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WO2003077440A1 - Recepteur d'antenne adaptative et son procede de reception - Google Patents

Recepteur d'antenne adaptative et son procede de reception Download PDF

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Publication number
WO2003077440A1
WO2003077440A1 PCT/JP2003/002798 JP0302798W WO03077440A1 WO 2003077440 A1 WO2003077440 A1 WO 2003077440A1 JP 0302798 W JP0302798 W JP 0302798W WO 03077440 A1 WO03077440 A1 WO 03077440A1
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WO
WIPO (PCT)
Prior art keywords
signal
multiplying
output
antenna
transmission line
Prior art date
Application number
PCT/JP2003/002798
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English (en)
Japanese (ja)
Inventor
Masayuki Kimata
Original Assignee
Nec Corporation
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 Nec Corporation filed Critical Nec Corporation
Priority to AU2003211887A priority Critical patent/AU2003211887A1/en
Publication of WO2003077440A1 publication Critical patent/WO2003077440A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891—Space-time diversity
    • H04B7/0897—Space-time diversity using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths

Definitions

  • the present invention relates to an adaptive antenna receiving apparatus and its receiving method.
  • the present invention relates to an adaptive antenna receiving apparatus and method, and more particularly, to an adaptive antenna receiving method in which a CDMA transmission signal is received from a plurality of antenna elements constituting an adaptive antenna.
  • CDMA adaptive antenna receivers used in the CDMA system include, for example, “TDL adaptive array antenna using spreading processing gain for spread spectrum multiple access” by Wang, Kono, and Imai. J. Vol. J 75-BII, No. 11, p. 815-825, 1992) and Tanaka, Miki, and Sawahashi, “Characteristics of Decision Feedback Coherent Adaptive Diversity in DS-CDMA” (The Institute of Electronics, Information and Communication Engineers, As described in the Technical Report of the Radio Communication Systems RCS 96-102, January 1996), adaptive control is performed by using the weight control error signal extracted after despreading in antenna weight control. The antenna directivity pattern that maximizes the received SIR (Signal to Interference Ratio) is used for interference cancellation.
  • SIR Signal to Interference Ratio
  • FIG. 1 is a configuration diagram showing an example of a conventional CDMA adaptive antenna receiving apparatus when a common error signal is used.
  • the number of receive antennas is N (N is an integer of 2 or more), the number of multipaths is L (L is an integer of 1 or more), and the CDMA adaptive antenna reception for the kth user (k is an integer of 1 or more) The device will be described.
  • this type of CDMA adaptive antenna receiving apparatus has a multiplicity of Ni receiving antennas 1-1 to 1—N and L paths for the kth user, as shown in FIG.
  • the L signal processing means 30-1 to 30-L corresponding to each multipath have the same configuration, respectively, and include delay units 2-1 to 2-L and N despreading circuits 3-1-11-1 to 3—L—N and antenna weighting / synthesizing circuit 4-1-1-4L.
  • the N receiving antennas 11-1 to 1-N are arranged close so that the respective received signals have a correlation.
  • the delay units 2-1 to 2-L are configured to delay the signals received by the N receiving antennas 1-1 to 1-1N in accordance with each of the L multipaths.
  • the received signals output from the delay units 2-1 to 2—L are despread by the despreading circuits 3-1 to 1-3—L1N, and then the antenna weighting and combining circuit 4—! 4 to L—Sent to MMSE control circuit 5.
  • FIG. 4 is a block diagram showing a configuration of each of L to L.
  • FIG. Each of the antenna weighting / synthesizing circuits 4-1 to 4-L has the same configuration, and the multiplier 13-:! ⁇ 13-N and adder 1.4.
  • the configuration of the signal processing means 30-1 will be described below as an example.
  • the antenna weighting / synthesizing circuit 4-1 receives the signal despread by the despreading circuits 3-1-1-3-1-N.
  • the received signal is multiplied by the antenna weights generated by the MMSE control circuit 5 by the multipliers 13-1 to 13 -N in the antenna weighting and combining circuit 4-1, and further added by the adder 14. , Weighted synthesis, and sent to the adder 10 in FIG.
  • the antenna weighting / synthesizing circuit 4-1 controls the amplitude and phase of the reception signals of the reception antennas 11-1 to 1-N so that the reception signal has a gain and the interference is suppressed so that the reception is performed. It forms the directionality of the array antenna.
  • Rake combining is performed by adding the outputs of the antenna weighting and combining circuits 41 1 to 41 L by the adder 10, and the result is input to the subtractor 11.
  • the subtracter 11 converts the output of the reference signal generation circuit 12 from the rake (RAKE) composite output of the adder 10.
  • the common error signal is generated by subtraction, and the common error signal is sent to the MMSE control circuit 5.
  • the MMSE control circuit 5 uses the common error signal obtained from the subtractor 11 and the antenna reception signal corresponding to each multipath output by the despreading circuits 3-1-1 to 3-L-N, The antenna weight is controlled so that the root mean square of the common error signal is minimized.
  • an algorithm as fast as possible for example, an RLS (Recursive Least Square) algorithm can be used.
  • the despread signals y k , l, n (m) received by the (l ⁇ N) th receiving antennas are given by the multipliers 13-1 to 13-N in the antenna weighting / synthesizing circuit 4-1-4-1 L
  • the antenna weights generated by the MMSE control circuit 5 are multiplied, and weighted and combined by the adder 14.
  • the antenna combined output z k i (m) of the first path for the k-th user is
  • RAKE combining is performed by adding the outputs of the antenna weighting combining circuits 41 1 to 41 L by the adder 10 in FIG.
  • the RLS (Recursive Least Square) algorithm used in the MMSE control circuit 5 controls the antenna weights so as to directly minimize the sum of squares of the exponential weighting error using all input samples up to the present.
  • ⁇ is a weighting constant of 0 to ⁇ 1
  • e k (m) is a common error obtained by subtracting the rake combined output of the adder 10 from the output of the reference signal generating circuit 12 by the subtractor 11. Represents a signal.
  • the subtracter 11 subtracts the rake combined output of the adder 10 from the output of the reference signal generation circuit 12 to generate a common error signal, and outputs the common error signal to the MMSE control circuit 5.
  • the correlation matrix R xxk is calculated by exponentially weighted time average based on the above equation (3).
  • Rxxk, m) a R YX v (m— 1) + Xk (m) (m)
  • X k (m) is a despreading circuit 3-1:! ⁇ 3—L—N It represents the despread signal vector of the output despread signal, where Xk (m) is defined as follows.
  • k ( m ) [yk, i, i ( m ) 'yk, i, 2 (m), ..., yk'i'N ( m ),
  • the adaptive update algorithm used in the MMSE control circuit 5 includes a common error signal e k (m) obtained from the subtractor 11 and the despreading circuit 3-1 1 1 to 3—L-N.
  • the antenna weight is updated using the signal. In this process, the antenna weight is adaptively controlled based on the MMSE criterion so that the common error signal e k (m) is minimized.
  • W k (m) represents the antenna weight vector of the antenna weight generated by the MMSE control circuit 5
  • W3 ⁇ 4- (m) [Wk, i 1 (m), w3 ⁇ 4. > 1) 2 (m), ⁇ , Wk, i,] sr (m),
  • Equations (8) and (9) must calculate the inverse matrix of the correlation matrix R xxk , so if the matrix is inverted using the matrix formula, R ⁇ i 1 becomes
  • the first problem is that the amount of operation of the adaptive update algorithm used in the MMSE control circuit 5 becomes large. Since the amount of calculation is large, a processing load is applied to the calculation circuit. The reason is that since the common error signal is used, the adaptive update algorithm that controls the antenna weights so that the root mean square of the common error signal is minimized must calculate the (NXL) -order correlation matrix R xxk. Because it must be.
  • the second problem is that the adaptive update algorithm used in the MMSE control circuit 5 follows the instantaneous transmission line fluctuation with the antenna weight, so that the characteristics deteriorate when the transmission line fluctuation is fast. is there. The reason is that when the fluctuation of the transmission line is fast, the weighting constant must be set small, and the effect of reducing noise is reduced. Disclosure of the invention
  • An object of the present invention is to provide an adaptive antenna receiving apparatus and a receiving method thereof, in which the amount of operation of an adaptive updating algorithm for calculating an antenna weight coefficient is significantly reduced, and the processing load of an arithmetic circuit is reduced. .
  • Another object of the present invention is to provide an adaptive antenna receiving device capable of improving characteristic degradation when transmission line fluctuation is fast and a method thereof.
  • An adaptive antenna receiving apparatus comprises: despreading means for despreading a received signal from a plurality of antenna elements for each finger; multiplying a despread signal output from each of the despreading means by a weight coefficient.
  • Weighting factor multiplying means channel distortion estimating means for estimating channel distortion based on each output from the weighting factor multiplying means, and complex conjugate means for generating each complex conjugate of the estimated channel distortion.
  • Each of these complex conjugates is multiplied by each output from the weighting coefficient multiplying means to obtain transmission path distortion.
  • Multiplying means for compensating for the above, combining means for adding the respective outputs of the multiplying means and performing rake combining, generating a common error signal between the combined output and the reference signal, and adding the common error signal to the transmission path.
  • Error signal generating means for deriving by multiplying each of the distortions; and using each output of the error signal generating means and each of the despread signals, for each finger, the root mean square of the common error signal is minimized.
  • Control means for controlling the weighting coefficient so that
  • Another adaptive antenna receiving apparatus comprises: despreading means for performing despreading processing on received signals from a plurality of antenna elements for each finger; and weighting the despread signals output from the despreading means, respectively.
  • Weight coefficient multiplying means for multiplying coefficients; transmission path distortion estimating means for estimating transmission path distortion based on each output from the weight coefficient multiplying means; and complex conjugate for generating each complex conjugate of the estimated transmission path distortion Means for multiplying each of the complex conjugates and each output from the weighting coefficient multiplying means to compensate for transmission line distortion; and Synthesizing means for multiplying each of the transmission line distortions and a reference signal; and using each output of the second multiplying means and each of the despread signals for each finger.
  • the weight And a control means for controlling the coefficients.
  • Still another adaptive antenna receiving apparatus includes: despreading means for performing despreading processing on received signals from a plurality of antenna elements for each finger; and a weighting factor for a despread signal output from the despreading means.
  • Weighting factor multiplying means a channel distortion estimating means for estimating channel distortion based on each output from the weighting factor multiplying means, and a complex conjugate hand for generating each complex conjugate of the estimated channel distortion.
  • a multiplying means for multiplying each of the complex conjugates and each output from the weighting coefficient multiplying means to compensate for transmission path distortion; a combining means for adding the respective outputs of the multiplying means to perform Rake combining; Error signal generating means for generating a common error signal between the combined output and the reference signal and multiplying the common error signal by each of the transmission line distortions to derive the common error signal; And control means for controlling the weighting coefficient so as to minimize the root mean square of the common error signal using each output of the error signal generation means and each of the despread signals.
  • Another adaptive antenna receiving apparatus for receiving from a plurality of antenna elements.
  • Despreading means for despreading the signal for each finger; weighting coefficient multiplying means for multiplying the despread signal output from the despreading means by a weighting coefficient; and Channel distortion estimating means for estimating channel distortion based on the output; complex conjugate means for generating each complex conjugate of the estimated channel distortion; and each complex conjugate and each output from the weight coefficient multiplying means.
  • a first multiplication unit that compensates for transmission line distortion by multiplying each of the transmission line distortions; a combining unit that adds the outputs of the first multiplication unit to perform Rake combining; A second multiplying means for multiplying, and a control means provided in common to the fingers and controlling the weight coefficient using each output of the second multiplying means and each of the despread signals.
  • the receiving method comprises: a despreading step of despreading a received signal from a plurality of antenna elements for each finger; and a weight for multiplying the despread signal output from the despreading step by a weight coefficient.
  • a coefficient multiplying step a channel distortion estimating step of estimating a channel distortion based on each output from the weighting coefficient multiplying step; a step of generating each complex conjugate of the estimated channel distortion;
  • a multiplication step for compensating for transmission line distortion by multiplying the output from the weighting coefficient multiplication step with each output from the weighting coefficient multiplication step;
  • An error signal generating step of generating a common error signal with the signal and multiplying the common error signal by each of the transmission line distortions to derive the error signal;
  • Another receiving method includes a despreading step for despreading a received signal from a plurality of antenna elements for each finger, and assigning a weight coefficient to the despread signal output from each of the despreading steps.
  • Still another receiving method is a despreading step of despreading a received signal from a plurality of antenna elements for each finger, and weighting the despread signal output from the despreading step.
  • a weighting coefficient multiplying step for multiplying the coefficients; a transmission path distortion estimating step for estimating transmission path distortion based on each output from the weighting coefficient multiplication step; and a step for generating each complex conjugate of the estimated transmission path distortion.
  • Another receiving method includes a despreading step of despreading a received signal from a plurality of antenna elements for each finger, and assigning a weight coefficient to the despread signal output from each of the despreading steps.
  • the adaptive update algorithm calculates the antenna weight using the N-order correlation matrix independently for each path, and calculates the (NXL) -order correlation matrix
  • the antenna weight coefficient is controlled using the adaptive update algorithm so that the root mean square of the common error signal after rake combining is independently minimized for each finger.
  • the function of compensating the transmission line distortion and the MMSE control circuit that generates the antenna weight are separated separately, so that the antenna weight generated by the MMSE control circuit is Without compensating for signal transmission path distortion, control can be performed to maximize the signal arrival direction and average SIR, and control can be performed to maximize instantaneous SIR by rake combining. Can be improved.
  • FIG. 1 is a configuration diagram of an example for explaining a conventional technique.
  • FIG. 2 is a diagram illustrating a configuration of an antenna weighting synthesis circuit.
  • FIG. 3 is a configuration diagram of one embodiment of the present invention.
  • FIG. 4 is a diagram illustrating the configuration of the antenna weighting and combining circuit.
  • FIG. 5 is a diagram comparing B ER characteristics between the conventional example and the present invention.
  • FIG. 6 is a configuration diagram of another embodiment of the present invention.
  • FIG. 7 is a configuration diagram of still another embodiment of the present invention.
  • FIG. 8 is a configuration diagram of another embodiment of the present invention.
  • FIG. 9 is a configuration diagram of still another embodiment of the present invention.
  • FIG. 10 is a configuration diagram of another embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 3 shows the present invention.
  • FIG. 2 is a diagram showing a configuration of an embodiment of the present invention, and portions equivalent to those in FIG. 1 are denoted by the same reference numerals.
  • the number of receiving antennas is N (N is an integer of 2 or more)
  • the number of multipaths is L (L is an integer of 1 or more)
  • the CD for the kth user k is an integer of 1 or more
  • the MA adaptive antenna receiving device will be described.
  • the C-DMA adaptive antenna receiving apparatus transmits L signals corresponding to multi-paths with N receiving antennas 1-1 to 1-N and L paths to the k-th user.
  • Each of the signal processing means 20 0-1 to 20-L corresponding to each multipath has the same configuration, and includes delay units 2-1 to 2-L and N despreading circuits 3-1 to 1- 3—L—N, antenna weighting / synthesizing circuit 4-1 1 to 4-1 L, MMSE (Minimum Mean Square Error) control circuit 5-1 to 5—L, channel estimation circuit 6-1 Up to 6—L, complex conjugate circuit 7-1 to 7—L, multiplier 8— :! ⁇ 8-L, and a multiplier 91-1 ⁇ 9_L.
  • the N receiving antennas 11-1 to 1-N are arranged close so that the respective received signals have a correlation.
  • Delay devices 2 _ 1 to 2 — L is N receiving antennas
  • each of the L antenna weighting / synthesizing circuits 4-1 to 4-L as shown in FIG. 4, a despreading circuit 3-1 to 3-1 to 3-1 ⁇ - ⁇
  • the signal is multiplied by the antenna weights generated by the L MMSE control circuits 5-1 to 5-L in accordance with multipliers 13-1 to 13-N and added by the adder 14.
  • the weights are combined and sent to the transmission path estimation circuits 6-1 to 6-L and multipliers 8-1 to 8-L in Fig. 3.
  • the transmission path distortion is estimated using the output of the antenna weighting and combining circuit 4-1 to 4-1 L, and the estimation result is converted to a complex conjugate circuit 7- 1 to 7—L and multiplier 9-1 1 to 9-1 L are sent to L.
  • the complex conjugate circuits 7-1 to 7-L generate complex conjugates of the transmission line distortion estimated by the transmission path estimation circuits 6-1 to 6-L.
  • Complex conjugate circuit 71 The complex combination of transmission line distortion generated by 1-7-L is used by multipliers 8-1-1-8-L for antenna weighting and combining circuit 41 :! By multiplying the output of ⁇ 1 L, the transmission line distortion is compensated.
  • the outputs of the multipliers 8-1 to 8 _L in which the transmission line distortion has been compensated are added by the adder 10 to perform rake combining and input to the subtractor 11.
  • the function of compensating for the transmission line distortion is as follows.
  • the update speed of the antenna weight by the adaptive update algorithm used in the MMSE control circuit 5-1 to 5-L Therefore, by separately separating the compensation function of the channel distortion, control is performed so that the instantaneous SIR is maximized by the rake combining by the adder 10.
  • the antenna weights generated by the MMSE control circuits 5-1 to 5_L do not compensate for the transmission path distortion of the desired signal, but control so that the signal arrival direction and the average SIR are maximized. I do.
  • the subtracter 11 subtracts the rake combined output of the adder 10 from the output of the reference signal generation circuit 12 to generate a common error signal.
  • the common error signal is divided into L respective multipliers 9 — 1 ⁇ 9 ⁇ 1 L is multiplied by the transmission line distortion estimated by the transmission line estimation circuit 6 ⁇ 1 ⁇ 6 ⁇ L, and sent to each of the L MMSE control circuits 5-1-5 ⁇ L.
  • the adaptive update algorithm used in each of the L MMSE control circuits 5-1 to 5-L uses a high-speed RLS (Recursive Least Square) algorithm, and is independent for each finger.
  • RLS Recursive Least Square
  • FIG. 3 is a configuration diagram showing a CDMA adaptive antenna receiving apparatus according to the present invention when a common error signal is used.
  • the number of receiving antennas is N (N is an integer of 2 or more), the number of multipaths is L (L is an integer of 1 or more), and a CDMA adaptive antenna receiving device for the kth user (k is an integer of 1 or more) Will be described.
  • the CDMA adaptive antenna receiving apparatus of the present invention supports multi-paths with N receiving antennas 11 1 to 11 N and L paths for the k-th user. It is composed of L signal processing means 20-1 to 20-L, an adder 10, a subtractor 11, and a reference signal generation circuit 12.
  • the L signal processing means 20 0-1 to 20-L corresponding to each multipath have the same configuration, and include a delay device 2-1 to 2-L and N despreading circuits 3-1-1 to 3—L—N, antenna weighting / synthesizing circuit 4-1 1 to 4-L, MM SE control circuit 5-1 to 5—L, channel estimation circuit 6_1 to 6_L, complex conjugate circuit 7-1 to 7 — L and multipliers 8—1 to 8—L and 9—1 to 9—L.
  • Each of the N receiving antennas 11 1 to 11 N receives a signal in which a desired signal and a plurality of interference signals are multiplexed, and is located close to each other so that the received signals are correlated.
  • Delay device 2— :! 2 to L are distinguished from the 1st path to the Lth path by delaying the signals received by N reception antennas 1-1 to 1-N according to each of the L multipaths Is done.
  • the received signals output from the delay units 2-1 to 2 _ L are despread by the despreading circuit 3-1 1 to 3 _ L-N, and then the antenna weighting and combining circuit 4-! ⁇ 4-L and MMSE control circuit 5-1 to 5-L are sent.
  • FIG. 4 is a block diagram showing a configuration of the antenna weighting / synthesizing circuits 411 to 4-1L.
  • Each of the antenna weighting / synthesizing circuits 4-1 to 4-L has the same configuration, and includes multipliers 13_1 to 13-N and an adder 14.
  • the following description will be made taking the signal processing means 20-1 as an example.
  • the received signal despread by the despreading circuit 3-1-1-3-1-N is converted into the MMSE control circuit by the multiplier 13-1-1-3-N
  • the antenna weights generated in 5-1 are multiplied, added by an adder 14 and weighted and combined, and sent to the transmission path estimating circuit 6-1 and the multiplier 8-1 in FIG.
  • the antenna weighting / synthesizing circuit 4-1 controls the amplitude and phase of the received signals of the receiving antennas 11-1 to 11-N to provide a gain to the desired signal, and to suppress the interference to receive the array antenna. To form a directivity.
  • the transmission path estimation circuit 6-1 estimates the transmission path distortion using the output of the antenna weighting / synthesizing circuit 4-1 and sends the estimation result to the complex conjugate circuit 7-1 and the multiplier 9-1.
  • the complex conjugate circuit 711 generates a complex conjugate of the transmission path distortion estimated by the transmission path estimation circuit 6-1.
  • the complex conjugate of the transmission path distortion generated by the complex conjugate circuit 7-1 is multiplied by the output of the antenna weighting / synthesizing circuit 411 by the multiplier 8-1, thereby compensating the transmission path distortion.
  • the outputs of the multipliers 8-1 to 8 _L whose transmission line distortion has been compensated are added by an adder 10 to perform rake combining, and input to a subtracter 11.
  • the function of compensating for this transmission line distortion is based on the MMSE control circuit 5— :! In the update rate of the antenna weights by the adaptive update algorithm used in 5-L, it is not possible to compensate for the transmission path distortion in time. Control to maximize the instantaneous SIR. At this time, the MM SE control circuit 5— :! With the antenna weights generated by ⁇ 5-L, the transmission path distortion of the desired signal is not compensated, and the signal arrival direction and the average SIR are controlled to be maximum.
  • the transmission path estimation circuits 6-1 to 6-L provided for the transmission path distortion compensation function are, for example, V o 1. J 72-BII, N o. 1, pp. 7-15, 1989, as described in the “16 QAM phasing distortion compensation scheme for land mobile communications”
  • V o 1 J 72-BII, N o. 1, pp. 7-15, 1989
  • the antenna weight updating circuit 4-1 to 4—L cannot update the antenna weight in the MM SE control circuit 5-1 to 5—L in time.
  • Each output has a large phase difference with each other.
  • a function for compensating for transmission line distortion specifically, a transmission line estimation circuit 6-1 to 6-L and a complex conjugate circuit 7-1 to 7-L are further provided to provide a transmission path fluctuation.
  • the function of compensating for the transmission line distortion is used to control the phase difference between each finger output to be small, perform accurate rake combining, and maximize the instantaneous SIR by rake combining. It is. If the transmission line fluctuation is slow,? ⁇ 1 ⁇ 3 £ Control circuit 5 _ 1-5-L In order to keep up with the update speed of the antenna weight sufficiently, the phase difference of each output of the antenna weighting and combining circuit 4-1-4-1 L is controlled to be sufficiently small. Therefore, there is no need to have a function of compensating for transmission line distortion, but it is clear that it may be.
  • the present invention provides a solid line 1 shown in FIG.
  • the BER Bit Error Rate
  • the horizontal axis is Eb / No (signal power to noise power ratio) per bit of data symbol.
  • the faster the fluctuation of the transmission line the more the characteristic deteriorates as indicated by the one-dot chain line 200.
  • the subtracter 11 subtracts the rake combined output of the adder 10 from the output of the reference signal generation circuit 12 to generate a common error signal.
  • the common error signal is divided into L respective multipliers 9 one:! 9L is multiplied by the transmission path distortion estimated by the transmission path estimation circuits 6-1 to 6-L and sent to the L MMSE control circuits 5-1 to 5-L.
  • a common error signal multiplied by the transmission line distortion and a despreading circuit 3-1 to 1-3 are applied to the multipliers 9_1 to 9-L.
  • Antenna weight is controlled so that the root mean square of the common error signal is minimized using the antenna reception signals corresponding to each multipath output by L ⁇ N.
  • the adaptive update algorithm used in each of the L MMSE control circuits 5-1 to 5_L is independently controlled for each finger using the RLS (Recursive Least Square) algorithm, which is a fast algorithm.
  • RLS Recursive Least Square
  • Nth order correlation matrix -Use an algorithm that controls the weight.
  • xk, i (m) [ y k, i, i (m), yk, i, 2 (m),, yk, l, N (m)] T
  • T represents transposition
  • the antenna weight is adaptively controlled based on the MMSE criterion so that the common error signal e k (m) is minimized.
  • W k) 1 (m) W k> 1 (m-1) + Tk'lRxxk'r 1 (m-1) Xk, l (m) e k> 1 * (m)
  • wk ' ⁇ (m) [Wk, i , i (m), Wk, i, 2 (m), ⁇ , Wk, i, N r
  • equations (16) and (17) must calculate the inverse matrix of the correlation matrix R xxkil , both equations (13) and (14) can be used to reduce the computational complexity of this inverse matrix calculation. Inverting the edges using the matrix formula gives Is
  • the multipath signal is separated by the spreading code, and the correlation between each finger is almost eliminated. Therefore, each finger independently calculates the antenna weight using the Nth-order correlation matrix RLS (Recursive Least Square) Algorithm and
  • NXL This is equivalent to the RLS (Recursive Least Square) algorithm that calculates the next correlation matrix.
  • RLS Recursive Least Square
  • R 1] L is the autocorrelation matrix of finger 1
  • R22 is the autocorrelation matrix of finger 2
  • R 12 is the cross correlation matrix of finger 1 and finger 2
  • R 21 is the cross correlation of finger 1 and finger 1
  • Each represents a correlation matrix.
  • W (m) is the weight vector of finger 1 and finger 2 of the m symbol
  • W T (m) is the weight vector of finger 1 of the m symbol
  • W 2 (m) is the finger of the m symbol.
  • Weight vector X (m) is the despread signal vector of finger 1 and finger 1 of the mth symbol
  • d (m) is the despread signal vector of finger 1 of the mth symbol
  • X 2 (m ) Represents the despread signal vector of the m-th symbol's finger 1-2
  • E (m) is multiplied by the transmission path distortion of the finger m-1 and the transmission path distortion h 2 of finger 2. Each represents a common error signal.
  • the optimal weights obtained in circuit 5 are equivalent.
  • W is the weight vector of finger 1 and finger 1
  • W x is the weight vector of finger 1
  • W 2 is the weight vector of finger 2
  • S is the correlation vector of finger 1 and finger 2
  • Si is The correlation vector of finger 1 and S 2 represent the correlation vector of finger 2 respectively.
  • the function of compensating for the transmission line distortion and the MM SE control circuit 5-1 to 5-L for generating the antenna weight are separated from each other so that the MM SE control circuit 5—
  • the antenna weights generated by 1 to 5—L do not compensate for the transmission path distortion of the desired signal, but control so that the signal arrival direction and the average SIR are maximized.
  • Rake combining by adder 10 Can be controlled to maximize the instantaneous SIR.
  • FIG. 6 is a configuration diagram showing another embodiment of the present invention. 6, the same components as those in FIG. 3 are indicated by the same reference numerals.
  • the difference between the configuration shown in FIG. 6 and the configuration shown in FIG. 3 is that a decision unit 15 that decides the symbol data of the rake combined output that is the output of the adder 10, and that the decision output and the reference signal generation circuit 1 That is, a switch 16 provided between the second output and the second output is added.
  • a decision unit 15 that decides the symbol data of the rake combined output that is the output of the adder 10
  • a switch 16 provided between the second output and the second output
  • the rake combined output of the adder 10 is input to the decision unit 15, and the output of the decision unit 15 is not only output as the reception symbol of the k-th user, but also the reference signal during reception other than the known pilot signal. It is also sent to Switch 16 because it is used as The reference signal generation circuit 12 generates a known pilot signal, and the switch 16 selects the output of the reference signal generation circuit 12 when receiving a pilot signal. 15 Select the output of the receive symbol of 5 and send it to the subtractor 11. As a result, the subtractor 11 uses not only the output of the reference signal generation circuit 12 but also the output of the decision unit 15 to calculate a common error signal, and each of the L MMSE control circuits 5-1 to 5—Adaptive update used in L
  • This embodiment has a new effect that the antenna weight of the adaptive update algorithm used in each of the L MMSE control circuits 5-1 to 5-L can be converged more quickly.
  • FIG. 7 shows another CDMA adaptive antenna receiving apparatus of the present invention when this SMI algorithm is used as an adaptive update algorithm used in each of the L MMSE control circuits 5-1 to 5-L.
  • a subtractor for calculating a common error signal by subtracting the rake combined output of the adder 10 from the output of the reference signal generation circuit 12 is removed, and a signal output from the reference signal generation circuit 12 is used instead of the common error signal.
  • the reference signal multiplied by the transmission line distortion and the despreading circuit 3-1-1-1 to The antenna weight is controlled using the antenna reception signals corresponding to each multipath output by 3-LN.
  • R X xk, l (m) ⁇ R xx k, l (m-1)
  • the antenna weights generated by the L MMSE control circuits 5_1 to 5-L are:
  • the MM SE control circuit that compensates for the transmission line distortion and generates the antenna weight 5— :! -5-L is separated separately, so that the antenna weights generated by the MMSE control circuits 5-1-5-L do not compensate for the transmission path distortion of the desired signal. Control can be performed to maximize the instantaneous SIR by the rake combining by the adder 10, and the same effect can be obtained that can improve the characteristic deterioration. can do.
  • FIG. 8 is a configuration diagram showing another CDMA adaptive antenna receiving apparatus of the present invention when an RLS (Recursive Least Square) algorithm is used as an adaptive updating algorithm used in one MMSE control circuit 5.
  • Another configuration of the CDMA adaptive antenna receiving apparatus according to the present invention is a transmission channel estimating circuit having a function of compensating for channel distortion to signal processing means 30-1 to 30-L of the conventional CDMA adaptive antenna receiving apparatus. 6-1 to 6-L, complex function circuit 7-1 to 7-L and multipliers 8-1 to 8_L, 9-1 to 9-L are further provided.
  • the L signal processing means 25-1 to 25-L corresponding to each multipath are provided with a delay device 2— :! ⁇ 2—L, N despreading circuits 3-1—1 to 3—L—N, antenna weighting synthesis circuit 41 :! 4 _L, channel estimation circuit 6-1-6 _L, complex conjugate circuit 7-1-7-L and multipliers 8-1-8 -L, 9-1-9-L .
  • the function of compensating for the transmission line distortion and the MM SE control circuit 5 that generates the antenna weight are separated separately, so that the antenna weight generated by the MM SE control circuit 5 is different.
  • Without compensating for the transmission line distortion of the desired signal controlling to maximize the signal arrival direction and average SIR, and controlling to maximize the instantaneous SIR by rake combining by the adder 10. It is possible to improve the characteristic deterioration.
  • FIG. 9 is a configuration diagram showing another CDMA adaptive antenna receiving apparatus of the present invention when an RLS (Recursive Least Square) algorithm is used as an adaptive updating algorithm used in one MMSE control circuit 5.
  • a determinator 15 is provided at the rake combined output of the calorie calculator 10, and a switch 16 is provided between the output of the determinator 15 and the output of the reference signal generation circuit 12.
  • the signal processing means 25-1 to 25-L include a transmission path estimation circuit 6 _ 1 to 6 _L, a complex conjugate circuit 7-1 to 7 _L, and a Containers 8-1 to 8-L, 9-1 to 9-1 L are provided.
  • the subtractor 11 calculates the common error signal using not only the output of the reference signal generation circuit 12 but also the output of the decision unit 15, and calculates the antenna weight of the adaptive update algorithm used in the MMSE control circuit 5.
  • the function of compensating for the transmission line distortion and the MMSE control circuit 5 that generates the antenna weight are separated separately, so that the antenna weight generated by the MMSE control circuit 5 is: Control to maximize signal arrival direction and average SIR without compensating for transmission path distortion of desired signal, and to maximize instantaneous SIR by rake combining by adder 10 And characteristic deterioration can be improved.
  • This embodiment has a new effect that the antenna weight of the adaptive update algorithm used in the MMSE control circuit 5 can be converged more quickly.
  • FIG. 10 is a configuration diagram showing another CDMA adaptive antenna receiving apparatus of the present invention when the SMI algorithm is used as the adaptive update algorithm used in one MMSE control circuit 5.
  • the signal processing means 25-1 to 25-L have a transmission path estimating circuit 6-1 to 6-L, a complex conjugate circuit 7-1 to 7-1 L and a multiplier 8 _, which are functions for compensating for transmission path distortion. 1-8-L, 9-1-9-L are provided.
  • the function of compensating for the transmission line distortion and the MMSE control circuit 5 that generates the antenna weight are separated separately, and the antenna generated by the MMSE control circuit 5 is separated.
  • the weight does not compensate for the transmission path distortion of the desired signal, but controls so that the arrival direction of the signal and the average SIR are maximized, and maximizes the instantaneous SIR by rake combining by the adder 10. It can be controlled, and the characteristic deterioration can be improved.
  • the present invention can be applied to an adaptive antenna receiver other than the CDMA system.
  • an adaptive updating algorithm is used independently for each finger so that the root mean square of the common error signal after rake combining is minimized.
  • the weight coefficient is controlled, it can be used in all MMSE control circuits.
  • the amount of operation of the adaptive update algorithm used can be greatly reduced from (NL) 2 to N2L, which has the effect of reducing the processing load on the arithmetic circuit.
  • the function of compensating for the transmission line distortion and the MMSE control circuit for generating the antenna weight are separated separately, so that the antenna generated by the MMSE control circuit is separated.
  • the weight does not compensate for the transmission path distortion of the desired signal, but can be controlled to maximize the signal arrival direction and average SIR, and to control the instantaneous SIR by rake combining.
  • characteristic deterioration can be improved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Cette invention concerne un récepteur d'antenne adaptative comprenant une unité arithmétique dont la charge est allégée par la réduction sensible du complexe de calcul d'un algorithme de mise à jour adaptatif servant à calculer le facteur de pondération de l'antenne. On peut contrôler le poids de l'antenne en permettant à chacun des doigts d'utiliser de manière indépendante un algorithme de mise à jour adaptatif de sorte que la moyenne des carrés du signal d'erreur commun après une combinaison Rake soit la plus basse possible, ce qui réduit sensiblement la complexité de calcul. Si la fluctuation de la ligne de transmission est rapide, la fonction de compensation de la distorsion de la ligne de transmission est séparée des circuits de commande MMSE (5-1à 5-L) pour que le poids de l'antenne soit généré. La distorsion de la ligne de transmission d'un signal choisi n'est pas compensée par l'utilisation du poids de l'antenne généré par l'algorithme de mise à jour adaptatif. Un contrôle est donc effectué de sorte que la direction d'arrivée du signal et que le rapport signal/brouillage moyen soient maximum et que le rapport signal/brouillage instantané soit maximum au moyen d'une combinaison Rake. La dégradation caractéristique peut ainsi être réduite.
PCT/JP2003/002798 2002-03-13 2003-03-10 Recepteur d'antenne adaptative et son procede de reception WO2003077440A1 (fr)

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JP2002068177A JP2003273774A (ja) 2002-03-13 2002-03-13 適応アンテナ受信装置及びその方法
JP2002-68177 2002-03-13

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CN100369390C (zh) * 2004-07-22 2008-02-13 中兴通讯股份有限公司 多天线阵列接收无线传输的方法
CN108226887A (zh) * 2018-01-23 2018-06-29 哈尔滨工程大学 一种观测量短暂丢失情况下的水面目标救援状态估计方法

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Publication number Priority date Publication date Assignee Title
CN100349383C (zh) * 2004-04-14 2007-11-14 华为技术有限公司 一种信道估计的方法和装置

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JPH1155216A (ja) * 1997-08-05 1999-02-26 Nec Corp Ｃｄｍａ適応受信装置
JP2002026787A (ja) * 2000-07-10 2002-01-25 Yrp Mobile Telecommunications Key Tech Res Lab Co Ltd 無線受信装置
EP1182728A2 (fr) * 2000-08-25 2002-02-27 Nec Corporation Dispositif d'antennes de réception adaptatif

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH1155216A (ja) * 1997-08-05 1999-02-26 Nec Corp Ｃｄｍａ適応受信装置
JP2002026787A (ja) * 2000-07-10 2002-01-25 Yrp Mobile Telecommunications Key Tech Res Lab Co Ltd 無線受信装置
EP1182728A2 (fr) * 2000-08-25 2002-02-27 Nec Corporation Dispositif d'antennes de réception adaptatif

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100369390C (zh) * 2004-07-22 2008-02-13 中兴通讯股份有限公司 多天线阵列接收无线传输的方法
CN108226887A (zh) * 2018-01-23 2018-06-29 哈尔滨工程大学 一种观测量短暂丢失情况下的水面目标救援状态估计方法
CN108226887B (zh) * 2018-01-23 2021-06-01 哈尔滨工程大学 一种观测量短暂丢失情况下的水面目标救援状态估计方法

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