Iterative frequency-domain fractionally spaced receiver for zero-padded multi-carrier code division multiple access systems

作者：Yan, Yanxin^*; Gong, Yi; Ma, Maode; Shi, Qinghua

来源：IET Communications, 2014, 8(17): 2993-3000.

DOI：10.1049/iet-com.2014.0233

• code division multiple access
• radio receivers
• least mean squares methods
• multipath channels
• intersymbol interference
• interference suppression
• equalisers
• error statistics
• intercarrier interference
• Doppler shift
• Iterative frequency-domain fractionally spaced receiver
• zero-padded multicarrier code division multiple access system
• minimum mean square error receiver
• MMSE receiver
• MC-CDMA system
• intersymbol interference reduction
• multipath channel
• ISI reduction
• FDFS based equaliser

In this study, the authors propose an improved frequency-domain fractionally spaced (FDFS) minimum mean square error (MMSE) receiver for zero-padded multi-carrier code division multiple access (MC-CDMA) systems when the guard interval is not enough to avoid the inter-symbol interference (ISI) caused by the multipath channel. The proposed novel iterative FDFS-based receivers firstly reconstruct the received symbol to reduce the ISI and then followed by the FDFS-based equalisers to minimise the effect of ISI and inter-carrier interference (ICI) caused by carrier frequency offset (CFO) and Doppler shifts. A few iterations are performed to achieve the expected bit error rate (BER) performance. To reduce the receiver complexity, the novel simplified diagonal FDFS-based receivers with a fixed noise variance are developed with slight performance degradation. The proposed iterative receivers have never been studied in the existing literature. Simulation results show that the proposed iterative FDFS-based receivers can significantly improve the BER performance of the conventional FDFS-MMSE receiver in severe multiple interferences environments caused by multipath, CFO and Doppler shift.

• 出版日期2014-11-27
• 单位南方科技大学