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Method and device for obtaining log-likelihood ratio

A technology of log-likelihood ratio and acquisition method, applied in the field of log-likelihood ratio acquisition method and device, can solve the problems of signal co-channel interference, low communication efficiency and the like

Active Publication Date: 2016-02-17
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
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Problems solved by technology

[0006] The problem solved by the invention is that there is co-channel interference in the signal in the wireless communication system, and the communication efficiency is low

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  • Method and device for obtaining log-likelihood ratio
  • Method and device for obtaining log-likelihood ratio

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Embodiment Construction

[0058] In the prior art, signals in a wireless communication system have co-channel interference and low communication efficiency. Taking IEEE802.11g as an example, since the frequency band of IEEE802.11g is located in the 2.4GHz ISM frequency band, in addition to IEEE802.11g signals, there are Bluetooth (BT, BlueTooth) signals and microwave oven signals equivalent to adjacent frequency bands. Jamming signal. These adjacent frequency interference signals and IEEE802.11g signals are superimposed on each other, which will cause the signal receiver to fail to correctly demodulate using the OFDM modulated signal frame of the IEEE802.11g protocol.

[0059] For the frame structure of the modulated signal frame of OFDM using the IEEE802.11g protocol, please refer to figure 1 , in an OFDM modulated signal frame, each OFDM symbol has 64 data subcarriers. The OFDM modulated signal frame includes an STF field, an LTF field, a SIGNAL field and a DATA field.

[0060] The STF (Short Trai...

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Abstract

The invention relates to a method and device for obtaining a log-likelihood ratio, and aims to obtain log-likelihood values of various bits of a data sub-carrier in an OFDM modulation signal frame. The method comprises the following steps: obtaining an interference variance of the data sub-carrier; and obtaining the log-likelihood values of various bits of the data sub-carrier according to the interference variance of the data sub-carrier, a channel estimation coefficient corresponding to the data sub-carrier and a QAM symbol mapped by the data sub-carrier. By means of the method, same-adjacent-frequency interference signals can be effectively resistant when an OFDM signal is received; and thus, the receiving performance of a receiver can be improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for acquiring a logarithmic likelihood ratio. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology is a digital multi-carrier modulation scheme using a large number of densely arranged orthogonal subcarriers, and each subcarrier is individually adjusted by using a conventional modulation technique. Including quadrature amplitude modulation technology (QAM, Quadrature Amplitude Modulation), the QAM is a modulation method for performing amplitude modulation on two orthogonal carrier waves. [0003] OFDM and QAM technologies are often applied in wireless communication systems to improve the anti-interference capability of the communication system. When demodulating OFDM modulated signals in the communication system, Viterbi (Viterbi) decoding can be used. Viberbi dec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 谢鑫
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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