Channel Equalization and Chunk Assignment Schemes for LTE SC-FDMA Systems in Multipath Channels
Single-carrier frequency division multiple access (SC-FDMA) has been selected as the key air interface for uplink transmission in long-term evolution (LTE) specifications.This paper proposes two kinds of minimum mean square error (MMSE)- based equalizers to compensate for the inter-carrier interference (ICI),resulting from the Doppler effect in multipath time-variant channels.The equalizers are designed from the multi-user (MU) and single-user (SU) perspectives.The MU-MMSE equalizer can achieve better performance than the SU-MMSE equalizer,but it has higher computational complexity.Alternatively,the SUMMSE equalizer which applies the band-limited structure of the ICI matrix is proposed to efficiently reduce the computational complexity at the sacrifice of slight performance degradation on bit error rate (BER).We also develop an iterative receiver by incorporating the ICI cancellation scheme into the SU-MMSE equalization scheme to enhance the BER performance,and propose an interweaving chunk assignment scheme for mobile users with different vehicle speeds.Simulation results show that the proposed scheme can effectively improve the LTE uplink SCFDMA system performance in multipath time-variant channels.
Long-termevolution single-carrier frequency divisionmultipleaccess channel equalization chunkassignment
Meng-Lin Ku Huan-Jung Yeh
Department of Communication Engineering,National Central University,Taiwan, R.O.C
国际会议
2012 IEEE 14th International Conference on Communication Technology(2012年第十四届通信技术国际会议(ICCT 2012))
成都
英文
1258-1263
2012-11-09（万方平台首次上网日期，不代表论文的发表时间）