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基于多个非线性功率放大器的M A-SOQPSK(m u lti-am p litude-shaped offset quadrature phase-sh iftkey ing)调制具有很高的功率效率和频谱效率,但是其最大似然接收机非常复杂。该文利用两路SOQPSK波形的时域相关性,提出了一种简单的最大似然接收机,在不降低接收性能的前提下,将相关器从128个减少到8个。仿真结果表明该最大似然接收机的误比特率性能仅比16 QAM(quadrature am p litude m odu lation)的恶化0.6 dB。进一步简化的接收机用平均波形代替相似的SOQPSK波形,将相关器进一步减少到4个,并用2个简单的4状态维特比译码器代替一个复杂的16状态维特比译码器,仿真表明该简化接收机的误比特率性能比最大似然接收机的恶化1.2 dB。仿真和分析表明,M A-SOQPSK的功率效率要高于QAM。
Mu Ati-Am p litude-shaped offset quadrature phase-shift modulation based on multiple non-linear power amplifiers has high power efficiency and spectral efficiency, but its maximum likelihood receiver is very complicated. In this paper, a simple maximum likelihood receiver is proposed based on the time domain correlation of two SOQPSK waveforms. The correlator is reduced from 128 to 8 without degrading the receiving performance. Simulation results show that the maximum bit error rate receiver performance is only 0.6 dB worse than 16 QAM (quadrature amplitude modulation). A further simplified receiver replaces a similar SOQPSK waveform with an averaged waveform, further reducing the correlator to four, and replaces a complex 16-state Viterbi decoder with two simple 4-state Viterbi decoders. Simulation shows that the The bit error rate performance of the simplified receiver is 1.2 dB worse than the maximum likelihood receiver. Simulation and analysis show that the power efficiency of M A-SOQPSK is higher than that of QAM.