Method and device for obtaining equivalent received signal, maximum likelihood detection method

Abstract

The invention provides a method of acquiring an equivalent receiving signal and a device thereof. The method comprises the following steps of acquiring a receiving signal, wherein the receiving signal includes a plurality of modulation signals which are interfered by a channel and a noise, the plurality of modulation signals are modulated by a plurality of source signals, and the channel is expressed by a channel coefficient; acquiring expected values of the other modulation signals in the plurality of modulation signals, except for a last modulation signal, wherein the last modulation signal is the modulation signal corresponding to a last source signal; carrying out interference offset processing on the receiving signal according to the expected value of the other modulation signals and the channel coefficient; and based on the receiving signal after interference offset, acquiring an equivalent receiving signal of the last modulation signal. The method of acquiring the equivalent receiving signal can be compatible with a maximum likelihood detection method used for demodulating the signal and can be used to reduce a computation complexity of the maximum likelihood detection method and reduce power consumption of a receiving terminal.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for obtaining an equivalent received signal, and a maximum likelihood detection method. Background technique [0002] In the modulation and demodulation technology, multiple binary signals are respectively modulated according to a constellation diagram, wherein the constellation diagram includes: QPSK, 16QAM, 64QAM, 256QAM and so on. It should be noted that each constellation diagram includes a group of constellation points, and each constellation point in a group is represented by multiple bits. For example, QPSK has a set of four constellation points 00, 01, 10, and 11, and each constellation point includes two bits; 16QAM includes a set of 16 constellation points, and each constellation point includes four bits; 64QAM includes a set of 64 Constellation points, each constellation point includes six bits. [0003] As an example, at the sendin...

AI Technical Summary

Problems solved by technology

When the modulation order of the transmitted modulation signal is high, such as 64QAM or 256QAM, the computational complexity of obtaining LLR will be very high, and a large number of Euclidean distances need to be calculated, resulting in an increase in power consumption at the receiving end

In addition, the calculation process of the existing QRM method is fixed and lacks the flexibility of adjustment

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