Incoherent detection technology suitable for DMR digital trunking communication system

Abstract

The invention belongs to the field of wireless communication and relates to an incoherent detection technology suitable for a DMR (Digital Mobile Radio) digital trunking communication system. Firstly, defects of both a conventional incoherent detection technology and an existing multiple symbol detection algorithm are analyzed in detail; then according to the maximum likelihood ratio criterion, an incoherent multiple symbol detection algorithm suitable for a 4-CPFSK (Continuous Phase Frequency Shift Keying) signal in a DMR standard frame is disclosed; and simultaneously, a decomposed linear signal replaces an original reference signal to simplify the structure of a receiver. The receiver corresponding to the algorithm disclosed by the invention is formed by three front-end matched filters and a following viterbi operational part and the complexity of the receiver is effectively reduced. When the calculation of the branch metric is carried out, the judgment accuracy is improved by utilizing information of a plurality of pieces of code element time. A computer simulation result in the Matlab environment proves that with the increase of observing windows, the performance of detecting the 4-CPFSK signal of the algorithm disclosed by the invention gradually becomes better.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a non-coherent detection technology applicable to a DMR digital trunking communication system. Background technique [0002] DMR (Digital Mobile Radio) digital trunking communication standard is an open standard designed and formulated by ETSI (European Telecommunications Standards Institute) to meet the mobile communication needs of low-end professional and commercial users in European countries. DMR has the advantages of efficient use of spectrum resources, regional system networking, and compatibility with analog routines. Its business functions are rich, scalable, and backward compatible. At the same time, the system and terminal costs are low, the network construction speed is fast, and the overall operating cost is low. Compared with the two mature digital standard products of TETRA and APCO25, it has the advantages of cheap price and low technical complex...

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to solve the problem that 4-CPFSK signal coherent detection is difficult to realize under the DMR digital trunking system standard, and the traditional non-coherent detection performance is relatively poor. A non-coherent multi-symbol detection technology suitable for the standard 4-CPFSK signal is proposed. At the same time, a linear model of the multi-ary signal is introduced into the algorithm to overcome the complexity of the existing multi-symbol detection receiver with the partial response length and Issue with exponential growth of multi-symbol watch windows

Images