from the received dedicated channel data sequence and send it to the amplitude estimation unit;

所述幅度估计单元用于对接收的专用导频信号进行幅度估计,得到本RAKE接收支路信道衰落的幅度因子,并发送到所述衰落因子产生单元;The amplitude estimating unit is used to estimate the amplitude of the received dedicated pilot signal, obtain the amplitude factor of the RAKE receiving branch channel fading, and send it to the fading factor generating unit;

所述公共导频解扩单元采用公共导频信道的信道码和本小区扰码,对输入的数字采样信号进行解扩,获得本小区的公共导频信号,然后输出的到所述相位估计单元;The common pilot despreading unit uses the channel code of the common pilot channel and the scrambling code of the local cell to despread the input digital sampling signal to obtain the common pilot signal of the local cell, and then output it to the phase estimation unit ;

所述相位估计单元用于根据公共导频解扩单元输出的公共导频信号进行相位估计,得到本RAKE接收支路信道衰落的相位因子,并发送到所述衰落因子产生单元;The phase estimation unit is used to perform phase estimation according to the common pilot signal output by the common pilot despreading unit, obtain the phase factor of the fading of the RAKE receiving branch channel, and send it to the fading factor generation unit;

所述衰落因子产生单元用于根据接收的相位因子和幅度因子计算出当前的信道衰落因子,并输出到信道纠偏单元;The fading factor generation unit is used to calculate the current channel fading factor according to the received phase factor and amplitude factor, and output it to the channel correction unit;

所述的信道纠偏单元用于根据本RAKE接收支路的衰落因子进行信道纠偏,并将纠偏后的数据序列输出到所述信号合并器。The channel correction unit is used to perform channel correction according to the fading factor of the RAKE receiving branch, and output the corrected data sequence to the signal combiner.

由此可以看出,本发明所述的RAKE接收方法及RAKE接收机一方面可以利用下行公共导频信号进行RAKE接收支路的相位估计,充分利用下行公共导频信号信号强和连续发射的特点,可以采用较长的相干长度保证RAKE接收支路相位估计的准确性,从而保证良好的信道纠偏效果,提高移动终端的接收性能;It can be seen that the RAKE receiving method and the RAKE receiver of the present invention can utilize the downlink common pilot signal to perform the phase estimation of the RAKE receiving branch on the one hand, and make full use of the strong and continuous transmission characteristics of the downlink common pilot signal , a longer coherence length can be used to ensure the accuracy of the phase estimation of the RAKE receiving branch, thereby ensuring a good channel correction effect and improving the receiving performance of the mobile terminal;

另一方面,本发明所述的RAKE接收方法和RAKE接收机利用下行专用导频进行多径信道的幅度估计,充分利用下行专用导频信号能够真实反映各个多径信号强度的特点,保证多径信道幅度估计的准确性,从而使得无论在软切换或非软切换的情况下,对RAKE接收支路的解扩信号进行幅度加权及合并的操作,实质上均实现了对移动终端的所有多径信号的最大比合并,从而使移动终端获得良好的接收性能。On the other hand, the RAKE receiving method and the RAKE receiver of the present invention use downlink dedicated pilots to estimate the amplitude of multipath channels, make full use of downlink dedicated pilots to truly reflect the characteristics of each multipath signal strength, and ensure multipath The accuracy of the channel amplitude estimation, so that whether in the case of soft handover or non-soft handover, the operation of amplitude weighting and combining of the despread signals of the RAKE receiving branch is substantially realized for all multipath signals of the mobile terminal. The maximum ratio combination of signals enables the mobile terminal to obtain good receiving performance.

附图说明 Description of drawings

图1(a)显示了现有的移动终端RAKE接收机;Figure 1(a) shows an existing mobile terminal RAKE receiver;

图1(b)显示了图1(a)所示RAKE接收机中小区RAKE接收模块的内部结构;Figure 1(b) shows the internal structure of the RAKE receiving module of the cell in the RAKE receiver shown in Figure 1(a);

图1(c)显示了图1(b)所示RAKE接收支路的内部结构;Figure 1(c) shows the internal structure of the RAKE receiving branch shown in Figure 1(b);

图2为本发明所述移动终端RAKE接收方法的流程图;Fig. 2 is the flowchart of the mobile terminal RAKE receiving method of the present invention;

图3(a)显示了本发明所述的移动终端RAKE接收机;Fig. 3 (a) has shown mobile terminal RAKE receiver of the present invention;

图3(b)显示了图3(a)所示RAKE接收机中小区RAKE接收模块的内部结构;Fig. 3 (b) has shown the internal structure of the cell RAKE receiving module in the RAKE receiver shown in Fig. 3 (a);

图3(c)显示了图3(b)所示RAKE接收支路的内部结构。Figure 3(c) shows the internal structure of the RAKE receiving branch shown in Figure 3(b).

具体实施方式 Detailed ways

下面结合附图和本发明的优选实施例详细说明本发明所述的RAKE接收方法和RAKE接收机。The RAKE receiving method and RAKE receiver described in the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments of the present invention.

考虑到现有RAKE接收方法应用在软切换情况下出现接收性能恶化的根本原因在于:移动终端所接收的不同小区的下行公共导频信号强度之间的强弱关系不能真实反映各个小区与该移动终端之间多径信号之间的强弱关系,使得在对各路多径信号进行幅度加权时所使用的衰落因子中幅度因子的大小也不能真实的反映各个多径信号的强度之间的强弱关系,从而移动终端无法实现对各路多径信号专用信道上承载的数据进行理想的最大比合并,导致接收性能的恶化。Considering that the existing RAKE receiving method is applied in the case of soft handover, the root cause of the deterioration of receiving performance is that the strength relationship between the downlink common pilot signal strengths of different cells received by the mobile terminal cannot truly reflect the relationship between each cell and the mobile terminal. The strength relationship between multipath signals between terminals makes the magnitude of the amplitude factor in the fading factor used when weighting the amplitude of each multipath signal cannot truly reflect the strength of each multipath signal. Therefore, the mobile terminal cannot realize the ideal maximum ratio combination of the data carried on the dedicated channel of each multipath signal, resulting in the deterioration of the receiving performance.

熟悉本领域的技术人员可以理解,由于下行专用导频信号的发射功率与用户的专用信道信号的发射功率成比例,并且都受到相同功率控制的影响,可以真实反映各个小区与移动终端之间各路多径信号的强度,因此,可以充分利用移动终端在各个RAKE接收支路上所接收的下行专用导频信号进行信道估计,准确获得各个RAKE接收支路的幅度因子。Those skilled in the art can understand that since the transmission power of the downlink dedicated pilot signal is proportional to the transmission power of the user's dedicated channel signal, and both are affected by the same power control, it can truly reflect the differences between each cell and the mobile terminal. Therefore, the downlink dedicated pilot signal received by the mobile terminal on each RAKE receiving branch can be fully used for channel estimation, and the amplitude factor of each RAKE receiving branch can be accurately obtained.

基于以上内容,本发明提供了一种RAKE接收方法,其主要思想是:对于每个小区的每一个RAKE接收支路,使用该小区使用的下行公共导频信号进行信道的相位估计,得到相位因子,并从该支路多径信号中提取下行专用导频信号,进行幅度估计,得到幅度因子,再用估计得到的相位因子和幅度因子进行信道纠偏,得到该RAKE接收支路输出的数据序列,然后将所有小区的所有RAKE接收支路输出的数据序列进行合并,得到移动终端的接收数据序列。Based on the above, the present invention provides a RAKE receiving method, the main idea of which is: for each RAKE receiving branch of each cell, use the downlink common pilot signal used by the cell to perform channel phase estimation to obtain the phase factor , and extract the downlink dedicated pilot signal from the branch multipath signal, perform amplitude estimation to obtain the amplitude factor, and then use the estimated phase factor and amplitude factor to perform channel correction to obtain the data sequence output by the RAKE receiving branch, Then, the data sequences output by all the RAKE receiving branches of all the cells are combined to obtain the received data sequence of the mobile terminal.

图2显示了本发明所述的移动终端所采用的RAKE接收方法。如图2所示,该方法主要包括以下步骤:Fig. 2 shows the RAKE receiving method adopted by the mobile terminal of the present invention. As shown in Figure 2, the method mainly includes the following steps:

a、采用不同小区的扰码和公共导频符号序列对接收的数字采样信号进行多径搜索,得到每个小区内各路多径信号的多径时延。a. Using the scrambling codes and common pilot symbol sequences of different cells to perform multipath search on the received digital sampling signals, and obtain the multipath time delay of each multipath signal in each cell.

b、对应每个小区的各路多径信号,根据搜索得到的各路多径信号的多径时延,使用多个RAKE接收支路分别对各路多径信号顺序执行解扩、信道估计和信道纠偏处理,得到各个RAKE接收支路的输出数据序列;b. Corresponding to each multipath signal of each cell, according to the multipath time delay of each multipath signal obtained by searching, use multiple RAKE receiving branches to sequentially perform despreading, channel estimation and Channel correction processing to obtain the output data sequence of each RAKE receiving branch;

其中,每个RAKE接收支路根据本支路的下行公共导频信号和下行专用导频信号对本支路上的多径信号执行信道估计。Wherein, each RAKE receiving branch performs channel estimation on the multipath signal on the branch according to the common downlink pilot signal and the dedicated downlink pilot signal of the branch.

所述的信道估计包括:在每个RAKE接收支路中,采用本RAKE接收支路的下行公共导频信号进行信道的相位估计,得到相位因子,并在本支路的多径信号中提取下行专用导频信号进行幅度估计得到幅度因子,综合所述相位因子和幅度因子得到本RAKE接收支路的信道衰落因子。The channel estimation includes: in each RAKE receiving branch, use the downlink common pilot signal of this RAKE receiving branch to perform channel phase estimation, obtain the phase factor, and extract the downlink from the multipath signal of this branch Estimate the amplitude of the dedicated pilot signal to obtain the amplitude factor, and combine the phase factor and the amplitude factor to obtain the channel fading factor of the RAKE receiving branch.

上述相位估计具体为:根据预先配置的下行公共导频符号序列,对从本RAKE接收支路接收的下行公共导频信号进行相干解调,得到本支路多径信号的信道衰落因子,包括幅度因子和相位因子e,取其中的相位因子e。其中,所述相干解调可以是对一个时隙的符号序列进行相干解调,也可以对多个时隙的符号序列进行相干解调。The above phase estimation is specifically as follows: according to the pre-configured downlink common pilot symbol sequence, coherently demodulate the downlink common pilot signal received from the RAKE receiving branch to obtain the channel fading factor of the multipath signal of the branch, including the amplitude factor and phase factor e , take the phase factor e among them. Wherein, the coherent demodulation may be to perform coherent demodulation on the symbol sequence of one time slot, or to perform coherent demodulation on the symbol sequence of multiple time slots.

上述幅度估计具体为:根据下行时隙格式确定下行专用导频信号在每个时隙中的位置和数目,从接收的每个时隙的数据序列中提取该时隙的下行专用导频信号,然后和预先配置的该时隙的下行专用导频符号序列进行相干解调,得到该时隙多径信号的信道估计,即信道衰落因子,包括幅度因子A和相位因子,并取其中的幅度因子A。在上述信道估计过程中,可以对连续多个时隙的幅度因子进行平均或者滤波,得到该RAKE接收支路的平均幅度因子。The above amplitude estimation specifically includes: determining the position and number of downlink dedicated pilot signals in each time slot according to the downlink time slot format, extracting the downlink dedicated pilot signals of the time slot from the received data sequence of each time slot, Then perform coherent demodulation with the pre-configured downlink dedicated pilot symbol sequence of the time slot to obtain the channel estimation of the multipath signal of the time slot, that is, the channel fading factor, including the amplitude factor A and the phase factor, and take the amplitude factor a. In the above channel estimation process, the amplitude factors of multiple consecutive time slots may be averaged or filtered to obtain the average amplitude factor of the RAKE receiving branch.

本步骤所述信道纠偏的具体方法与现有技术的方法基本相同,包括:首先,用相位估计过程得到的相位因子e以及幅度估计过程得到的幅度因子A相乘计算出该RAKE接收支路的信道衰落因子Ae,再对信道衰落因子取共轭,然后将取共轭后的信道衰落因子与解扩后的数据序列进行乘积运算。The specific method of channel correction described in this step is basically the same as the method in the prior art, including: first, multiplying the phase factor e obtained by the phase estimation process and the amplitude factor A obtained by the amplitude estimation process to calculate the RAKE receiving branch Then the channel fading factor Ae is conjugated, and then the product operation is performed on the conjugated channel fading factor and the despread data sequence.

上述信道纠偏处理对各个RAKE接收支路输出数据序列进行了相位调整和幅度加权。The above-mentioned channel correction process performs phase adjustment and amplitude weighting on the output data sequence of each RAKE receiving branch.

c、在信道纠偏后,将各个RAKE接收支路输出的数据序列进行合并,得到移动终端的接收信号。c. After channel correction, the data sequences output by each RAKE receiving branch are combined to obtain a received signal of the mobile terminal.

本步骤所述的合并具体为:将每个RAKE接收支路输出的数据序列按照无线帧和时隙位置在时间上对齐,然后按对应位相加,得到移动终端的接收数据序列。The merging described in this step is specifically: aligning the data sequence output by each RAKE receiving branch in time according to the radio frame and time slot position, and then adding corresponding bits to obtain the received data sequence of the mobile terminal.

由于在上述信道估计过程中是利用各个RAKE接收支路的下行专用导频信号进行幅度估计的,因此,各个RAKE接收支路信道衰落因子中幅度因子的大小关系可以真实反映各路多径信号之间的强弱关系,从而上述对各路多径信号进行幅度加权以及合并的过程,就相当于实现了对各个小区的各路多径信号进行最大比合并,因此,可以保证良好的接收性能。In the above channel estimation process, the downlink dedicated pilot signals of each RAKE receiving branch are used for amplitude estimation, therefore, the magnitude relationship of the amplitude factors in the channel fading factors of each RAKE receiving branch can truly reflect the relationship between the multipath signals of each path. Therefore, the above-mentioned process of amplitude weighting and combining the multipath signals of each path is equivalent to realizing the maximum ratio combination of the multipath signals of each cell, so good receiving performance can be guaranteed.

本发明还提供了一种应用上述RAKE接收方法进行RAKE接收的移动终端RAKE接收机。The present invention also provides a mobile terminal RAKE receiver for RAKE reception using the above RAKE reception method.

图3(a)显示了本发明所述RAKE接收机的结构。如图3(a)所示,所述的RAKE接收机主要包括:一个以上小区RAKE接收模块,例如N个小区RAKE接收模块,N为大于1的自然数,以及信号合并器。其中,所述的小区RAKE接收模块用于从接收的数字采样信号从区分出本小区的多径信号,并进行多径接收,得到多路输出数据序列,并输出到所述信号合并器中;所述信号合并器将来自各个小区RAKE接收模块的多路输出数据序列进行合并,得到该移动终端的接收序列。Fig. 3(a) shows the structure of the RAKE receiver of the present invention. As shown in Figure 3(a), the RAKE receiver mainly includes: more than one cell RAKE receiving modules, such as N cell RAKE receiving modules, where N is a natural number greater than 1, and a signal combiner. Wherein, the cell RAKE receiving module is used to distinguish the multi-path signal of the cell from the received digital sampling signal, and perform multi-path reception to obtain a multi-channel output data sequence, and output it to the signal combiner; The signal combiner combines the multiple output data sequences from the RAKE receiving modules of each cell to obtain the receiving sequence of the mobile terminal.

图3(b)显示了上述RAKE接收机中小区RAKE接收模块的内部结构。如图3(b)所示,所述小区RAKE接收模块进一步包括:多径搜索器以及一个以上的RAKE接收支路,例如M个RAKE接收支路,M为大于1的自然数。其中,所述多径搜索器用于从数字采样信号中搜索本小区中各个多径信号的多径时延,并将搜索到的多径时延分别输出到所述一个以上的RAKE接收支路中;所述RAKE接收支路根据接收到的多径时延,以及输入的数字采样信号,分别对各个多径信号进行解调,得到该RAKE接收支路的输出数据序列,并输出到所述信号合并器。Fig. 3(b) shows the internal structure of the cell RAKE receiving module in the above RAKE receiver. As shown in FIG. 3(b), the cell RAKE receiving module further includes: a multipath searcher and more than one RAKE receiving branch, for example, M RAKE receiving branches, where M is a natural number greater than 1. Wherein, the multipath searcher is used to search the multipath time delay of each multipath signal in the cell from the digital sampling signal, and output the searched multipath time delay to the above one or more RAKE receiving branches respectively ; The RAKE receiving branch demodulates each multipath signal according to the received multipath time delay and the input digital sampling signal, obtains the output data sequence of the RAKE receiving branch, and outputs it to the signal Combiner.

图3(c)显示了上述RAKE接收支路的内部结构。如图3(c)所示,所述RAKE接收支路包括专用信道解扩单元、专用导频获取单元、幅度估计单元、公共导频解扩单元、相位估计单元、衰落因子产生单元以及信道纠偏单元。Figure 3(c) shows the internal structure of the above RAKE receiving branch. As shown in Figure 3(c), the RAKE receiving branch includes a dedicated channel despreading unit, a dedicated pilot acquisition unit, an amplitude estimation unit, a common pilot despreading unit, a phase estimation unit, a fading factor generation unit, and a channel correction unit.

其中,所述专用信道解扩单元采用专用信道的信道码和本小区的扰码,对输入的数字采样信号进行解扩,获得本RAKE接收支路信号在专用信道上承载的数据序列,然后将解扩后的数据序列同时输出到所述专用导频获取单元和所述信道纠偏单元;Wherein, the dedicated channel despreading unit uses the channel code of the dedicated channel and the scrambling code of the local cell to despread the input digital sampling signal to obtain the data sequence carried by the RAKE receiving branch signal on the dedicated channel, and then The despread data sequence is simultaneously output to the dedicated pilot acquisition unit and the channel correction unit;

所述专用导频获取单元用于从接收的专用信道数据序列中获取专用导频信号,并将获取的专用导频信号发送到所述幅度估计单元;The dedicated pilot acquisition unit is used to acquire a dedicated pilot signal from the received dedicated channel data sequence, and send the acquired dedicated pilot signal to the amplitude estimation unit;

所述幅度估计单元用于对接收的专用导频信号进行幅度估计,得到本RAKE接收支路信道衰落因子的幅度因子,并将所述幅度因子发送到所述衰落因子产生单元;The amplitude estimation unit is used to estimate the amplitude of the received dedicated pilot signal, obtain the amplitude factor of the fading factor of the RAKE receiving branch channel, and send the amplitude factor to the fading factor generation unit;

所述公共导频解扩单元采公共导频信道的信道码和本小区的扰码对输入的数字采样信号进行解扩,获得本小区的公共导频信号,然后将公共导频信号输出的到所述相位估计单元;The common pilot despreading unit adopts the channel code of the common pilot channel and the scrambling code of the local community to despread the input digital sampling signal to obtain the common pilot signal of the local community, and then outputs the common pilot signal to the phase estimation unit;

所述相位估计单元用于根据公共导频解扩单元输出的公共导频信号进行相位估计,得到本RAKE接收支路的相位因子,并将所述相位因子发送到所述衰落因子产生单元;The phase estimation unit is used to perform phase estimation according to the common pilot signal output by the common pilot despreading unit, obtain the phase factor of the RAKE receiving branch, and send the phase factor to the fading factor generation unit;

所述衰落因子产生单元,根据接收的相位因子和幅度因子计算出当前的信道衰落因子,并输出到信道纠偏单元;The fading factor generation unit calculates the current channel fading factor according to the received phase factor and amplitude factor, and outputs it to the channel correction unit;

所述的信道纠偏单元用于根据本RAKE接收支路的衰落因子进行信道纠偏,在纠正本RAKE接收支路输出数据序列的相位的同时,对本RAKE接收支路输出的数据序列进行幅度加权,然后输出到所述信号合并器。The channel correction unit is used to perform channel correction according to the fading factor of the RAKE receiving branch, while correcting the phase of the output data sequence of the RAKE receiving branch, performing amplitude weighting on the data sequence output by the RAKE receiving branch, and then output to the signal combiner.

由此可以看出,本发明所述的RAKE接收方法和RAKE接收机一方面利用各个小区的下行公共导频信号进行各路多径信号的相位估计,另一方面,本发明所述的RAKE接收方法和RAKE接收机利用各路多径信号中下行专用导频进行各路多径信号的幅度估计,充分利用下行公共导频信号及下行专用导频信号的特点,保证多径信号相位估计和幅度估计的准确性,从而克服了传统RAKE接收方法以及RAKE接收机在软切换情况下的缺陷,实现了软切换情况下的各个小区多径信号的最大比合并,因此具有更好的接收性能。It can be seen that, on the one hand, the RAKE receiving method and the RAKE receiver of the present invention use the downlink common pilot signals of each cell to perform phase estimation of each multipath signal; on the other hand, the RAKE receiving method described in the present invention The method and the RAKE receiver use the downlink dedicated pilots in each multipath signal to estimate the amplitude of each multipath signal, make full use of the characteristics of the downlink common pilot signal and the downlink dedicated pilot signal, and ensure the phase estimation and amplitude of the multipath signal The estimation accuracy overcomes the shortcomings of the traditional RAKE receiving method and the RAKE receiver in the case of soft handover, and realizes the maximum ratio combination of the multipath signals of each cell in the case of soft handover, so it has better receiving performance.

需要说明的是,本发明所述RAKE接收方法及RAKE接收机可以适用于码分多址系统、宽带码分多址系统及时分双工同步码分多址系统等等无线通信系统。It should be noted that the RAKE receiving method and RAKE receiver described in the present invention can be applied to wireless communication systems such as code division multiple access system, wideband code division multiple access system and time division duplex synchronous code division multiple access system.

Claims (9)

1、一种移动终端采用的瑞克接收方法,其特征在于,所述方法包括:1. A RAKE receiving method adopted by a mobile terminal, characterized in that the method comprises: a、采用不同小区的扰码和公共导频符号序列对接收的数字采样信号进行多径搜索,得到每个小区内各路多径信号的多径时延;a. Using the scrambling codes and common pilot symbol sequences of different cells to perform multipath search on the received digital sampling signal, and obtain the multipath time delay of each multipath signal in each cell; b、对应每个小区内的各路多径信号,根据搜索得到的各路多径信号的多径时延,使用多个瑞克接收支路分别对各路多径信号进行解扩、信道估计和信道纠偏处理,得到各个瑞克接收支路的输出数据序列;b. Corresponding to each multipath signal in each cell, according to the multipath time delay of each multipath signal obtained by searching, use multiple rake receiving branches to respectively despread and channel estimate each multipath signal and channel correction processing to obtain the output data sequence of each rake receiving branch; 在所述信道估计中,每个瑞克接收支路根据本支路的下行公共导频信号进行相位估计,根据本支路的下行专用导频信号进行幅度估计;In the channel estimation, each rake receiving branch performs phase estimation according to the downlink common pilot signal of the branch, and performs amplitude estimation according to the downlink dedicated pilot signal of the branch; c、将各个瑞克接收支路的输出数据序列进行合并,得到移动终端的接收信号。c. Combining the output data sequences of each rake receiving branch to obtain a receiving signal of the mobile terminal. 2、如权利要求1所述的方法,其特征在于,步骤b所述的信道估计包括:2. The method according to claim 1, wherein the channel estimation in step b comprises: 每个瑞克接收支路,分别采用本RAKE接收支路的下行公共导频信号进行信道的相位估计,得到相位因子;Each RAKE receiving branch uses the downlink common pilot signal of the RAKE receiving branch to perform channel phase estimation to obtain the phase factor; 在本瑞克接收支路的多径信号中提取下行专用导频信号,采用所述下行专用导频信号进行幅度估计,得到幅度因子;Extracting the downlink dedicated pilot signal from the multipath signal of the Benruike receiving branch, using the downlink dedicated pilot signal to perform amplitude estimation to obtain the amplitude factor; 将所述相位因子和幅度因子相乘,得到本瑞克接收支路的信道衰落因子。Multiply the phase factor and amplitude factor to obtain the channel fading factor of the Benreck receiving branch. 3、如权利要求2所述的方法,其特征在于,所述相位估计包括:根据预先配置的下行公共导频符号序列,对从本瑞克接收支路接收的下行公共导频信号进行相干解调,得到本瑞克接收支路多径信号的信道衰落因子,包括幅度因子和相位因子,保留其中的相位因子。3. The method according to claim 2, wherein the phase estimation comprises: performing coherent solution to the downlink common pilot signal received from the Benrek receiving branch according to the pre-configured downlink common pilot symbol sequence To get the channel fading factor of the multipath signal of Benreck receiving branch, including the amplitude factor and phase factor, and keep the phase factor. 4、如权利要求3所述的方法,其特征在于,所述相干解调为:对一个时隙内符号序列进行相干解调,或对多个时隙内的符号序列进行相干解调。4. The method according to claim 3, wherein the coherent demodulation is: performing coherent demodulation on symbol sequences in one time slot, or performing coherent demodulation on symbol sequences in multiple time slots. 5、如权利要求2所述的方法,其特征在于,步骤b所述的幅度估计包括:5. The method according to claim 2, wherein the amplitude estimation in step b comprises: b11、根据下行时隙格式确定本瑞克接收支路下行专用导频信号在每个时隙中的位置和数目;b11. Determine the position and number of downlink dedicated pilot signals in each time slot of the Benrik receiving branch according to the downlink time slot format; b12、根据确定的位置和数目从接收的每个时隙的数据序列中提取该时隙的下行专用导频信号;b12. Extracting the downlink dedicated pilot signal of the time slot from the received data sequence of each time slot according to the determined position and number; b13、将提取的下行专用导频信号与预先配置的在该时隙内的下行专用导频符号序列进行相干解调,得到该时隙多径信号的信道衰落因子,包括幅度因子和相位因子,保留其中的幅度因子。b13. Coherently demodulate the extracted downlink dedicated pilot signal and the pre-configured downlink dedicated pilot symbol sequence in the time slot to obtain the channel fading factor of the multipath signal in the time slot, including amplitude factor and phase factor, The magnitude factor in it is preserved. 6、如权利要求5所述的方法,其特征在于,所述幅度估计进一步包括:6. The method of claim 5, wherein said amplitude estimation further comprises: b14、对连续多个时隙的幅度因子进行平均或者滤波处理,得到本瑞克接收支路的平均幅度因子。b14. Average or filter the magnitude factors of multiple consecutive time slots to obtain the average magnitude factor of the Benrek receiving branch. 7、如权利要求1所述的方法,其特征在于,步骤b所述的信道纠偏包括:7. The method according to claim 1, wherein the channel correction in step b comprises: b21、对信道估计得到的信道衰落因子取共轭;b21. Conjugate the channel fading factor obtained by channel estimation; b22、将取共轭后的信道衰落因子与解扩后的数据序列进行乘积运算。b22. Perform a product operation on the conjugated channel fading factor and the despread data sequence. 8、如权利要求1所述的方法,其特征在于,步骤c所述的合并为:将每个瑞克接收支路输出的数据序列按照无线帧和时隙位置在时间上对齐,然后按对应位相加,得到移动终端的接收数据序列。8. The method according to claim 1, wherein the merging described in step c is: aligning the data sequence output by each rake receiving branch in time according to the radio frame and time slot position, and then according to the corresponding The bits are added to obtain the received data sequence of the mobile terminal. 9、一种应用于移动终端的瑞克接收机,其特征在于,该瑞克接收机包括:9. A RAKE receiver applied to a mobile terminal, characterized in that the RAKE receiver includes: 一个以上小区瑞克接收模块,用于从接收的数字采样信号中区分出本小区的多径信号,并进行多径接收,得到多路输出数据序列,并输出;More than one cell Rake receiving module is used to distinguish the multi-path signal of the cell from the received digital sampling signal, and perform multi-path reception to obtain multiple output data sequences and output them; 以及信号合并器,用于将来自各个小区瑞克接收模块的多路输出数据序列进行合并,得到该移动终端的接收序列;And a signal combiner, which is used to combine the multiple output data sequences from the rake receiving modules of each cell to obtain the receiving sequence of the mobile terminal; 其中,所述小区瑞克接收模块包括:Wherein, the cell Rake receiving module includes: 多径搜索器,用于从数字采样信号中搜索本小区中各个多径信号的多径时延,并输出到一个以上的瑞克接收支路中;A multipath searcher is used to search the multipath time delay of each multipath signal in the cell from the digital sampling signal, and output it to more than one rake receiving branch; 以及一个以上的瑞克接收支路,用于根据接收到的多径时延及输入的数字采样信号,分别对各个多径信号进行解调,得到该瑞克接收支路的输出数据序列,并输出到所述信号合并器;and more than one rake receiving branch, for demodulating each multipath signal respectively according to the received multipath time delay and the input digital sampling signal, to obtain the output data sequence of the rake receiving branch, and output to said signal combiner; 其中,所述瑞克接收支路包括:专用信道解扩单元、专用导频获取单元、幅度估计单元、公共导频解扩单元、相位估计单元、衰落因子产生单元以及信道纠偏单元;Wherein, the rake receiving branch includes: a dedicated channel despreading unit, a dedicated pilot acquisition unit, an amplitude estimation unit, a common pilot despreading unit, a phase estimation unit, a fading factor generation unit, and a channel correction unit; 所述专用信道解扩单元采用专用信道的信道码和本小区的扰码,对输入的数字采样信号进行解扩,获得本瑞克接收支路信号在专用信道上承载的数据序列,然后同时输出到所述专用导频获取单元和所述信道纠偏单元;The dedicated channel despreading unit uses the channel code of the dedicated channel and the scrambling code of the local cell to despread the input digital sampling signal to obtain the data sequence carried by the Benrek receiving branch signal on the dedicated channel, and then simultaneously output to the dedicated pilot acquisition unit and the channel correction unit; 所述专用导频获取单元用于从接收的专用信道数据序列中获取专用导频信号,并发送到所述幅度估计单元;The dedicated pilot acquisition unit is used to acquire a dedicated pilot signal from the received dedicated channel data sequence and send it to the amplitude estimation unit; 所述幅度估计单元用于对接收的专用导频信号进行幅度估计,得到本瑞克接收支路信道衰落的幅度因子,并发送到所述衰落因子产生单元;The amplitude estimating unit is used to estimate the amplitude of the received dedicated pilot signal, obtain the amplitude factor of the channel fading of the Benrek receiving branch channel, and send it to the fading factor generating unit; 所述公共导频解扩单元采用公共导频信道的信道码和本小区扰码,对输入的数字采样信号进行解扩,获得本小区的公共导频信号,然后输出的到所述相位估计单元;The common pilot despreading unit uses the channel code of the common pilot channel and the scrambling code of the local cell to despread the input digital sampling signal to obtain the common pilot signal of the local cell, and then output it to the phase estimation unit ; 所述相位估计单元用于根据公共导频解扩单元输出的公共导频信号进行相位估计,得到本瑞克接收支路信道衰落的相位因子,并发送到所述衰落因子产生单元;The phase estimation unit is used to perform phase estimation according to the common pilot signal output by the common pilot despreading unit, to obtain the phase factor of the fading of the Benrek receiving branch channel, and send it to the fading factor generation unit; 所述衰落因子产生单元用于根据接收的相位因子和幅度因子计算出当前的信道衰落因子,并输出到信道纠偏单元;The fading factor generation unit is used to calculate the current channel fading factor according to the received phase factor and amplitude factor, and output it to the channel correction unit; 所述的信道纠偏单元用于根据本瑞克接收支路的衰落因子进行信道纠偏,并将纠偏后的数据序列输出到所述信号合并器。The channel correction unit is used for performing channel correction according to the fading factor of the Benreck receiving branch, and outputting the corrected data sequence to the signal combiner.
CNB2005100719735A 2005-05-25 2005-05-25 RAKE receiving method and RAKE receiver using the method Expired - Fee Related CN100426691C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2005100719735A CN100426691C (en) 2005-05-25 2005-05-25 RAKE receiving method and RAKE receiver using the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2005100719735A CN100426691C (en) 2005-05-25 2005-05-25 RAKE receiving method and RAKE receiver using the method

Publications (2)

Publication Number Publication Date
CN1870451A CN1870451A (en) 2006-11-29
CN100426691C true CN100426691C (en) 2008-10-15

Family

ID=37444019

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2005100719735A Expired - Fee Related CN100426691C (en) 2005-05-25 2005-05-25 RAKE receiving method and RAKE receiver using the method

Country Status (1)

Country Link
CN (1) CN100426691C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104561311B (en) * 2015-01-04 2016-08-17 北京大学第三医院 A kind of test kit of safety prediction of being born in early days from people's supplementary reproduction fetal development
CN106231643A (en) * 2016-07-14 2016-12-14 华为技术有限公司 A kind of signal combining method and wireless terminal
CN110518921B (en) * 2018-05-21 2021-05-04 北京小米松果电子有限公司 Method, apparatus and storage medium for multipath combining and electronic device
CN114221840B (en) * 2021-12-31 2023-11-24 长沙驰芯半导体科技有限公司 Ultra-wideband sparse channel estimation method in RAKE receiver

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1315792A (en) * 2000-03-30 2001-10-03 华为技术有限公司 Multi-path search method and device of CDMA communication system
WO2003073637A1 (en) * 2002-02-27 2003-09-04 Freescale Semiconductor, Inc. Channel estimation in a radio receiver
CN1503491A (en) * 2002-11-25 2004-06-09 深圳市中兴通讯股份有限公司上海第二 Smart antenna transceiver diversity method and device
WO2005006595A1 (en) * 2003-07-14 2005-01-20 Matsushita Electric Industrial Co., Ltd. Radio reception method and communication terminal device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1315792A (en) * 2000-03-30 2001-10-03 华为技术有限公司 Multi-path search method and device of CDMA communication system
WO2003073637A1 (en) * 2002-02-27 2003-09-04 Freescale Semiconductor, Inc. Channel estimation in a radio receiver
CN1503491A (en) * 2002-11-25 2004-06-09 深圳市中兴通讯股份有限公司上海第二 Smart antenna transceiver diversity method and device
WO2005006595A1 (en) * 2003-07-14 2005-01-20 Matsushita Electric Industrial Co., Ltd. Radio reception method and communication terminal device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
一种新的WCDMA下行链路信道参数估计方法. 盛彬,尤肖虎.应用科学学报,第20卷第3期. 2002 *

Also Published As

Publication number Publication date
CN1870451A (en) 2006-11-29

Similar Documents

Publication Publication Date Title
EP1166457B1 (en) Channel estimation in a cdma wireless communication system
JP4076202B2 (en) Spread spectrum signal receiver and receiving method
US8842658B2 (en) Synchronization channel interference cancellation
US7006557B2 (en) Time tracking loop for diversity pilots
KR100615511B1 (en) A channel estimating device, a CD receiving device and a CD transmitting / receiving device including the device
US7715489B2 (en) Space time transmit diversity (STTD) decoder within a HSDPA rake receiver
JP3204925B2 (en) Signal receiving apparatus in CDMA communication system
JP3967472B2 (en) CDMA receiver
JP3159378B2 (en) Spread spectrum communication system
JP2003521840A (en) Method for evaluating amplitude and phase in wireless communication system
JP2002515675A (en) Mobile station apparatus and method for receiving signal transmitted from base station
US8472410B2 (en) Rake receiver architecture within a WCDMA terminal
US20070133611A1 (en) Method and apparatus of frequency estimation for the downlink of td-scdma systems
WO2005020457A1 (en) Channel estimation in a rake receiver of a cdma communication system
US20080232438A1 (en) 2D Rake Receiver For Use in Wireless Communication Systems
US7526012B2 (en) Interference reduction apparatus and method
JP4588931B2 (en) Mobile radio terminal
CN100426691C (en) RAKE receiving method and RAKE receiver using the method
US20070189368A1 (en) Channel estimation for a high-speed data packet acess rake receiver
CN101056122B (en) A method and device for implementing rake reception of pilot in wideband code division multiple access system
JP3628247B2 (en) Signal demodulation method and receiving apparatus
GB2340354A (en) CDMA receiver where the received signals are phase adjusted/time delayed and then summed before despreading
JP3588043B2 (en) Receiver and automatic frequency control method
CN101110605A (en) A rake receiving device and method for transmitting power control data
JP3806389B2 (en) Receiver

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20081015