Log-likelihood ratio calculation circuit, reception apparatus, and log-likelihood ratio calculation method

A technology of log-likelihood ratio and calculation circuit, applied in electrical components, digital transmission systems, multiplexing communication, etc., can solve the problem of increasing the amplitude of the transmitted signal, and achieve the effect of suppressing the amount of calculation and the scale of hardware

Inactive Publication Date: 2018-11-09
MITSUBISHI ELECTRIC CORP
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  • Application Information

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Problems solved by technology

[0003] Although DPC achieves excellent performance in theory, there is a problem that the amplitude of the transmitted signal after the subtraction is increased because the processing of subtracting the interference signal from the transmitted signal is performed on the transmitting side

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  • Log-likelihood ratio calculation circuit, reception apparatus, and log-likelihood ratio calculation method
  • Log-likelihood ratio calculation circuit, reception apparatus, and log-likelihood ratio calculation method
  • Log-likelihood ratio calculation circuit, reception apparatus, and log-likelihood ratio calculation method

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Embodiment approach 1

[0040] figure 1 It is a diagram showing a configuration example of the communication system according to Embodiment 1 of the present invention. Such as figure 1 As shown, the communication system of this embodiment includes a transmitting device 10 and a receiving device 20 . A signal transmitted from the transmitting device 10 is received by the receiving device 20 via the transmission path 30 . The signal received by the receiving device 20 generally has interference, that is, an interference signal, and noise added to the transmission path 30 .

[0041] Such as figure 1 As shown, the transmitting device 10 includes an error correction coding unit 11 , a QAM modulation unit 12 , an interference subtraction unit 13 and a modulus (modulo) calculation unit 14 . The error correction coding unit 11 performs error correction coding on transmission bits, which are information to be transmitted. Any code can be used as the error correction code, for example, a convolutional cod...

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Abstract

An LLR calculation unit is provided with: a range detection unit (211) that detects which range a reception signal after a modulo operation falls in among a plurality of ranges determined on the basisof a boundary value in the modulo operation; a coefficient determination unit (212) that determines, on the basis of a detection result from the range detection unit (211), coefficients to be used incalculation of a log-likelihood ratio of the most significant bit in quadrature amplitude modulation of the reception signal after the modulo operation; and an LLR computation unit (213) that computes the log-likelihood ratio of the most significant bit using the reception signal after the modulo operation and the coefficients.

Description

technical field [0001] The invention relates to a logarithm likelihood ratio calculation circuit, a receiving device and a logarithm likelihood ratio calculation method in a digital communication system. Background technique [0002] In digital communication, when the interference signal applied to the received signal is known or can be estimated, by applying a non-linear pre-processing technology called DPC (Dirty Paper Coding) on ​​the transmission side, it is possible to achieve the same The same signal transmission as in the case of no interfering signal. The theory of DPC is disclosed in Non-Patent Document 1. [0003] Although DPC achieves excellent performance in theory, there is a problem that the amplitude of the transmitted signal after the subtraction is increased because the processing of subtracting the interference signal from the transmitted signal is performed on the transmitting side. On the other hand, Non-Patent Document 2 and Non-Patent Document 3 discl...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04J99/00H03M13/45H04B7/04H04L27/38
CPCH04L25/067H04L25/4975H04L27/38H03M13/45H04B7/04H03M13/1111H04B7/0413
Inventor西本浩
OwnerMITSUBISHI ELECTRIC CORP