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中文摘要：
提出了一种适用于TDD上行链路的基于预均衡和正交循环码的M元MC-CDMA系统．各移动用户使用正交循环码进行M元扩频，降低了选码的难度．由于上行链路的M元MC-CDMA信号在传输前经过了预均衡处理，使得各用户信号在到达基站后能够保持良好的正交性．在将基站接收信号分别与各用户原型扩频码镜像序列的OFDM调制结果相乘后，利用OFDM解调器可同时完成M元解扩和多载波解调．研究结果表明，本系统的频带利用率和计算复杂度均优于传统的M元MC-CDMA系统．
英文摘要：
A novel M-ary MC-CDMA system in uplink TDD mode is proposed based on orthogonal cyclic codes and pre-equalization. At the transmitter, every mobile user uses the orthogonal cyclic codes as spreading codes, which reduces the spreading codes selection difficulty of the M-ary MC-CDMA system. In order to keep a good orthogonal characteristic among all users＇ signals, a pre-equalizer is employed to process the M-ary MC-CDMA signal before being transmitted. The received signal is multiplied by the local sequence, and then the proposed scheme achieves the M-ary despread spectrum and OFDM demodulation at the same time. The results show that the proposed scheme has better bandwidth efficiency and lower computation complexity than traditional M-ary MC-CDMA systems.
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