SOQPSK (shaping offset quadrature phase shift keying) carrier synchronization method based on pilot frequency and soft information combined assistance

A carrier synchronization and soft information technology, applied in phase modulation carrier systems, baseband system components, etc., can solve problems such as limited range of frequency offset estimation, loss of bit error performance, etc., and achieve the effect of simplifying computational complexity

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

Its shortcoming is that the frequency offset estimation range of this method is limited, and it cannot resist the influence of large frequency offset, and its normalized frequency offset estimation range is only |ΔfT|-4 , w

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  • SOQPSK (shaping offset quadrature phase shift keying) carrier synchronization method based on pilot frequency and soft information combined assistance
  • SOQPSK (shaping offset quadrature phase shift keying) carrier synchronization method based on pilot frequency and soft information combined assistance
  • SOQPSK (shaping offset quadrature phase shift keying) carrier synchronization method based on pilot frequency and soft information combined assistance

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Refer to attached figure 1 , is the short-frame burst SOQPSK communication system applied in this embodiment, including a transmitting end and a receiving end, and the channel model adopts a Gaussian white noise channel with additional carrier frequency offset and phase offset.

[0039] The basic working principle of the system in this embodiment is as follows: at the sending end, a section of pilot sequence is multiplexed and placed in front of the information bit sequence to form a data frame, and the data frame is shaped by SOQPSK Modulation to obtain the baseband complex signal to be sent, and then the transmitted radio frequency signal is obtained after up-conversion; the receiving end system has ideal symbol timing and frame synchronization, and the received radio frequency signal is filtered, down-converted, and digitally sampled to obtain the baseband co...

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Abstract

The invention discloses an SOQPSK (shaping offset quadrature phase shift keying) carrier synchronization method based on pilot frequency and soft information combined assistance, mainly solves the problem in the existing short frame burst communication system carrier synchronization technique that the complexity is high and the carrier deviation estimation range is small. The implementation steps are as follows: firstly, according to pilot frequency assistant maximum likelihood carrier synchronization method, the rough estimation values of carrier frequency deviation and phase deviation are obtained, and the phase rough estimation value is used to revise the receiving signals; then, the frequency deviation one dimensional fine estimation interval, and phase deviation one dimensional fine estimation interval are respectively determined; and in the frequency deviation and phase deviation fine estimation intervals, according to the rule of maximizing the mean square value obtained during demodulation of soft information by SOQPSK, one dimensional search is performed to obtain the precise estimation value of carrier frequency deviation and phase deviation. A small amount of pilot frequency overhead is utilized, large carrier deviation with comparatively low operation complexity is revised, effective carrier synchronization is realized, nearly ideal bit-error performance of coherent demodulation is obtaind, and the method is suitable for the short frame burst communication system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for acquiring synchronous information by using pilot frequency and demodulation soft information in digital communication. The carrier synchronization method is suitable for a SOQPSK short frame burst communication system using shaped offset quadrature phase shift keying, and can be used in military communication, satellite communication, telemetry communication and other fields. Background technique [0002] Short-frame burst communication systems are widely used in military communications, satellite communications, and telemetry communications. The working channels in these fields are both power- and bandwidth-limited channels, and there is a large carrier deviation. Shaped offset quadrature phase shift keying SOQPSK signal is one of the most commonly used modulation methods in the above-mentioned communication field because of its constant envelope and hi...

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Application Information

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IPC IPC(8): H04L27/18H04L25/02
Inventor 孙锦华朱吉利李梦良吴小钧王西玲
Owner XIDIAN UNIV
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