SC-FDMA-IDMA: A Hybrid Multiple Access Scheme for LTE Uplink

According to OFDM-IDMA suffers a peak-to-average power ratio (PAPR) problem, in this paper, we propose a hybrid multiple access scheme for LTE uplink, which combines IDMA and SC-FDMA (Single Carrier Frequency Division Multiple Access), named as SC-FDMA-IDMA. This hybrid multiple access scheme inherits many attractive features of SC-FDMA and IDMA. We discuss the performance comparison of SC-FDMA-IDMA and OFDM-IDMA. Moreover, the BER performance of different subcarrier mapping schemes for SC-FDMA-IDMA is also investigated. Simulation results show that SC-FDMA-IDMA performs better than OFDM-IDMA in PAPR for LTE uplink, and its BER performance is close to OFDM-IDMA.