WO2000027062A1 - Recepteur multi-utilisateur - Google Patents

Recepteur multi-utilisateur Download PDF

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Publication number
WO2000027062A1
WO2000027062A1 PCT/JP1999/006079 JP9906079W WO0027062A1 WO 2000027062 A1 WO2000027062 A1 WO 2000027062A1 JP 9906079 W JP9906079 W JP 9906079W WO 0027062 A1 WO0027062 A1 WO 0027062A1
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WIPO (PCT)
Prior art keywords
signal
antenna
user
interference
stage
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PCT/JP1999/006079
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English (en)
Japanese (ja)
Inventor
Shousei Yoshida
Naoto Ishii
Akihisa Ushirokawa
Original Assignee
Nec Corporation
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Publication date
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Publication of WO2000027062A1 publication Critical patent/WO2000027062A1/fr

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    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • H04B1/126—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means having multiple inputs, e.g. auxiliary antenna for receiving interfering signal

Definitions

  • the present invention relates to a multi-user receiving apparatus, and in particular, receives a plurality of code division multiple access (CDMA) user signals having different transmission powers from each other and receives each user signal.
  • CDMA code division multiple access
  • the present invention relates to a multi-user receiving apparatus capable of performing interference cancellation as well as signal demodulation.
  • CDMA Code Division Multiple Access
  • a multi-user receiving apparatus f using interference weight control in a parallel multi-stage configuration has been proposed.
  • This multi-user receiving apparatus is simple and has excellent characteristics.
  • the signals of the plurality of media include, for example, audio, video, and data signals.
  • Such signals have different information transmission rates and different required reception qualities. Assuming the same required reception quality for each user signal with a different transmission rate, a user signal with a high transmission rate requires a large transmission power. Even at the same transmission rate, a user signal with a high required reception quality requires higher transmission power.
  • a user signal having a high transmission rate or a required reception quality causes great interference with a user signal having a low transmission rate or a required reception quality.
  • the transmission power of each user signal increases in proportion to the transmission rate, which is an important problem.
  • the transmission rate is determined by the antenna directivity toward the user signal with a lower transmission rate.
  • High-rate user signals are also received, and high-rate user signals cause great interference with low-rate user signals. That is, the reception quality of each user signal fluctuates greatly depending on its positional relationship, and the overall system characteristics deteriorate.
  • a multi-user spatio-temporal interference canceller that organically combines an adaptive antenna and a multi-user interference canceller has been proposed. This technology is described in "CD MA Multi-Choose Spatio-Temporal Interference Cancellation Method” (Ishii, Yoshida, and Gogawa, 1989, IEICE General Conference, B-5-126, pp. 489) ).
  • the interference estimation value of each user signal is converted into an interference estimation value for each antenna element using the reception antenna weight, and interference removal is performed at each antenna element input before directivity control.
  • This coupling device has excellent interference elimination characteristics, and the size of the device is relatively small.
  • Figure 1 shows the configuration for receiving user signals at multiple transmission rates using a multi-user spatiotemporal interference canceller.
  • interference of user signals at different transmission rates is eliminated.
  • destruction processing There is no distinction in the destruction processing, and mutual space-time interference cancellation is performed.
  • the user signals at multiple transmission rates are assumed to be high-rate user signals and low-rate user signals, and the numbers of user signals are denoted by KH and KL, respectively.
  • antennas 101—1 to 101—N receive the CDMA signal, and the interference of the first-stage interference cancellation processing section 102-1 of the high-rate and low-rate user signals.
  • Estimation unit IEU: Interference Estimation Unit
  • IEU Interference Estimation Unit
  • the interference estimation unit 103 of I 02—M 1 1 1 to 103— 1— KH,..., 103-M- 1-103-M-KH, 104-1 1 1 to 104— 1—KL,..., 104-M- 1 to 104— M— KL is Input the interference cancellation residual signal for each antenna obtained in the interference cancellation processing in the preceding stage and the symbol replica corresponding to the same user signal in the preceding stage, and receive and demodulate each stage with the antenna directivity unique to each user signal. At the same time, a symbol replica of the current stage is generated and transmitted to the next stage.
  • the interference estimator 103-1—! 103- 1— KH, ⁇ , 103— M— 1 to 103-M— KH, 104_ 1-] to 104— 1—KL,..., 104-M- 1 to 104— M— KL is the current stage A spread signal related to the difference between the symbol replica of the previous stage and the symbol replica of the preceding stage is converted and output for each antenna.
  • Delay device 105—1—1 to 105—1—N, ⁇ , 105- (M-1) — 1 to: L 0 5— (M-1) —N is the interference cancellation residue for each received signal or antenna
  • the difference signal is calculated by the interference estimator 103—1-1—1 to 103—1—KH,..., 103—M—1 to 103—M—KH, 104—1-1—104—1—KL,..., 104—M — 1 to: L 04-M — Delay until the KL processing result is output.
  • Subtractor 106— 1—1 to 106— 1—N,..., 106- (M ⁇ 1) 1 1 to: I 06— (M ⁇ 1) —N is the value of each stage of each user signal.
  • the final stage interference estimator 103-M-1 to 103-M-KH, 104-M-1 to 104-M-KL outputs demodulated signals of high-rate and low-rate user signals.
  • Interference estimator 103—1-1—103—1—KH, ⁇ , 103—M—1–103—M—KH and 104—1-1—104—1—KL, ⁇ , 104-M-1 to 104-M-KL are shown in FIG.
  • a plurality of path unit processing units are provided corresponding to a multipath propagation path including a plurality of paths (# 1 to #L).
  • the despreading means 111-1-11-N inputs the interference cancellation residual signal for each antenna at the preceding stage and despreads to antenna i.
  • the multipliers 12—1 to 12—N weight the antenna by multiplying the outputs of the despreading means 11—1 to 11—N by weights wl to wN.
  • the adder 13 combines the outputs of the multipliers 12-1 to 12-N.
  • the multiplier 14 weights the symbol replica corresponding to the same user signal at the previous stage.
  • the adder 15 adds the output of the adder 13 and the output of the multiplier 14.
  • the detector 16 demodulates the output of the adder 15 using the transmission path estimation value in units of paths (# 1 to #L).
  • the detector 16 is composed of a transmission path estimating means 17, a complex conjugate means 18, and a multiplier 19, and performs synchronous detection and demodulation and weights for realizing maximum ratio combining of a plurality of paths (# 1 to #L). Has the role of performing
  • the adder 20 combines the outputs of the detector 16 for each pass (# 1 to #L).
  • the determiner 21 determines the output of the adder 20.
  • the multiplier 22 multiplies the output of the decision unit 21 by the transmission path estimation value for each path (# 1 to #L) to generate a symbol replica of the current stage, and outputs the symbol replica to the next stage.
  • the subtractor 23 subtracts the output of the multiplier 14 from the output of the multiplier 22.
  • the multiplier 24 weights the output of the subtractor 23.
  • Multiplier 25-1-25—N is a complex conjugate weight w obtained by normalizing the weight used for antenna weighting to the output of multiplier 24 by the number of antennas. Multiply by 1 * / N to wN * / N.
  • the spreading means 26-1 to 26-N spreads the output of the multipliers 25-1 to 25-N for each antenna.
  • Adder 2 7— 1 to 2 7— N is each path of spreading means 2 6— 1 to 26—N
  • the outputs of (# 1 to #L) are added for each antenna.
  • the first stage interference estimator 10 3--1—1 to 1 to 10 3—1— KH, 10 4-1-1 to 10 4— 1-KL is the residual noise of each previous antenna.
  • An antenna reception signal is input as a signal, and 0 is used as a symbol replica corresponding to the same user signal at the previous stage.
  • the final stage interference estimator 10 3— M—1 to 10 3— M—KH, 10 4— M—1 to 10 4 -M- KL uses only the demodulated signal output from the adder 20. Output and do not perform subsequent interference estimation processing. In the final stage, the process of updating the interference cancellation residual signal is not performed.
  • the weights wl to wN to be multiplied for performing the antenna directivity control steering antenna weights and adaptive control weights determined separately based on the estimation of the arrival direction of the user signal are used.
  • the weighting factors to be multiplied by the multiplier 14 and the multiplier 24 are, for example, 11 (1—hi) m ⁇ 1 (hi is a real number less than 1; You. These coefficients have the effect of relaxing the interference elimination operation. Instead of removing all the interference components in the first stage, the interference components are gradually eliminated in multiple stages.
  • the interference cancellation operation is relaxed to suppress the interference cancellation error, and the transmission channel estimation error and the decision symbol error are improved. It is possible to optimize the interference elimination characteristics at the same time.
  • this interference weight control is very effective, and various methods can be considered for weighting the interference weight control.
  • the present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to provide a multi-user receiving apparatus capable of obtaining a large interference removing effect with a relatively small apparatus scale. Is to do.
  • a plurality of antennas for receiving a plurality of code division multiplex access signals, wherein the plurality of code division multiplexes received by the plurality of antennas are provided.
  • a multi-user receiving apparatus that demodulates an access if signal and cancels interference between the plurality of code division multiple access signals, wherein a predetermined condition among the plurality of code division multiple access signals is satisfied. No.
  • One signal group is subjected to antenna directivity control and interference removal by a multi-user interference canceller, and the antenna directivity of a second signal group of the plurality of code division multiple access signals that does not satisfy the above condition is determined.
  • a multi-user receiver configured to perform interference cancellation only by sex control.
  • a plurality of antennas for receiving a plurality of code division multiplex access signals, wherein the plurality of code division multiplex access signals received by the plurality of antennas are demodulated and the plurality of antennas are received.
  • a multi-user receiving apparatus that removes interference between code-division multiplexed access signals, wherein a first signal group satisfying a preset condition among the plurality of code-division multiplexed access signals is provided.
  • a multi-user receiving device comprising:
  • a plurality of antennas for receiving a plurality of code division multiplex access signals, wherein the plurality of code division multiplex access signals received by the plurality of antennas are demodulated and the plurality of antennas are received.
  • a multi-user receiving apparatus for performing interference cancellation processing at a plurality of stages on each of the code division multiplex access signals to remove interference.
  • the interference cancellation residual signal for each antenna obtained in the interference cancellation processing at the preceding stage and the symbol replica corresponding to the same user signal at the previous stage are input, and at each stage of the interference cancellation processing, Each user signal is received and demodulated with an antenna directivity unique to the user signal, and a current-stage symbol replica is generated and transmitted to the next stage. Spreading is performed on the difference between the current-stage symbol replica power and the previous-stage symbol replica. The signal is converted for each antenna and output, and the output signal is subtracted from the interference cancellation residual signal for each preceding antenna to update the interference cancellation residual signal for each antenna at the current stage to perform interference cancellation.
  • An interference removal residual for each antenna in which each signal of the first signal group is removed at least once from a second signal group that does not satisfy the above condition among the plurality of code division multiplexed access signals.
  • Signal And force to each user signal multiuser receiving device configured to perform interference cancellation by receiving and demodulating a unique antenna directivity is provided.
  • a plurality of antennas for receiving a plurality of code division multiplex access signals, demodulating the plurality of code division multiplex access signals received by the plurality of antennas, and A multi-user receiving apparatus for performing interference cancellation processing at a plurality of stages on each of the code division multiplex access signals, thereby satisfying a preset condition among the plurality of code division multiplex access signals.
  • a spread signal relating to the difference from the symbol replica at the preceding stage is converted and output for each antenna, and the output signal is subtracted from the interference cancellation residual signal for each antenna at the preceding stage to obtain an interference cancellation residual for each antenna at the current stage.
  • a plurality of antennas for receiving a plurality of code division multiplex access signals, wherein the plurality of code division multiplex access signals received by the plurality of antennas are demodulated and the plurality of antennas are received.
  • a multi-user receiver that removes interference at multiple stages for each code-division multiplexed access signal, corresponding to the interference cancellation residual signal for each antenna obtained by the interference cancellation process at the previous stage and the same user signal at the previous stage Symbol replicas to be received, and at each stage of the interference removal processing, receive and demodulate each user signal with antenna directivity unique to each user signal, generate a symbol replica of the current stage, and transmit it to the next stage.
  • An interference estimating unit that converts and outputs a spread signal related to a difference between a current-stage symbol replica and the preceding-stage symbol replica for each antenna;
  • the output of the interference estimating unit of each stage of each signal of the first signal group is subtracted for each antenna from the signal obtained by delaying the interference cancellation residual signal by a predetermined value by the delay unit, and the output of each of the current stage antennas is subtracted.
  • a multi-user receiving apparatus including a demodulation unit that receives and demodulates and outputs the signal with antenna directivity unique to the signal.
  • the multi-user interference canceller removes the interference of user signals in the same direction and high-speed rate that cannot be removed by antenna directivity control.
  • the present invention includes a plurality of antennas for receiving a plurality of code division multiplex access signals, demodulates a plurality of code division multiplex access signals received by the plurality of antennas, and a plurality of code division
  • a multi-user receiving apparatus that performs interference cancellation for multiple access signals in a plurality of stages, an antenna direction for a first signal group that satisfies a preset condition among a plurality of code division multiplexed access signals is provided.
  • FIG. 1 is a block diagram showing a configuration example of a conventional multi-user receiving apparatus
  • FIG. 2 is a block diagram showing a configuration of a multi-user receiving apparatus according to an embodiment of the present invention
  • FIG. 3 is a high-speed rate shown in FIG. FIG.
  • FIG. 4 is a block diagram showing the configuration of the demodulation unit for the low-rate user signal shown in FIG. 2, and
  • FIG. 5 is a block diagram showing a configuration of a multi-user receiving apparatus according to another embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a multi-user receiving apparatus according to one embodiment of the present invention.
  • a multi-user receiving apparatus performs conventional multi-user spatio-temporal interference cancellation on a high-rate user signal, and shifts a low-rate user signal to the final stage of a high-rate user signal. Only the antenna directivity control is performed using the interference cancellation residual signal as an input, that is, a signal in which the high-rate user signal is removed from the received signal.
  • the multi-user receiving apparatus by omitting the operation of the multi-user interference canceller for each low-rate user signal, it is possible to minimize the decrease in the interference removal performance, thereby reducing the processing amount. It can be significantly reduced.
  • the multi-user receiving apparatus when the number of antennas is N (N is an integer of 1 or more), when antennas 1-1 to 1-N receive a CDMA signal, a high-rate user signal is transmitted.
  • IEU Interference Estimation Unit
  • the noise estimation unit for each stage in a high-rate user signal 3-1 to 1 to 3—1 -KH, ⁇ , 3— M— :! ⁇ 3—M—KH inputs the interference cancellation residual signal for each antenna obtained in the interference cancellation processing in the preceding stage and the symbol replica corresponding to the same user signal in the preceding stage, and each user in each stage of the interference cancellation processing. It receives and demodulates the signal with its own antenna directivity, generates a symbol replica of the current stage, and transmits it to the next stage.
  • the interference estimator 3-1-1 to 3-1-KH,..., 3_M-1 to 3-M-KH Convert and output for each antenna.
  • Delay device 5—1—1 to 5—1—N,..., 5— (M-1) —1 to 5— (M—1) —N is the received signal Estimation unit 3—1 1 1 33—1—KH,..., 3—M—Delay until the processing result of 1—3—M—KH is output.
  • Subtractor 6—1—1 to 6—1—N,..., 6— (M—1) -1-6- (M ⁇ 1) ⁇ 1N is an interference estimator for each signal of each user signal. 1— 1 to 3— 1— ⁇ , ⁇ ,
  • the demodulation unit (DEM: Demodulation unit) for low-rate user signals 4-1 to 4-1-1 KL is for each antenna obtained by the M-1 stage interference cancellation processing for the high-rate user signal. And outputs the demodulated signal of each user signal at a low speed rate by receiving the demodulated interference cancellation residual signal and receiving and demodulating the antenna directivity unique to each user signal.
  • DEM Demodulation unit
  • FIG. 3 shows the interference estimators 3-1-1 to 3-1-1 KH, ..., 3-M-1-3-M-KH at each stage in the high-rate user signal shown in Fig. 2.
  • FIG. 4 is a block diagram showing a configuration, which is the same as the above-described conventional example.
  • the interference estimating units 3-1-1-1-1-KH,..., 3-M-1-3-M-KH at each stage in a high-rate user signal Interference estimator for high-rate and low-rate user signals 103—1-1—: L 03—1—KH,.
  • Despreading means 11-1 to I-1N receive the interference cancellation residual signal for each antenna at the preceding stage and perform despreading for each antenna.
  • the multipliers 12-1 to 12-N perform antenna weighting by multiplying the outputs of the despreading means 11-1 to 11-1N by weights wl to wN.
  • the adder 13 combines the outputs of the multipliers 12-1 to 12-N.
  • the multiplier 14 weights the symbol replica corresponding to the same user signal at the previous stage.
  • the adder 15 adds the output of the adder 13 and the output of the multiplier 14.
  • the detector 16 uses the output of the adder 15 as the transmission path estimate for each path (# 1 to #L). And demodulate.
  • the detector 16 includes a transmission path estimating unit 17, a complex conjugate unit 18, and a multiplier 19, performs synchronous detection and demodulation, and performs weighting for realizing maximum ratio combining of a plurality of paths (# 1 to #L). Has the role of performing
  • the adder 20 combines the outputs of the detector 16 for each pass (# 1 to #L).
  • the determiner 21 determines the output of the adder 20.
  • the multiplier 22 multiplies the output of the decision unit 21 by the transmission path estimation value for each path (# 1 to #L) to generate a symbol replica of the current stage, and outputs the symbol replica to the next stage.
  • the subtractor 23 subtracts the output of the multiplier 14 from the output of the multiplier 22.
  • the multiplier 24 weights the output of the subtractor 23.
  • the multiplier 25-1-25-N multiplies the output of the multiplier 24 by complex conjugate weights w 1 * / N to wN * / N obtained by normalizing the weight used in the antenna weighting by the number of antennas.
  • the spreading means 26-1 to 26-N spread the output of the multiplier 25-1-25-1N for each antenna.
  • Adder 27- 1 to 27- -N is each path of diffusion means 26- 1 to 26-N
  • the outputs of (# 1 to #L) are added for each antenna.
  • the first-stage interference estimator 3-1—1 1 to 3_1—KH receives the antenna reception signal as the interference cancellation residual signal for each antenna in the previous stage, and outputs 0 as a symbol replica corresponding to the same user signal in the previous stage. Is used.
  • the final-stage interference estimator 3—M—1 to 3-—M-KH outputs only the demodulated signal output from the adder 20, and does not perform the subsequent interference estimation processing. In the final stage, the process of updating the interference cancellation residual signal is not performed.
  • weights wl to wN to be multiplied for performing the antenna directivity control steering antenna weights and adaptive control weights determined separately based on the estimation of the arrival direction of the user signal are used.
  • the weighting coefficients to be multiplied by the multiplier 14 and the multiplier 24 are, for example, eleven (1 ⁇ ) m ⁇ 1 (that is, a real number equal to or less than 1, m is an integer of 2 or more and M or less) and hi.
  • FIG. 4 is a demodulation unit 41 for the low-rate user signal shown in FIG. 4 is a block diagram illustrating a configuration of 4_KL.
  • FIG. 4 a plurality of path unit processing units are provided corresponding to a multipath propagation path including a plurality of paths (# 1 to #L).
  • the despreading means 51-1-51-1N inputs the interference cancellation residual signal for each antenna obtained by the M-1 stage interference cancellation processing for the high-rate user signal, and performs despreading for each antenna.
  • the multipliers 52—1 to 52—N weight the output of the despreading means 51-1-51—N with the antenna.
  • the adder 53 is a multiplier 52—! ⁇ 52—N output is synthesized.
  • the detector 54 demodulates the output of the adder 53 using the transmission path estimation value for each path.
  • the adder 58 combines the output of the detector 54 for each path and outputs a demodulated ⁇ ′ ⁇ signal.
  • Weights wl to wN to be multiplied to perform antenna directivity control use steering antenna weights and adaptive control weights determined separately based on the estimation of the direction of arrival of the user signal.
  • FIG. 5 is a block diagram showing a configuration of a multi-user receiving apparatus according to another embodiment of the present invention.
  • a multi-user receiving apparatus is a demodulation unit (DEM: Demodulation Unit) for low-speed user signals.
  • DEM Demodulation Unit
  • the configuration is the same as that of the multi-user receiving apparatus according to the embodiment of the present invention except that the configuration is performed, and the same components are denoted by the same reference numerals.
  • the operation of the same component is the same as that of the above-described embodiment of the present invention.
  • demodulation of a low-rate user signal is performed by inputting an interference cancellation residual signal for each antenna obtained by M ⁇ 1-stage interference cancellation processing of a high-rate user signal. Therefore, there is a delay due to the time required for the M-1 stage interference removal processing of the high-rate user signal.
  • the amount of delay depends on the detection method and the device mounting method, and is generally not negligible.
  • high-speed closed-loop transmission power control is used, so if there is a demodulation delay, its characteristics are greatly degraded.
  • the multi-user space-time interference is removed for the high-rate user signal, and only the antenna directivity control is performed for the low-rate user signal.
  • the interference cancellation residual signal for each antenna obtained by the interference cancellation processing at the first stage of the high-rate user signal is used.
  • the low-rate user signal is demodulated from the interference cancellation residual signal from which the high-rate user signal is not sufficiently removed, so that the reception quality of the low-rate user signal is slightly degraded, but the demodulation delay is minimized. Can be suppressed.
  • the overall characteristics may be improved.
  • an input for demodulation of a low-rate user signal can be obtained by interference removal processing of an arbitrary stage of a high-rate user signal.
  • a configuration using the interference cancellation residual signal for each antenna is considered, and these are also included in the present invention.
  • the multi-user receiving apparatus of the present invention is also effective when the required reception quality of each user signal is different or when the transmission power of each user signal is different for other reasons.
  • the transmission power is large, the user signal is subjected to antenna directivity control and interference cancellation is performed by a multi-user interference canceller.
  • the multi-user interference canceller removes interference of high-rate user signals in the same direction that cannot be eliminated by antenna directivity control, thereby reducing the low-speed rate. Therefore, it is possible to preferentially suppress interference of a high-rate user signal with respect to another user signal, and it is possible to easily achieve excellent interference removal performance.
  • the demodulation delay can be reduced by demodulating the low-rate user signal with the interference cancellation residual signal obtained by the first-stage interference cancellation processing of the high-rate user signal as input.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radio Transmission System (AREA)

Abstract

Cette invention se rapporte à un récepteur multi-utilisateur, qui reçoit des signaux d'utilisateur CDMA ayant des puissances de transmission différentes les uns des autres, qui module ces signaux d'utilisateur et qui élimine les interférences de ces signaux d'utilisateur. Une opération de contrôle de la directivité d'antenne et une opération d'élimination des interférences par un éliminateur d'interférences multi-utilisateur sont effectuées pour les signaux d'utilisateur ayant des débits de transmission élevés, parmi des signaux d'utilisateur CDMA ayant des débits de transmission différents les uns des autres et reçus par des antennes (1-1 à 1-N) au niveau de sections d'élimination des interférences (2-1 à 2-M) pour les signaux d'utilisateur ayant des débits de transmission élevés. Un signal résiduel d'élimination des interférences pour chaque antenne généré par l'élimination des interférences aux étages (M-1) appliquées aux signaux d'utilisateur ayant des débits de transmission élevés, est introduit dans des sections de démodulation (4-1 à 4-KL) pour les signaux d'utilisateur ayant des débits de transmission faibles. Les signaux d'utilisateur ayant des débits de transmission faibles sont reçus avec les directivités d'antenne propres aux signaux d'utilisateur ayant des débits de transmission faibles et ils sont alors démodulés. Les signaux ainsi démodulés, parmi les signaux d'utilisateur ayant des débits de transmission faible, sont ensuite produits à la sortie des sections de démodulation.
PCT/JP1999/006079 1998-10-30 1999-11-01 Recepteur multi-utilisateur WO2000027062A1 (fr)

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JP30928698A JP2000138605A (ja) 1998-10-30 1998-10-30 マルチユーザ受信装置
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JP3619729B2 (ja) * 2000-01-19 2005-02-16 松下電器産業株式会社 無線受信装置および無線受信方法
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JP2006041562A (ja) * 1999-11-18 2006-02-09 Matsushita Electric Ind Co Ltd 基地局装置及び無線受信方法
WO2002007358A1 (fr) * 2000-07-14 2002-01-24 Fujitsu Limited Recepteur amcr
JP4744725B2 (ja) 2001-05-25 2011-08-10 三菱電機株式会社 干渉キャンセラ
JP2002374227A (ja) * 2001-06-13 2002-12-26 Nec Corp マルチユーザ干渉除去装置
US7856071B2 (en) * 2005-07-26 2010-12-21 Alcatel-Lucent Usa Inc. Multi-path acquisition in the presence of very high data rate users

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M. TSUTSUI ET AL.: "Application of the interference canceller with array antennas for DS-CDMA to high-speed transmission users (in Japanese)", TSUSHIN 1, LECTURE PROCEEDINGS DISTRIBUTED AT THE MEETING IN 1998, ORGANIZED BY THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS,, 6 March 1998 (1998-03-06), (TOKYO), pages 492, XP002932905 *
M. TSUTSUI ET AL.: "Partial application of the interference canceller with array antennas and the interference cancel technology for DS-CDMA to high-speed transmission users (in Japanese)", TECHNICAL RESEARCH REPORT, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS,, vol. 98, no. 89, 29 May 1998 (1998-05-29), (TOKYO), pages 19 - 24, XP002932902 *
N. ISHII ET AL.: "Characteristics of CDMA multi-user time-space interference", THE COMMUNICATION SOCIETY MEETING PROCEEDINGS 1 (1998), ORGANIZED BY THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS,, 7 September 1998 (1998-09-07), (TOKYO), pages 389, XP002932904 *
N. ISHII ET AL.: "Method for eliminating CDMA multi-user time-space interference (in Japanese)", TSUSHIN 1, LECTURE PROCEEDINGS DISTRIBUTED AT THE MEETING IN 1998, ORGANIZED BY THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS,, 6 March 1998 (1998-03-06), (TOKYO), pages 490, XP002932903 *

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