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Fast receiving method and fast receiver

A receiving method, fast technology, applied in gearbox control/balance, baseband system components, error correction/detection using convolutional code, etc., can solve problems such as iterative equalization effect deterioration

Inactive Publication Date: 2002-10-09
NTT DOCOMO INC
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AI Technical Summary

Problems solved by technology

Estimation error will cause the effect of iterative equalization to deteriorate

Method used

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  • Fast receiving method and fast receiver
  • Fast receiving method and fast receiver
  • Fast receiving method and fast receiver

Examples

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Embodiment Construction

[0089] First aspect (1) of the present invention

[0090] figure 1 An exemplary configuration of a MIMO system to which the present invention is applied is shown.

[0091] In each of the transmitters S1...SN the information sequence c is encoded in the encoders 11-1,...,11-N 1 (i) to c N (i), and the outputs of these codes are supplied to modulators 13-1, ..., 13-N as modulated signals through interleavers 12-1, ..., 12-N, so that carrier signals are modulated according to these modulated signals, to transmit signals b 1 (k) to b N (k). In this way, the transmitted signal b from the transmitters S1,...,SN 1 (k)...b N (k) Form N sequence transmission signals.

[0092] The reception signal r(k) received by the multi-output receiver through the transmission path (channel) is input to the multi-output equalizer 31 . The signal received by the receiver is converted into a baseband signal and then sampled at one-half symbol period, for example, converted into a digital sig...

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Abstract

The method of the present invention includes: estimating the impulse response hmn(q) of each transmission path based on M received signals rm (m=1,...M) and known signals (the number of users is equal to N, n=1,...N). Determine the M×N matrix H(q) with elements hmn(q) and the Q×Q matrix H with elements H(q) (where Q represents the number of multipaths for each transmitted signal wave and q=0,…, Q-1). The soft decision value b'n(k) is determined based on the decoded λ2[bn(k)], and it is used to generate the interference component matrix B'(k) to generate the interference replica signal H·B'(k). The interfering replica signal H.B'(k) is subtracted from the reception matrix y(k) to determine y'(k). y′(k) and H are used to determine the adaptive filtering coefficient wn(k) applied to the nth user in order to eliminate the residual interference component in y′(k) according to the minimum root mean square criterion. y(k) through wn(k) provides the log-likelihood ratio of the received signal from the nth user with interference removed.

Description

technical field [0001] The present invention relates to a Turbo (fast) (software name) receiving method and a Turbo receiver, which applies iterative equalization to waveform distortions caused by interference using Turbo coding techniques, such as can be used in mobile communications. Background technique [0002] One of the tasks in the mobile station communication service is: how to construct a system that can capture multiple users with high quality in a limited frequency domain. As a measure to solve this problem, a multiple-input multiple-output (MIMO) system is known in the technical field. An example of the system configuration is shown in Figure 30A , where multiple transmitters S1 to SN simultaneously transmit symbols c at the same frequency 1 (i) to c N (i), and the transmitted signal is received by a MIMO receiver equipped with a plurality of antennas #1 to #M. The received signal is processed by the receiver, which evaluates the tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/29H04B1/7115H04B3/06H04B7/005H04J13/00H04L1/00H04L25/02
CPCH04L1/005H04L25/0204H04L25/0236
Inventor 阿部哲士藤井启正富里繁松本正
Owner NTT DOCOMO INC
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