WO2016090818A1

WO2016090818A1 - Method and device for parsing spatial frequency block code and storage medium

Info

Publication number: WO2016090818A1
Application number: PCT/CN2015/077734
Authority: WO
Inventors: 吴昊; 王美英
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-12-11
Filing date: 2015-04-28
Publication date: 2016-06-16
Also published as: CN105743608B; CN105743608A

Abstract

Disclosed is a method for parsing a spatial frequency block code. The method comprises: determining a noise floor of each receiving antenna respectively, wherein there are at least two receiving antennas; converting a frequency domain receiving signal of the receiving antennas according to the noise floor of each of the receiving antennas; and decoding a spatial frequency block code according to the converted frequency domain receiving signal of each of the receiving antennas. Also disclosed are a device for parsing a spatial frequency block code and a storage medium.

Description

Method and device for analyzing spatial frequency block code, storage medium

Technical field

The present invention relates to the field of communications, and in particular, to a method and apparatus for parsing a spatial frequency block code, and a storage medium.

Background technique

In the wireless mobile communication system, after the signal is transmitted, various interferences are encountered in the transmission process, thereby causing signal attenuation. The diversity receiving technique is one of the technical measures that are commonly used to effectively resist fading and improve link reliability. The basic principle of diversity reception is to receive multiple copies carrying the same information through multiple channels (time, frequency or space). Since the transmission characteristics of multiple channels are different, the fading of multiple copies of the signal will not be the same, so The use of certain signal combining techniques enables the information contained in multiple copies to recover the original transmitted signal more correctly. Diversity reception is to counteract the effects of fading by improving the received signal, but this improvement requires increased receiver complexity.

In the Long Term Evolution (LTE) standard, the Space Frequency Block Code (SFBC) is adopted as the transmit diversity scheme of two antenna ports. The basic idea is that the information bits to be transmitted are conspicuously mapped by the constellation. The symbol is the unit that enters the space frequency encoder. For example, for an SFBC system with two transmit antennas, assuming that the symbol streams of the input SFBC encoder are C1, C2, ..., then C1 and C2 are transmitted on the first subcarriers of antenna 1 and antenna 2, respectively, while antenna 1 and antenna 2 are transmitted. -C2* and -C1* are transmitted on the second subcarrier, respectively. Where ( )* indicates the conjugate of the complex number, and the signal transmission in LTE uses the Orthogonal Frequency Division Multiplexing (OFDM) technique. For the receive diversity scheme using SFBC as the two-antenna port, the commonly used method for parsing SFBC does not consider the case where the receiving antenna has different noise floor, and the different noise floor of different receiving antennas also has certain influence on the analysis of SFBC. Therefore, the quality of the transmitted signal recovered in this case is not optimal.

Summary of the invention

To solve the above technical problem, the present invention provides a method and apparatus for analyzing a spatial frequency block code, and a storage medium.

The present invention provides a method for parsing a spatial frequency block code, including:

Determining the noise floor of each of the receiving antennas, wherein the number of the receiving antennas is at least two;

Transforming a frequency domain received signal of the receiving antenna according to a bottom noise of each of the receiving antennas;

Spatial frequency block code decoding is performed according to the transformed frequency domain received signal of each of the receiving antennas.

As an implementation manner, determining the noise floor of each receiving antenna separately includes:

And grouping channel estimation values of each orthogonal frequency division multiplexed pilot symbol on each of the receiving antenna frequency domain signal bandwidths, wherein channel estimation values in each group of channel estimation value groups are adjacent pilot symbols Corresponding channel estimation value;

Calculating a noise floor of each of the receiving antennas according to each group of channel estimation values corresponding to each of the receiving antennas.

As an implementation manner, the determining, according to each group of channel estimation values corresponding to each of the receiving antennas, calculating a noise floor of each of the receiving antennas includes:

Calculating, according to each group of channel estimation values of the receiving antenna, a conjugate multiplication value corresponding to each group of channel estimation values;

Calculating an absolute value of an average value of all conjugate multiplied values according to each of the conjugate multiplication values;

Calculating a power value of each pilot symbol according to a channel estimation value of each orthogonal frequency division multiplexing pilot symbol on a bandwidth of each receiving antenna signal;

Calculating an average value of power values of all pilot symbols according to the power value of each pilot symbol;

Calculating an absolute value of a difference between an absolute value of an average value of all the conjugate multiplied values and an average value of power values of all the pilot symbols, and an absolute value of the difference is a noise power value of the receiving antenna ;

Calculating an arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, where the arithmetic square root is the noise floor of the receiving antenna.

As an implementation manner, the transforming the frequency domain received signal of the receiving antenna according to the bottom noise of each receiving antenna includes:

The frequency domain received signal of each of the receiving antennas is divided by the noise floor of the receiving antenna to obtain the frequency domain received signal transformed by each antenna.

As an implementation manner, performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas includes:

Performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas, and determining a transmission signal estimated value of the transmitting antenna corresponding to each of the receiving antennas.

In addition, the present invention also provides an apparatus for parsing a spatial frequency block code, where the apparatus for parsing a spatial frequency block code includes:

a noise floor determining module configured to determine a bottom noise of each of the receiving antennas, wherein the number of the receiving antennas is at least two;

The frequency domain signal transformation module is configured to transform the frequency domain received signal of the receiving antenna according to the bottom noise of each of the receiving antennas;

The spatial frequency block code decoding module is configured to perform spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas.

As an implementation manner, the noise floor determination module includes:

a grouping submodule configured to group channel estimation values of each orthogonal frequency division multiplexed pilot symbol on each of the receiving antenna frequency domain signal bandwidths, wherein channel estimation values in each group of channel estimation value groups are Channel estimation values corresponding to adjacent pilot symbols;

The noise floor calculation sub-module is configured to calculate a noise floor of each of the receiving antennas according to each group of channel estimation values corresponding to each of the receiving antennas.

As an implementation manner, the noise floor calculation submodule includes:

The conjugate multiplication value calculation unit is configured to calculate a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antenna;

a first calculating unit configured to calculate an absolute value of an average value of all conjugate multiplied values according to each of the conjugate multiplication values;

a pilot symbol power value calculation unit configured to calculate a power value of each pilot symbol according to a channel estimation value of each orthogonal frequency division multiplexing pilot symbol on a bandwidth of each receiving antenna signal;

a second calculating unit, configured to calculate an average value of power values of all pilot symbols according to the power value of each pilot symbol;

a receiving antenna noise power value calculating unit configured to calculate an absolute value of a difference between an absolute value of an average value of the all conjugate multiplied values and an average value of power values of all the pilot symbols, the difference The absolute value is the noise power value of the receiving antenna;

The receiving antenna noise calculating unit is configured to calculate an arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, where the arithmetic square root is the noise floor of the receiving antenna.

As an implementation manner, the frequency domain signal transformation module is further configured to:

As an implementation manner, the spatial frequency block code decoding module is further configured to:

A storage medium having stored therein a computer program configured to perform the method of parsing a spatial frequency block code.

The invention determines the noise floor of the receiving antenna, transforms the frequency domain received signal of the receiving antenna according to the noise floor of the receiving antenna, and finally performs SFBC decoding according to the transformed frequency domain received signal. The invention considers the influence of different bottom noises of different receiving antennas on the received signals, normalizes the bottom noise values of different receiving antennas, thereby further optimizing the method of analyzing the SFBC, and at the same time, under the condition that the receiving antenna bottom noise is unbalanced Can further improve the performance of wireless communication systems.

DRAWINGS

1 is a transmitting end of a communication system having two transmitting antennas in an LTE system according to a preferred embodiment of the present invention;

2 is a receiving end of a communication system having two receiving antennas in an LTE system according to a preferred embodiment of the present invention;

3 is a schematic flowchart of a first embodiment of a method for parsing a spatial frequency block code according to the present invention;

4 is a schematic flowchart diagram of a second embodiment of a method for parsing a spatial frequency block code according to the present invention;

FIG. 5 is a schematic flowchart diagram of a third embodiment of a method for parsing a spatial frequency block code according to the present invention; FIG.

6 is a schematic diagram of a method for grouping pilot symbols in the present invention;

7 is a schematic diagram of functional modules of a first embodiment of a device for parsing a spatial frequency block code according to the present invention;

8 is a schematic diagram of functional modules of a second embodiment of an apparatus for parsing a spatial frequency block code according to the present invention;

9 is a schematic diagram of functional modules of a third embodiment of an apparatus for parsing a spatial frequency block code according to the present invention;

FIG. 10 is a schematic diagram showing the performance comparison between the conventional analytical SFBC method (Original) and the analytical SFBC method (New) of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention advances the frequency domain signals of the corresponding receiving antennas by different bottom noises of different receiving antennas The row transform is performed to normalize different bottom noises of different receiving antennas, and then SFBC decoding is performed according to the transformed frequency domain signals, thereby achieving the purpose of further optimizing the SFBC method under the influence of different bottom noise factors. Improve the performance of wireless communication systems. The core idea of the present invention is applicable to any form of multiple (multiple transmit antenna) multi-receive (multiple receive antenna) SFBC decoding methods. In the embodiment of the present invention, an SFBC decoding method of two transmissions and two receptions is specifically illustrated.

The specific structure and implementation steps of the present invention will be described below with reference to the accompanying drawings.

Referring to FIG. 1, FIG. 1 is a transmitting end of a communication system with two transmitting antennas in an LTE system according to a preferred embodiment of the present invention. The present transmitting end includes a channel coder 11, a modulator 12, an SFBC encoder 13, a transmitting antenna 14, and a transmitting antenna 15. Among them, the channel encoder 11 performs channel coding on the signal from the source, and inputs the channel for channel coding into the modulator 12 for digital modulation. The modulated signal is then input to the SFBC encoder 13 to SFBC encode the modulated signal. Finally, the encoded signal is transmitted to the receiving end through the transmitting antenna 14 and the transmitting antenna 15. In the antenna transmit diversity scheme at both ends of the LTE system, the channel estimation values of the pilot symbols are divided into two groups for SFBC coding, and the same SFBC coding block occupies two adjacent subcarriers of the two transmit antennas. For example, assuming that the symbol streams input to the SFBC encoder 13 are C1, C2, ..., the first subcarriers of the transmitting antenna 14 and the transmitting antenna 15 are respectively transmitted C1 and C2, and the second antenna of the transmitting antenna 14 and the transmitting antenna 15 are transmitted. -C2* and -C1* are transmitted on the carrier respectively. Where ()* indicates the conjugate of the complex number, and the signal transmission in LTE uses the OFDM technique.

Referring to FIG. 2, FIG. 2 is a receiving end of a communication system with two receiving antennas in an LTE system according to a preferred embodiment of the present invention. The receiving end receives the encoded signal sent from the transmitting end. The receiving end includes a channel decoder 21, a demodulator 22, an SFBC decoder 23, a receiving antenna 24, and a receiving antenna 25. The SFBC decoder 23 decodes the encoded signal received from the transmitting end, inputs it to the demodulator 22 for demodulation to recover the original modulated signal, and then inputs the demodulated modulated signal into the channel decoder 21, thereby Restore the original signal (ie, sink).

As an implementation manner, referring to FIG. 3, FIG. 3 is a schematic flowchart diagram of a first embodiment of a method for parsing a spatial frequency block code according to the present invention. In this embodiment, the method for parsing a spatial frequency block code includes:

Step S10, determining a bottom noise of each receiving antenna, where the number of the receiving antennas is at least two;

The ability of any wireless communication receiver to function properly depends not only on the size of the input signal that can be obtained, but also on its internal noise and the amount of external noise and interference. The noise floor of the receiver is generated by the movement of electrons. The noise floor of different devices is also different. The noise floor of different receiving antennas will affect the combined reduction of signals. Therefore, the number of receiving antennas targeted by the present invention should be at least two. There are many general calculation methods for the receiving antenna noise floor, so it will not be described again. The calculation method of the bottom noise of each receiving antenna is the same.

Step S20, converting a frequency domain received signal of the receiving antenna according to the bottom noise of each receiving antenna;

The frequency domain received signals of the respective receiving antennas are transformed according to the noise floor of each receiving antenna determined in step S10. In this embodiment, transforming the frequency domain received signal of the receiving antenna can realize the calculation formula of integrating the bottom noise parameter of the receiving antenna into the frequency domain receiving signal, and can also normalize the noise floor of each receiving antenna. Processing, any method capable of realizing the above two points can be used as a method of transforming the frequency domain received signal by the noise floor of the receiving antenna.

Step S30, performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas.

Performing SFBC decoding according to the frequency domain received signal of the received antenna in step S20. At this time, the algorithm for analyzing SFBC considers the influence of the noise floor of each receiving antenna on SFBC decoding, and also the noise floor of each receiving antenna. Normalization was performed during the calculation. There are many general calculation methods for analyzing SFBC decoding according to frequency domain signals, so this step will not be described again.

In this embodiment, by calculating and determining the noise floor of each receiving antenna, then transforming the frequency domain signal according to the noise floor of the receiving antenna, and finally performing the SFBC solution according to the transformed frequency signal. The code, resulting in a formula algorithm that decodes the signal encoding. In this embodiment, due to different receiving devices, the corresponding bottom noise is different, which will definitely affect the performance of SFBC decoding. Therefore, the present invention normalizes the noise floor of each receiving antenna by transforming the bottom noise of each receiving antenna, thereby further optimizing and improving the SFBC decoding performance and reducing the bit error rate of the wireless communication system.

As an implementation manner, referring to FIG. 4, FIG. 4 is a schematic flowchart diagram of a second embodiment of a method for parsing a spatial frequency block code according to the present invention. The first embodiment of the method for parsing a spatial frequency block code according to the present invention is analyzed. The method of spatial frequency block code includes the following steps S10:

Step S101, grouping channel estimation values of each orthogonal frequency division multiplexing pilot symbol on each of the receiving antenna frequency domain signal bandwidths, wherein channel estimation values in each group of channel estimation value groups are adjacent. a channel estimation value corresponding to the pilot symbol;

For the simple calculation method and process, in this embodiment, after the channel estimation values of the pilot symbols are grouped, the matrix method is used for calculation. Wherein, each group of channel estimation values may be composed of two, or four, or six even-numbered adjacent channel estimation values.

Step S102: Calculate a noise floor of each of the receiving antennas according to each group of channel estimation values corresponding to each of the receiving antennas.

In this embodiment, the channel estimation values of each orthogonal frequency division multiplexing pilot symbol on each receive antenna signal bandwidth are grouped, and then the bottom of each receiving antenna is calculated according to each group of channel estimation values corresponding to each receiving antenna. noise. The calculation method of the noise floor of each receiving antenna is the same. After grouping the channel estimates of the pilot symbols, the matrix can be used to easily calculate the process.

As an implementation manner, referring to FIG. 5, FIG. 5 is a schematic flowchart diagram of a third embodiment of a method for parsing a spatial frequency block code according to the present invention. The second embodiment of the method for parsing a spatial frequency block code according to the present invention is analyzed. The method of spatial frequency block code includes in the above step S102:

Step S1021: Calculate, according to each group of channel estimation values of the receiving antenna, a conjugate multiplication value corresponding to each group of channel estimation values;

Step S1022: Calculate an absolute value of an average value of all conjugate multiplication values according to each of the conjugate multiplication values;

Based on each of the conjugate multiplication values, the absolute value of the average of all the conjugate multiplied values is calculated to obtain the signal power.

Step S1023: Calculate a power value of each pilot symbol according to a channel estimation value of each orthogonal frequency division multiplexing pilot symbol on a bandwidth of each receiving antenna signal.

Step S1024, calculating an average value of power values of all pilot symbols according to the power value of each pilot symbol;

And calculating an average value of power values of all pilot symbols according to the power value of each pilot symbol to obtain total power.

Step S1025, calculating an absolute value of a difference between an absolute value of an average value of all the conjugate multiplied values and an average value of power values of all the pilot symbols, and an absolute value of the difference is a receiving antenna Noise power value;

Step S1026: Calculate an arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, where the arithmetic square root is the noise floor of the receiving antenna.

In this embodiment, each set of channel estimation values preferably consists of channel estimation values corresponding to two adjacent pilot symbols. Then, the conjugate multiplied value is obtained for each set of channel estimation values, and the conjugate multiplied values are averaged and then the absolute value is obtained to obtain the signal power. The channel estimates for each pilot symbol are evaluated as power values, and the power values are averaged to obtain the total power. The total power is then subtracted from the signal power to obtain the noise power of each of the receiving antennas. The noise power value of the receiving antenna is the square of the bottom noise value of the receiving antenna. Therefore, the square root of the noise is the square noise of the receiving antenna after the square root of the noise power of the receiving antenna is squared. The calculation method step is a calculation step of receiving antenna bottom noise, and the calculation method of the bottom noise of each of the other receiving antennas is the same.

As an implementation manner, the method for parsing a spatial frequency block code according to any one of the first to third embodiment steps S20 of the method for parsing a spatial frequency block code according to the present invention described above is the fourth embodiment. In the above step S20, the embodiment includes: dividing the frequency domain received signal of each receiving antenna by the noise floor of the receiving antenna to obtain the frequency domain received signal converted by each antenna.

It is assumed that the channel coefficients of the transmitting antenna 1 and the transmitting antenna 2 and the receiving antenna 1 are h ¹¹ and h ²¹ , respectively, and the channel coefficients of the transmitting antenna 1 and the transmitting antenna 2 and the receiving antenna 2 are h ¹² and h ^{22 respectively} ;

The signal of the receiving antenna 1 carrier k is

The signal of the carrier k of the receiving antenna 2 is

The signal of the receiving antenna 1 carrier k+1 is

The signal of the receiving antenna 2 carrier k+1 is

The transmission signal of carrier k is x _k , and the transmission signal of carrier k+1 is x _k+1 .

The noise of the receiving antenna 1 carrier k is

The noise of the receiving antenna 2 carrier k is

The noise of the receiving antenna 1 carrier k+1 is

The noise of the receiving antenna 2 carrier k+1 is

Then the frequency domain received signals are represented in matrix form as follows:

Where ( )* denotes the conjugate of the complex number.

According to the bottom noise of each antenna, the received signals of the respective receiving antennas are transformed as follows: the received signal of each antenna is divided by the noise floor of each antenna, and the specific transformation form is as follows:

After performing the above changes on the received signals of the respective receiving antennas, the frequency domain received signal matrix can be expressed as follows:

In this embodiment, the received signal of each antenna is divided by the noise floor of each receiving antenna, thereby realizing the frequency domain signal of each receiving antenna, and also realizing the normalization processing of the noise of different receiving antennas. The transformed frequency domain received signal can balance the influence of the bottom noise factors of different receiving antennas on the performance of the SFBC decoding method, so that the estimated value of the original transmitted signal can be decoded with higher quality.

As an implementation manner, the method for parsing a spatial frequency block code according to any one of the first to fourth embodiment steps S30 of the method for parsing a spatial frequency block code according to the present invention described above is included in the above step S30. And performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas, and determining a transmission signal estimated value of the transmitting antenna corresponding to each of the receiving antennas.

The SFBC decoding is performed based on the frequency domain received signal after the conversion. Since the channel coefficients of adjacent carriers are not very different, for ease of calculation, the present invention assumes that the channel coefficients of adjacent carriers are the same, namely:

According to the above assumption, the calculation matrix of the estimated value of the transmitted signal after SFBC decoding can be obtained as follows:

According to the estimated value formula of the SFBC decoded transmission signal, different SFBC coded blocks received by each receiving antenna can be decoded, thereby finally obtaining an estimated value of the restored original transmitted signal.

In this embodiment, considering the influence of different receiving antenna bottom noise on analyzing SFBC coding performance, according to the frequency domain received signals transformed by each receiving antenna, the SFBC decoding method can be further optimized, thereby obtaining a superior transmission signal. Estimated value calculation method.

As an implementation manner, referring to FIG. 7, FIG. 7 is a schematic diagram of functional modules of a first embodiment of a device for parsing a spatial frequency block code according to the present invention. In this embodiment, the apparatus for parsing the spatial frequency block code includes:

The noise floor determination module 10 is configured to determine a bottom noise of each of the receiving antennas, wherein the number of the receiving antennas is at least two;

The ability of any wireless communication receiver to function properly depends not only on the size of the input signal that can be obtained, but also on its internal noise and the amount of external noise and interference. The noise floor of the receiver is generated by the movement of electrons. The noise floor of different devices is also different. The noise floor of different receiving antennas will affect the combined reduction of signals. Therefore, the number of receiving antennas targeted by the present invention should be at least two. There are many general calculation methods for the receiving antenna noise floor, so I won't go into details. The calculation method of the noise floor of each receiving antenna is the same.

The frequency domain signal transforming module 20 is configured to transform the frequency domain received signal of the receiving antenna according to the bottom noise of each receiving antenna;

Based on the noise floor of each receiving antenna determined by the noise floor determining module 10, the frequency domain signal transforming module 20 transforms the frequency domain received signals of the respective receiving antennas. In this embodiment, transforming the frequency domain received signal of the receiving antenna can realize the calculation formula of integrating the bottom noise parameter of the receiving antenna into the frequency domain receiving signal, and can also normalize the noise floor of each receiving antenna. Processing, any method capable of realizing the above two points can be used as a method of transforming the frequency domain received signal by the noise floor of the receiving antenna.

The spatial frequency block code decoding module 30 is configured to perform spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas.

The spatial frequency block code decoding module 30 performs SFBC decoding according to the frequency domain received signal of the receive antenna transformed by the frequency domain signal transform module 20. At this time, the algorithm for parsing the SFBC considers the influence of the bottom noise of each receive antenna on the SFBC decoding. The noise floor of each receiving antenna is also normalized in the calculation process. There are many general calculation methods for analyzing SFBC decoding according to frequency domain signals, so this step will not be described again.

In this embodiment, the noise floor determination module 10 calculates and determines the noise floor of each receiving antenna, and then the frequency domain signal transform module 20 converts the frequency domain signal according to the noise floor of the receiving antenna, and finally the spatial frequency block code decoding module 30 The SFBC decoding is performed based on the transformed frequency signal, thereby obtaining a formula algorithm for decoding the signal encoding. In this embodiment, due to different receiving devices, the corresponding bottom noise is different, which will definitely affect the performance of SFBC decoding. Therefore, the present invention normalizes the noise floor of each receiving antenna by transforming the bottom noise of each receiving antenna, thereby further optimizing and improving the SFBC decoding performance and reducing the bit error rate of the wireless communication system.

As an implementation manner, referring to FIG. 8, FIG. 8 is a schematic diagram of a functional module of a second embodiment of a device for parsing a spatial frequency block code according to the first embodiment of the apparatus for parsing a spatial frequency block code according to the present invention. The device noise floor determination module 10 for parsing the spatial frequency block code includes:

The packet sub-module 101 is configured to group channel estimation values of each orthogonal frequency division multiplexed pilot symbol on each of the receiving antenna frequency domain signal bandwidths, where channel estimation values in each group of channel estimation value groups Channel estimation values corresponding to adjacent pilot symbols;

For the simple calculation method and process, in the embodiment, the grouping unit 101 needs to group the channel estimation values of the pilot symbols, and then perform calculation using a matrix method. Wherein, the estimated value of each group of channels may be composed of channel estimation values of two, or four, or six even-numbered adjacent pilot symbols.

The noise floor calculation sub-module 102 is configured to estimate, according to each group of channels corresponding to each of the receiving antennas Calculating, calculating the noise floor of each of the receiving antennas.

In this embodiment, the channel estimation values of each orthogonal frequency division multiplexing pilot symbol on each receive antenna signal bandwidth are grouped by the grouping unit 101, and then the noise floor calculation unit 102 estimates each group of channels corresponding to each receiving antenna. Value, calculate the noise floor of each receiving antenna. The calculation method of the noise floor of each receiving antenna is the same. After grouping the channel estimates of the pilot symbols, the matrix can be used to easily calculate the process.

As an implementation manner, referring to FIG. 9, FIG. 9 is a schematic diagram of a function module of a third embodiment of the apparatus for analyzing a spatial frequency block code according to the present invention. The second embodiment of the apparatus for parsing a spatial frequency block code according to the present invention, The noise floor calculation sub-module 102 includes:

The conjugate multiplication value calculation unit 1021 is configured to calculate a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antenna;

a first calculating unit 1022, configured to calculate an absolute value of an average value of all conjugate multiplied values according to each of the conjugate multiplication values;

The pilot symbol power value calculation unit 1023 is configured to calculate a power value of each pilot symbol according to a channel estimation value of each orthogonal frequency division multiplexing pilot symbol on each receive antenna signal bandwidth;

a second calculating unit 1024, configured to calculate an average value of power values of all pilot symbols according to the power value of each pilot symbol;

a receiving antenna noise power value calculating unit 1025 configured to calculate an absolute value of a difference between an absolute value of an average value of the all conjugate multiplied values and an average value of power values of all the pilot symbols, the difference The absolute value is the noise power value of the receiving antenna;

a receiving antenna noise calculating unit 1026 configured to be based on a noise power value of the receiving antenna, An arithmetic square root of the noise power value of the receiving antenna is calculated, and the arithmetic square root is the noise floor of the receiving antenna.

As an implementation manner, the frequency domain signal conversion module 20 according to any one of the first to third embodiments of the present invention for analyzing a spatial frequency block code, the frequency domain signal of the fourth embodiment of the apparatus for analyzing a spatial frequency block code of the present invention The transform module 20 is further configured to divide the frequency domain received signal of each of the receive antennas by the noise floor of the receive antenna to obtain the frequency domain received signal after each antenna transform.

The signal of the receiving antenna 1 carrier k is

The signal of the carrier k of the receiving antenna 2 is

The signal of the receiving antenna 1 carrier k+1 is

The signal of the receiving antenna 2 carrier k+1 is

The noise of the receiving antenna 1 carrier k is

The noise of the receiving antenna 2 carrier k is

The noise of the receiving antenna 1 carrier k+1 is

The noise of the receiving antenna 2 carrier k+1 is

Where ( )* denotes the conjugate of the complex number.

As an implementation manner, the spatial frequency block code decoding module 30 according to any one of the first to fourth embodiments of the present invention for analyzing the spatial frequency block code, the fifth embodiment of the device for analyzing the spatial frequency block code of the present invention The spatial frequency block code decoding module 30 is further configured to be according to the transformed The frequency domain received signals of each receiving antenna are spatially frequency block code decoded, and the estimated values of the transmitted signals of the transmitting antennas corresponding to each of the receiving antennas are determined.

Referring to Fig. 10, Fig. 10 is a schematic diagram showing the performance comparison between the conventional analytical SFBC method (Original) and the analytical SFBC method (New) of the present invention. The simulation channel is AWGN, the simulation bandwidth is 10M, and the bottom noise of the receiving antenna 0 and the receiving antenna 1 is 5dB. It can be seen from the figure that in the case where the noise of the two receiving antennas is unbalanced, the new algorithm of decoding SFBC has an improvement of about 1.5 dB in decoding performance compared with the original algorithm. Therefore, it can be explained that the noise of the receiving antenna is different. In the case of unbalanced, the new algorithm for analyzing SFBC optimized by the present invention has a significant performance improvement.

Embodiments of the present invention also describe a storage medium in which a computer program is stored, the computer program being configured to perform the method of parsing a spatial frequency block code of the foregoing embodiments.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Industrial applicability

The invention determines the noise floor of the receiving antenna, transforms the frequency domain received signal of the receiving antenna according to the noise floor of the receiving antenna, and finally performs SFBC decoding according to the transformed frequency domain received signal. The invention normalizes the bottom noise value of different receiving antennas to further optimize the method of analyzing SFBC, and can further improve the performance of the wireless communication system under the condition that the receiving antenna bottom noise is unbalanced.

Claims

A method for parsing a spatial frequency block code, wherein the method for parsing a spatial frequency block code comprises:

Determining the noise floor of each of the receiving antennas, wherein the number of the receiving antennas is at least two;

Transforming a frequency domain received signal of the receiving antenna according to a bottom noise of each of the receiving antennas;

Spatial frequency block code decoding is performed according to the transformed frequency domain received signal of each of the receiving antennas.
The method of parsing a spatial frequency block code according to claim 1, wherein said determining the noise floor of each of the receiving antennas separately comprises:

And grouping channel estimation values of each orthogonal frequency division multiplexed pilot symbol on each of the receiving antenna frequency domain signal bandwidths, wherein channel estimation values in each group of channel estimation value groups are adjacent pilot symbols Corresponding channel estimation value;

Calculating a noise floor of each of the receiving antennas according to each group of channel estimation values corresponding to each of the receiving antennas.
The method of parsing a spatial frequency block code according to claim 2, wherein calculating the noise floor of each of the receiving antennas according to each group of channel estimation values corresponding to each of the receiving antennas comprises:

Calculating, according to each group of channel estimation values of the receiving antenna, a conjugate multiplication value corresponding to each group of channel estimation values;

Calculating an absolute value of an average value of all conjugate multiplied values according to each of the conjugate multiplication values;

Calculating a power value of each pilot symbol according to a channel estimation value of each orthogonal frequency division multiplexing pilot symbol on a bandwidth of each receiving antenna signal;

Calculating an average value of power values of all pilot symbols according to the power value of each pilot symbol;

Calculating an absolute value of a difference between an absolute value of an average value of all the conjugate multiplied values and an average value of power values of all the pilot symbols, and an absolute value of the difference is a noise power value of the receiving antenna ;

Calculating a noise power value of the receiving antenna according to a noise power value of the receiving antenna The square root of the arithmetic, which is the noise floor of the receiving antenna.
The method of parsing a spatial frequency block code according to any one of claims 1 to 3, wherein the transforming the frequency domain received signal of the receiving antenna according to the noise floor of each of the receiving antennas comprises:

The frequency domain received signal of each of the receiving antennas is divided by the noise floor of the receiving antenna to obtain the frequency domain received signal transformed by each antenna.
The method of parsing a spatial frequency block code according to claim 4, wherein the performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas comprises:

Performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas, and determining a transmission signal estimated value of the transmitting antenna corresponding to each of the receiving antennas.
An apparatus for parsing a spatial frequency block code, the apparatus for parsing a spatial frequency block code comprising:

a noise floor determining module configured to determine a bottom noise of each of the receiving antennas, wherein the number of the receiving antennas is at least two;

The frequency domain signal transformation module is configured to transform the frequency domain received signal of the receiving antenna according to the bottom noise of each of the receiving antennas;

The spatial frequency block code decoding module is configured to perform spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas.
The apparatus for parsing a spatial frequency block code according to claim 6, wherein the noise floor determination module comprises:

a grouping submodule configured to group channel estimation values of each orthogonal frequency division multiplexed pilot symbol on each of the receiving antenna frequency domain signal bandwidths, wherein channel estimation values in each group of channel estimation value groups are Channel estimation values corresponding to adjacent pilot symbols;

The noise floor calculation sub-module is configured to calculate a noise floor of each of the receiving antennas according to each group of channel estimation values corresponding to each of the receiving antennas.
The apparatus for parsing a spatial frequency block code according to claim 7, wherein said noise floor calculation sub-module comprises:

The conjugate multiplication value calculation unit is configured to calculate a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antenna;

a first calculating unit configured to calculate an absolute value of an average value of all conjugate multiplied values according to each of the conjugate multiplication values;

a pilot symbol power value calculation unit configured to calculate a power value of each pilot symbol according to a channel estimation value of each orthogonal frequency division multiplexing pilot symbol on a bandwidth of each receiving antenna signal;

a second calculating unit, configured to calculate an average value of power values of all pilot symbols according to the power value of each pilot symbol;

a receiving antenna noise power value calculating unit configured to calculate an absolute value of a difference between an absolute value of an average value of the all conjugate multiplied values and an average value of power values of all the pilot symbols, the difference The absolute value is the noise power value of the receiving antenna;

The receiving antenna noise calculating unit is configured to calculate an arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, where the arithmetic square root is the noise floor of the receiving antenna.
The apparatus for parsing a spatial frequency block code according to any one of claims 6-8, wherein the frequency domain signal transform module is further configured to:

The frequency domain received signal of each of the receiving antennas is divided by the noise floor of the receiving antenna to obtain the frequency domain received signal transformed by each antenna.
The apparatus for parsing a spatial frequency block code according to claim 9, wherein the spatial frequency block code decoding module is further configured to:

Performing spatial frequency block code decoding according to the transformed frequency domain received signal of each of the receiving antennas, and determining a transmission signal estimated value of the transmitting antenna corresponding to each of the receiving antennas.
A storage medium storing a computer program configured to perform the method of parsing a spatial frequency block code according to any one of claims 1 to 5.