SOQPSK-TG信号的简化状态解调器

doi:10.3969/j.issn.1001-2400.2014.05.001

Abstract

Abstract:

To solve the problem of high complexity in the demodulator for a partial-response version of shaped-offset quadrature phase-shift keying(SOQPSK-TG), a simplified two-state demodulator for non-recursive SOQPSK-TG using the survivor path is proposed based on the decision feedback simplified demodulator of recursive SOQPSK-TG. First, a two-state trellis is deduced by proper state merging based on the four-state trellis of non-recursive SOQPSK-TG. Then, the simplified two-state trellis is used as the state transition trellis in the receiver to demodulate the received signal, and during the demodulation the hypothesized signal of each branch is obtained via the survivor path. Simulation results show that non-recursive SOQPSK-TG has a better performance than recursive SOQPSK-TG in the low SNR region, and the simplified two-state demodulator of non-recursive SOQPSK-TG has 0.5～1.0dB SNR degradation compared with the four-state demodulation algorithm; however the low computation complexity is beneficial to engineering application.

Key words: shaped offset quadrature phase-shift keying, non-recursive, decision feedback, complexity reduction

CLC Number:

TN911.3

SUN Jinhua;HAN Huimei;ZHU Jili. Reduced state demodulator for the SOQPSK-TG signal[J].J4, 2014, 41(5): 1-6+12.

References

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Reduced state demodulator for the SOQPSK-TG signal

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