Two-state Viterbi detection system and method

Abstract

The present invention provides a two-state Viterbi detection system and method. The system comprises a time domain to frequency domain conversion module for converting an inputted time domain sample point signal into a frequency domain sample point signal, a difference judgment module for obtaining a judgment bit and a judgment variable, a phase error calculation module for calculating errors to obtain judgment error variables, a frequency domain two-state Viterbi module for carrying out the combined detection of the multiple judgment error variables and obtaining corrected judgment error variable values, a cache module for storing the judgment bit so as to match the processing time delay introduced by the frequency domain two-state Viterbi module, and a judgment bit correction module which corrects the judgment bit by using the corrected judgment error variables. The system and the method have the advantages that good detection performance can be obtained, the system complexity can be reduced, and the system and method are not sensitive to an h value, a frequency shift, a phase, a matched filter, and other factors.

Description

technical field [0001] The invention belongs to the technical field of sequence detection, and in particular relates to a two-state Viterbi detection system and method. Background technique [0002] The demodulation technology of the communication system is generally divided into coherent demodulation and non-coherent demodulation. Coherent demodulation usually requires the receiver to recover the carrier frequency and carrier phase first, and then use channel estimation technology and equalization technology to demodulate, recover and judge the received signal. However, it is usually difficult for the receiver to obtain the same frequency and phase. The non-coherent demodulation technology does not require the receiver to achieve the same frequency and phase, so it is relatively easy to implement, but the demodulation performance of the non-coherent demodulation technology is usually worse than that of the coherent demodulation technology. [0003] At present, continuous ...

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Problems solved by technology

[0010] The complexity of this scheme is acceptable, but this scheme is very sensitive to carrier frequency offset and phase, requires high estimation accuracy, and is also sensitive to matched filters, requiring careful design of matched filters

[0011] In short, the above three representative Viterbi schemes all work in the time domain, with high complexity or sensitivity to factors such as modulation index value, frequency offset, phase, and matched filter.

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