摘要
与正交幅度调制(QAM)相比,差分幅度相移键控(DAPSK)信号的解调方法简单,因而近年来在一些实验正交频分复用(OFDM)系统中得到应用.针对16、32和64阶高阶差分幅度相移键控(MDAPSK),本文详细推导了加性高斯白噪声(AWGN)信道下,采用MDAPSK调制的OFDM(MDAPSK-OFDM)系统的误码性能,得到了MDAPSK-OFDM系统比特差错率(BER)表达式,仿真验证了MDAPSK-OFDM系统的误码性能,并说明了实验系统采用16DAPSK或64DAPSK调制的原因.
Compared with the quadrature amplitude modulation (QAM), the differential amplitude and phase-shift keying (DAPSK) modulation is simpler, especially in demodulation. Therefore, the DAPSK method has recently found many applications in orthogonal frequency division multiplexing (OFDM) systems. This paper evaluates the theoretical performance of the 16-,32- and 64-level multilevel differential amplitude and phase-shift keying (MDAPSK) methods in OFDM systems in terms of the bit-error-rate (BER). This paper presents detailed analysis of the BERs for the MDAPSK-OFDM signals in an additive white Gauss noise (AWGN) channel and obtains closed-form BER expressions. The theoretical results are verified by computer simulations. The computer simulation results reveal the advantages of using the 16DAPSK or 64DAPSK method in experimental OFDM systems.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2004年第6期79-84,共6页
Journal of Beijing University of Posts and Telecommunications
基金
国家"863计划"项目(2001AA121031)
关键词
高阶差分幅度相移键控
正交频分复用
比特差错率
Bit error rate
Computer simulation
Gaussian noise (electronic)
Phase shift keying
Quadrature amplitude modulation
