基于迭代分组均衡的SC-FDMA-IDMA非正交多址接入系统

doi:10.3969/j.issn.1000-436x.2014.08.007

Abstract

Abstract:

As a new non-orthogonal multiple-access scheme, SC-FDMA-IDMA combines two technologies of SC-FDMA and IDMA together. This combination makes SC-FDMA-IDMA have the probability to inherit different advantages of these two technologies such as large system capacity, low peak-to-average power ratio (PAPR) and simple multiuser de-tection. However, because SC-FDMA for the transmission of different users' signal is a special form of single carrier modulation, the system performance may degrade quickly when the frequency selectivity of channel is serious. So the it-erative block decision feedback equalization (IB-DFE) algorithm applied to the SC-FDMA-IDMA system is derived in order to enhance the ability of anti-frequency selective fading. Simulation results show that comparing with the sin-gle-user SC-FDMA system with high-order modulation, the multiuser SC-FDMA-IDMA system with low-order modula-tion has great performance improvement after adopting the IB-DFE algorithm on condition that these two systems have the same transmission efficiency.

Key words: SC-FDMA-IDMA, multiuser detection, IB-DFE

De-liang LIU,Qiang HUANG,Da-zhuan XU. Non-orthogonal multiple-access system SC-FDMA-IDMA with iterative block equalization[J]. Journal on Communications, 2014, 35(8): 48-55.

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References 15

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