关键词: LTE-Advanced, 单载波频分多址, 多输入多输出, 信干噪比, 预编码

Abstract: In the uplink of long term evolution (LTE), discrete Fourier transform spread orthogonal frequency division multiplex (DFT-S-OFDM) is used as implementation of single carrier frequency division multiple access (SC-FDMA). In the LTE-Advanced standard, DFT-S-OFDMA will still be used in the uplink to obtain high peak rate and good performance. Single user multiinput multioutput (SU-MIMO) and pre-coding are also used in SC-FDMA uplink. This paper proposes a method to analyze signal-to-interferenceplusnoise ratio (SINR) performance of DFT-S-OFDMA system. A closedform SINR expression based on transmitter-receiver implementation structure and minimum mean square error (MMSE) equalization for receiver is derived by channel frequency response and noise variance. The SINR thus obtained can be applied in adaptive modulation and coding (AMC). Simulation results show that, with the proposed equivalent SINR, the block error rate (BLER) performance of SC-FDMA over slow fading channel is well matched with that over additive white Gaussian noise (AWGN) channel.

Key words: LTE-Advanced, MIMO, pre-coding, single carrier FDMA, SINR