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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。针对MC-CDMA系统的高峰均功率比的问题,对传统的选择性映射(SLM)算法进行改进。提出一种自适应选择复用帧数的选择性映射系统,在误码率满足一定条件的基础上,通过自适应选择复用帧数的算法选择出最适合系统的复用帧数的个数,使系统在复杂度较低的基础上仍能有效的降低信号的峰均功率比。仿真结果验证其有效性。
Multi-carrier code division multiple access (MC-CDMA) is widely considered as the core technology of 4G communication in the future. However, the peak-to-average power ratio (PAPR) of MC-CDMA signals causes nonlinear distortion and leads to deterioration of bit error rate performance. Aiming at the problem of peak-to-average power ratio of MC-CDMA system, the traditional selective mapping (SLM) algorithm is improved. This paper presents a selective mapping system which adaptively selects the number of multiplexed frames. Based on the condition that the bit error rate (BER) meets certain conditions, the number of multiplexed frames which is most suitable for the system is selected by adaptively selecting the number of multiplexed frames , The system can still reduce the peak-to-average power ratio of the signal effectively on the basis of the lower complexity. Simulation results verify its effectiveness.