Constant envelope DCT- and FFT-based OFDM systems with continuous phase chirp modulation over fading channels

R. Alsisi, R. Rao
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Abstract

Orthogonal Frequency Division Multiplexing (OFDM) systems with Continuous Phase Chirp Modulation (CPCM) are considered. In these systems, this modulation is used to realize constant envelope OFDM signals. Both Discrete Cosine Transform (DCT)- and Fast Fourier Transform (FFT)-based OFDM systems are considered and their Bit Error Rate (BER) performances over AWGN and fading channels are presented. Expressions for BER over Ricean and Rayleigh channels are derived and illustrated as function of modulation parameters. Results indicate that use of DCT instead of FFT in an OFDM system with CPCM results in better BER performance.
在衰落信道上具有连续相位啁啾调制的恒包络DCT和fft OFDM系统
研究了连续相位啁啾调制(CPCM)的正交频分复用(OFDM)系统。在这些系统中,这种调制被用来实现恒包络OFDM信号。研究了基于离散余弦变换(DCT)和快速傅立叶变换(FFT)的OFDM系统,给出了它们在AWGN和衰落信道下的误码率(BER)性能。推导了riean和Rayleigh信道上的误码率表达式,并以调制参数的函数表示。结果表明,在具有CPCM的OFDM系统中使用DCT代替FFT可以获得更好的误码率性能。
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