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Decision feedback fraction multi-bit differential detection method based on continuous phase signal

A decision feedback and detection method technology, applied in mobile communication, can solve the problems of reducing system bit error rate performance, coherent demodulation performance gap, serious interference, etc., and achieve the effect of reducing inter-symbol interference, eliminating influence and stable performance

Inactive Publication Date: 2012-07-04
XIDIAN UNIV
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Problems solved by technology

However, there is still a certain gap between this and the coherent demodulation performance. Due to the introduction of the Gaussian filter, the interference of the known symbols to the current symbol is still relatively serious, which reduces the bit error rate performance of the entire system.

Method used

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  • Decision feedback fraction multi-bit differential detection method based on continuous phase signal
  • Decision feedback fraction multi-bit differential detection method based on continuous phase signal
  • Decision feedback fraction multi-bit differential detection method based on continuous phase signal

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[0041] The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0042] refer to figure 2 , this example takes B b T=0.5, k m =π / 2T, k=1 / 4, the input signal of pulse extension length is 3T. The detection of the signal is realized by the software of the signal processor.

[0043] In this embodiment, the digital signal processing method needs to discretize the time. In this embodiment, each symbol interval T takes 4 sampling points, and in the process of signal detection, it takes Λ=5. The specific steps are as follows:

[0044] The first step is to perform λkT symbol delay and 90° phase shift on the received signal x(t), and the differential signal after time delay and phase shift is obtained as:

[0045] x(t-λkT) 90° =R(t-λkT)cos(2πf c (t-λkT)+φ(t-λkT,α)+η(t-λkT)+90°) (7)

[0046] In the formula,

[0047] R ( t ...

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Abstract

The invention discloses a decision feedback fraction multi-bit differential detection method based on a continuous phase signal, belonging to the technical field of communication and mainly solving the problem that intersymobl interference caused by a known code element influences the performance of a system in the traditional method. The method comprises the following realization steps of: firstly, carrying out phase translation and time delay on each branch of a received signal to obtain a differential signal; then multiplying the differential signal by the received signal to realize differential detection after carrying out decision feedback on the differential signal; finally merging signals of all branches, and sampling and judging to obtain a sending code element. On the premise of ensuring the utilization ratio of a frequency spectrum, the invention reduces the interference of the known code element to current code element and improves the error rate performance of the whole system, thereby realizing the reliable information transmission and being used for signal detection of the continuous phase signal through a transmission channel.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to signal detection in digital communication, in particular to a method for detecting continuous phase signals, which can be used in mobile communication, satellite communication, deep space communication and other fields. Background technique [0002] In modern communication, with the development of large-capacity and long-distance digital communication technology, traditional digital modulation methods can no longer meet the requirements of applications, and more efficient digital modulation methods are required to reduce channel bandwidth and nonlinearity of transmission signals. impact in order to obtain better performance under the condition of limited bandwidth resources. Continuous Phase Modulation CPM (Continuous Phase Modulation) is an advanced modulation technique with constant envelope, which has efficient frequency band utilization and power utilization. Due to its ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/233
Inventor 孙锦华王立君吴小均
Owner XIDIAN UNIV
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