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Method for estimating channel quality of continuous phase modulation self adaptive frequency-hopping system

A technology of channel quality estimation and phase modulation, applied in the field of communication

Inactive Publication Date: 2006-03-22
XIDIAN UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to provide a channel quality estimation method for an adaptive frequency hopping system with continuous phase modulation, so as to solve the problem that the adaptive frequency hopping communication system adopting the CPM system can effectively distinguish the current channel during the communication process after the frequency hopping synchronization is established. The problem of the degree of channel interference

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[0076] The channel quality estimation process and effect simulation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0077] In this embodiment, the standard reference CPM signal is quaternary, the modulation index is 0.25, the impulse response is a raised cosine pulse lasting one symbol, and the baud rate is 24KBd. According to the threshold setting rule that the average phase distance of the received signal is the standard reference CPM signal at the critical point of the communicable signal-to-noise ratio, the bit error rate under the Gaussian white noise channel is stipulated to be less than 10 -2 The signal-to-noise ratio at the time is the communicable signal-to-noise ratio. For a standard reference signal with a quaternary system, a modulation index of 0.25, and an impulse response of a raised cosine pulse that lasts for one symbol, the bit error rate is 10 -2 The bit signal-to-noise ratio corresponding to ...

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Abstract

This invention discloses a channel quality estimation method for continuous phase modulation self adapting frequency hopping system through referencing the extent of CPM modulation signal interfered by other signal in communication, which contains first accounting the received signal phase in one code element time and phase of standard reference signal, then accounting the phase distance between received signal and standard reference signal, finding out minimal phase distance in all signal phase possible being transmitted, taking the average value, comparing the average value with set threshold value to judge the frequency point quality. Said invention can self adaptively select optimized channel to make frequency hopping communication for keeping the communication system in fine communication state.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to channel quality estimation of an adaptive frequency hopping communication system, specifically a method for estimating channel quality based on a continuous phase modulation adaptive frequency hopping system. Inferior, adaptively select a good channel set for frequency hopping communication, so that the communication system maintains a good communication state. Background technique [0002] In a conventional frequency hopping system, the frequency hopping patterns of both the transmitting and receiving parties are agreed in advance, and the hopping is performed synchronously according to the frequency hopping pattern. With the intensification of electronic countermeasures in modern warfare, limited spectrum resources lead to mutual interference between communication devices. On the basis of conventional frequency hopping, adaptive frequency hopping is proposed, which increase...

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Application Information

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IPC IPC(8): H04L25/02H04L27/20H04B1/713H04B1/7156
Inventor 孙锦华金勇李建东金力军吴小钧
Owner XIDIAN UNIV
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