This work investigates the bit-error-rate (BER) performance of turbo coded orthogonal frequency division multiplexed - offset quadrature amplitude modulated (OFDM- OQAM) signals transmitted through frequency selective Rayleigh fading channels in the presence of carrier frequency offset (CFO) and additive white Gaussian noise (AWGN). The highlight of this work is to use the root raised cosine (RRC) pulse and its Hilbert transform as the complex-valued transmit filter and a simple matched filter at the receiver. The proposed system is similar to single sideband (SSB) modulation, that has roots in analog communications. Turbo code and subcarrier diversity is employed to improve the BER performance over that of an uncoded system. Discrete-time algorithms for frame detection, two-step CFO, channel and noise variance estimation have been proposed. A single transmit and receive antenna is assumed. Similar work has not been done earlier.

翻译：本研究探讨了Turbo编码正交频分复用-偏移正交幅度调制（OFDM-OQAM）信号在存在载波频率偏移（CFO）和加性高斯白噪声（AWGN）的频率选择性瑞利衰落信道中的误码率（BER）性能。本工作的核心在于采用根升余弦（RRC）脉冲及其希尔伯特变换作为复数值发射滤波器，并在接收端使用简单的匹配滤波器。所提出的系统类似于源于模拟通信的单边带（SSB）调制。通过采用Turbo码和子载波分集，系统的BER性能相较于未编码系统得到了提升。本文提出了用于帧检测、两步CFO估计、信道估计及噪声方差估计的离散时间算法。系统假设采用单发射与单接收天线。此前尚未有类似研究。