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Incoherent soft-output detection method based on continuous phase modulation

A detection method and phase modulation technology, applied in the field of communications, can solve the problems of increased cost and high detection complexity, and achieve the effects of improving performance, reducing computational complexity, and reducing detection complexity.

Inactive Publication Date: 2012-07-18
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that as the length of the observation interval increases, the performance improves and the complexity increases exponentially, and this method can only be applied to binary continuous phase modulation systems. For high-order modulation systems, the overly complex method greatly increases the cost of the system
Although this method adopts the two-way Viterbi method, its detection complexity is still too high

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  • Incoherent soft-output detection method based on continuous phase modulation
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  • Incoherent soft-output detection method based on continuous phase modulation

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Embodiment Construction

[0021] refer to figure 1 , the implementation steps of the present invention are as follows:

[0022] Step 1, define the number of states at each receiving moment in the trellis diagram of the bidirectional Viterbi detection method as M Q , each state is expressed as: s=[a k-Q , a k-Q+1 ,...,a k-1 ], where Q is a natural number, a k Indicates the input symbol at the kth moment, a k ∈{0, 1,...M-1}, k ∈ {1, 2,...N}, M represents the size of the input symbol set, and N represents the symbols received by one detection process of the bidirectional Viterbi detection method number.

[0023] Step 2, before the symbol is received, set the receiving time at this time as the time when the 0th symbol is received, and set the state s in the grid diagram corresponding to this time 0 The forward metric of =[0, 0, ..., 0] is a constant c, c>>1, the forward metric of other states is 0, and the forward cumulative phase at the moment of receiving the 0th symbol is set to be 0, the phase ...

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Abstract

The invention discloses an incoherent soft-output detection method based on continuous phase modulation system, and mainly overcomes the defects that the existing incoherent detection is high in complexity and insufficient in detection performance. The method is implemented through the following steps: (1) defining state representations in a grid chart; (2) setting a moment before receiving as a moment receiving the zeroth symbol, and carrying out forward initialization on all states at the current moment; (3) sequentially carrying out forward updating from a moment receiving the first symbol to a moment receiving the Nth symbol in an ascending mode; (4) after the forward updating is completed, carrying out backward initialization on all states at the moment receiving the Nth symbol; (5) sequentially carrying out backward updating from a moment receiving the (N-1)th symbol to a moment receiving the zeroth symbol in a descending mode; and (6) after the forward updating and the backward updating are completed, merging prior information of a forward metric, a backward metric, a branch metric and input symbols, and outputting soft information. The method disclosed by the invention can be applied to the detection of an uncoded system and the simultaneous iterative detection in a serial concatenated system.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a non-coherent soft output detection method based on continuous phase modulation (CPM, Continuous Phase Modulation). It can be used for the detection of uncoded systems and iterative signal detection of coded and modulated systems. Background technique [0002] Continuous phase modulation is a kind of high-efficiency coding and modulation technology widely used in the field of wireless communication. It has the characteristics of constant envelope and continuous change of carrier phase, and can achieve high power efficiency and spectrum utilization at the same time. For continuous phase modulated signals, the receiver can use coherent or non-coherent detection methods. The best coherent detection is the Viterbi Algorithm, but coherent detection using this method requires complete synchronization of the transmitting and receiving carriers, and the detection delay and ...

Claims

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Application Information

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IPC IPC(8): H04L27/233
Inventor 白宝明黎昞王珏黄梦羽袁瑞佳王雪鹏郑贱平
Owner XIDIAN UNIV
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