一种新的相位序列在选择性映射中的应用

正交频分复用（OFDM）和多载波码分多址（MC-CDMA）被广泛认为是未来4G通信的核心技术。但是,OFDM和MC-CDMA信号的高峰均功率比（PAPR）会引起非线性失真并导致误码率性能恶化,这已成为它们实用化的最大障碍。选择性映射（SLM）是一种能有效地降低系统PAPR方法,其中相位序列的选择直接影响降低PAPR的效果。提出将一种新的伪随机扰码作为选择性映射中的相位序列来降低OFDM和MC-CDMA系统的PAPR,仿真得出这种伪随机扰码序列能有效地降低系统的PAPR,且优于传统Walsh-Hadamard、Golay序列。

Application of a New Phase Sequence in SLM

OFDM and MC-CDMA are considered as the core technologies for future 4G wireless communications, and however, the high peak-to-average power ratios （PAPRs） of OFDM and MC-CDMA signals would lead to nonlinear distortion and degradation of BER （BER）performance, thus become the obstacles for practical applications of OFDM and MC-CDMA.Selected Mapping （SLM） is an effective method for reducing PAPR, in which the selection of phase sequence has direct influence on the reduction of PAPR. Thus a new pseudo-random interferometry code is proposed as the phase sequence in SLM for reducing PAPR of OFDM and MC-CDMA. The simulation results show that the proposed sequence could effectively reduce PAPR, and is much better than Walsh-Hadamard, Golay sequence.