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Method and device for detecting signal under multipath channel

A signal detection and channel technology, applied in the field of communication, can solve problems such as bit error rate reduction, and achieve the effect of reducing bit error rate

Active Publication Date: 2012-05-16
ZTE CORP
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  • Claims
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Problems solved by technology

[0024] The main purpose of the present invention is to provide a signal detection method and device under a multipath channel to at least solve the problem that the bit error rate of the above-mentioned system cannot be reduced following the improvement of the signal-to-noise ratio

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  • Method and device for detecting signal under multipath channel
  • Method and device for detecting signal under multipath channel
  • Method and device for detecting signal under multipath channel

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Embodiment Construction

[0039] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0040] Before describing the technical solutions provided by the embodiments of the present invention, the proposal of the technical solutions of the embodiments of the present invention will be described first.

[0041] Under the condition of high signal-to-noise ratio, suppose a modulation coding block just includes H max and H min frequency point. Denote these two frequency points as A0, A1. Then the likelihood distance between these two frequency points can be expressed as:

[0042] SI max = - | | H max | ...

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Abstract

The invention discloses a method and device for detecting a signal under a multipath channel, wherein the method comprises the following steps of utilizing a received signal of a channel estimation value and a baseband frequency domain, and obtaining a likelihood distance of the received signal according to a maximum A posteriori criterion; taking the quotient of the square root result of modular squaring of the likelihood distance and the channel estimation as soft information; and taking one modulation encoding block as a unit, intercepting high n bit after performing uniform shift scaling for the soft information, and inputting the intercepted high n bit in a given and fixed point bite decoder, wherein n is the bit number of the input parameters including sign bits of the bit decoder. With the adoption of the method and the device provided by the invention, error code rate of the soft information output by the fixed point soft demodulator can be reduced.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a signal detection method and device in a multipath channel. Background technique [0002] Modulation and demodulation technology is divided into analog modulation and demodulation and digital modulation and demodulation. The analog modulation technology is the frequency domain shift of the signal, and the coherent demodulation and non-coherent demodulation methods can be used to restore the modulated signal. Digital modulation uses the principle of signal detection to design the transmitted signal for detection at the receiving end. The digital modulation signal can be detected and restored by a certain principle of signal detection. [0003] Among them, the digital demodulation technology is divided into two methods: hard demodulation and soft demodulation. Hard demodulation is a method of directly deciding the transmitting constellation according to the received signal and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02H04L27/38
CPCH04L25/03171H04L1/0045
Inventor 严妙奇张玉杰
Owner ZTE CORP
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