Iterative frequency‐domain fractionally spaced receiver for zero‐padded multi‐carrier code division multiple access systems
| Autor: | Yi Gong, Maode Ma, Yanxin Yan, Qinghua Shi |
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| Rok vydání: | 2014 |
| Předmět: |
Multi-carrier code-division multiple access
Minimum mean square error Code division multiple access Computer science Real-time computing Interference (wave propagation) Computer Science Applications Intersymbol interference Frequency domain Carrier frequency offset Guard interval Bit error rate Electrical and Electronic Engineering Algorithm Multipath propagation |
| Zdroj: | IET Communications. 8:2993-3000 |
| ISSN: | 1751-8636 |
| DOI: | 10.1049/iet-com.2014.0233 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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