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Reduced bitstream candidate based receiver and received signal processing method

A receiver, bit stream technology, applied in multi-carrier systems, other decoding technologies, etc., can solve the problems of reducing the accuracy of likelihood estimation and not fully reflecting the advantages of soft input decoders

Inactive Publication Date: 2006-01-04
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] If the likelihood is computed using a metric of unreliable bit patterns, the precision of the likelihood estimation will be degraded, and the benefits of the subsequent soft-input decoder will not be fully reflected

Method used

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  • Reduced bitstream candidate based receiver and received signal processing method
  • Reduced bitstream candidate based receiver and received signal processing method
  • Reduced bitstream candidate based receiver and received signal processing method

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Embodiment Construction

[0049] The basic structure of the invention is that the set of candidate bitstreams that have been reduced by the reduced candidate bitstream estimator is further screened to select only those bit patterns with high reliability (indicated by the metric value). A metric representing reliability information is used as a screening criterion, and those bit patterns whose metric exceeds a prescribed threshold are selected for subsequent likelihood estimation. It is also possible to use the threshold for selecting the metric as a fixed substitute value for use in cases where there is no metric corresponding to a bit "0" or a bit "1" in the subsequent likelihood estimation.

[0050] By adopting this structure, only reliable candidate bitstreams are selected from the reduced number of candidate bitstreams, and the likelihood is calculated based on the selected candidate bitstreams and related reliability information. Therefore, signal reception characteristics are improved.

[0051] ...

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Abstract

A receiver comprises multiple receiving antennas configured to receive bitstreams transmitted from multiple transmission antennas; a bitstream candidate estimator configured to estimate a prescribed number of bitstream candidates among possible combinations of the received bitstreams and to calculate reliability information for each of the candidates; a bit-based estimator configured to produce a bit-based estimation result for each bit of the transmitted bitstreams based on the estimated candidates and the associated reliability information, the bit-based estimation result being adjusted by an adjusting criterion determined by the reliability information; and a decoder configured to decode the transmitted bitstreams based on the adjusted bit-based estimation result.

Description

technical field [0001] The present invention relates generally to multiple-input multiple-output (MIMO) receivers for high-rate wireless transmission, and more particularly to a receiver based on downscaling candidate bitstreams configured to downscale and screen ) candidate bit streams of the transmitted signal, so as to estimate the likelihood (likelihood) of each bit according to the screened candidate bit streams. Background technique [0002] In recent years, techniques for realizing high-rate and high-quality wireless transmission have been proposed. Such techniques include error-correcting coding, multi-level modulation (such as 16QAM or 64QAM), and space-division multiplexed transmission using multiple transmit antennas. [0003] 1A and 1B are schematic block diagrams of a transmitter with multiple transmit antennas and error correction and multilevel modulation functions. In the example shown in FIG. 1A, a transmission bit stream is encoded by an encoder 110, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38H03M13/39
Inventor 阿部哲士藤井启正吉野仁
Owner NTT DOCOMO INC