MA-SOQPSK的最大似然接收机和简化接收机  

Viterbi detector and simplified detector for MA-SOQPSK

作　　者：郭兴波[1] 杨知行 潘长勇[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2006年第4期523-526,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(2003AA783021)

摘　　要：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。MA-SOQPSK （multi amplitude-shaped offset quadrature phase-shift keying） modulation using two nonlinear power amplifiers is an ideal candidate for systems with both power and bandwith constraints; however, the detection method is quite complicated which limits its applications. A practical Viterbi detector was developed based on the correlation between two SOQPSK signals in the time domain, with the number of correlators reduced from 128 to 8 without any performance degradation which makes the hardware implementation extremely simple and cost effective. A further simplified Viterbi receiver was then developed based on the averaged waves to reduce the number of correlators to only 4 at the expense of a 1.2 dB penalty.

关 键 词：多幅度调制 非线性功率放大器 相关器 最大似然接收机 成形偏移四相键控 

分 类 号：TN927.2[电子电信—通信与信息系统]