一种高频带利用率的PCSS-OFDM通信技术

为了提高扩频OFDM通信系统的频带利用率,提出了一种将并行组合扩频技术和OFDM技术相结合的并行组合扩频OFDM通信系统.对该系统进行了理论分析和建模仿真,并和频域扩频多载波CDMA系统进行了对比.结果表明,在高斯白噪声信道下,并行组合扩频OFDM系统不仅具有较高的频带利用率,而且在信噪比较大时可靠性优于频域扩频多载波CDMA系统;在多径衰落信道下,尽管并行组合扩频OFDM系统的可靠性比频域扩频多载波CDMA系统差,但是在一定程度上提高了系统频带利用率.

A PCSS-OFDM communication technology with high band efficiency

In order to improve the band efficiency of spread spectrum orthogonal frequency division multiplexing （OFDM） system, a parallel combinatory spread spectrum orthogonal frequency division multiplexing （PCSS OFDM） system, which combined both PCSS and OFDM technologies, was proposed. In addition, the theoretical analysis and modeling simulation was performed for the proposed system, and the comparison with the domain spread spectrum multicarrier code division multiple access （MC CDMA） system was carried out. The results show that in the Gaussian white noise channel, the PCSS OFDM system has not only higher band efficiency, but also better reliability compared with the domain spread spectrum MC CDMA system when the signal to noise ratio is relatively high. In the multipath fading channel, though the reliability of PCSS OFDM system is worse than that of domain spread spectrum MC CDMA system, the band efficiency gets improved to some extent in the PCSS OFDM system. 