Simulation of OQPSK in AWGN and Frequency-Selective Fading Channels

This paper aims to investigate the performance of OQPSK through simulations in AWGN and frequency-selective fading channels. First, we introduce OQPSK modulation technique and its applications in wireless communication systems, including the implementation of offset quadrature modulation where the in-phase and quadrature components are staggered by half a symbol period. Next, we detail the characteristics and influencing factors of AWGN and frequency-selective fading channels, with emphasis on modeling approaches such as using additive white Gaussian noise functions and implementing multipath channel models with delay profiles and Doppler effects. We then evaluate OQPSK performance under these channel conditions through simulation experiments, measuring key indicators like bit error rate (BER) and symbol error rate (SER). The simulation implementation typically involves generating random data streams, applying OQPSK modulation, channel modeling with noise and fading effects, demodulation processing, and error calculation algorithms. Finally, we analyze experimental results and discuss potential optimization methods, including equalization techniques and diversity combining schemes. Through this research, we aim to better understand OQPSK behavior in AWGN and frequency-selective fading channels, providing references for wireless communication system design and optimization. The simulation framework can be implemented using programming languages like MATLAB or Python with digital communications libraries for modulation, channel modeling, and performance analysis functions.