A frequency-domain oversampling detector for zero-padded MC-CDMA systems

Yan, Yanxin; Gong, Yi; Guan, Yong Liang

doi:10.1109/icics.2009.5397605

Cited by 5 publications

(11 citation statements)

References 11 publications

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“…2 shows the BER performance of the conventional ZF, the MMSE and the proposed FDO-MMSE receivers. It can be found that the FDO based MMSE receiver for CP MC-CDMA has much better BER performance than those of the conventional ZF and MMSE equalizers at all the SNR levels, and is even slightly better than the FDO-MMSE for ZP MC-CDMA (derived from the algorithms in [11] and [12]). If the guard interval increases from N /8 to N /4, the BER of the proposed FDO based MMSE equalizer can be further reduced.…”

Section: Simulation Results and Discussionmentioning

confidence: 92%

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Novel Frequency-Domain Oversampling Receiver for CP MC-CDMA Systems

Yan

2015

IEEE Commun. Lett.

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The multi-carrier code division multiple access (MC-CDMA) technique is a promising technology because it incorporates the benefits of the orthogonal frequency division multiplexing (OFDM) and the direct sequence code division multiple access (DS-CDMA) techniques. The bit error rate (BER) of the MC-CDMA system reduces more quickly than that of the OFDM system when increasing the transmission power. In this paper, we propose a novel frequency-domain oversampling (FDO) minimum mean square error (MMSE) receiver for the cyclic prefix (CP) MC-CDMA. Simulation results show that the proposed FDO based receiver for the CP MC-CDMA systems can outperform the traditional zero forcing (ZF) and MMSE equalizers in terms of BER performance for all the spreading factors (SF).Index Terms-Multi-carrier CDMA, frequency domain oversampling, MMSE detection.

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Section: Simulation Results and Discussionmentioning

confidence: 92%

“…The authors in [12] have proposed a FDO based MMSE equalizer for ZP MC-CDMA systems. Although these FDO based MMSE equalizers have better BER performance than the conventional equalizer, they are only suitable for the ZP based multi-carrier modulation (MCM) systems such as the ZP OFDM and the ZP MC-CDMA systems.…”

Section: Introductionmentioning

confidence: 99%

Novel Frequency-Domain Oversampling Receiver for CP MC-CDMA Systems

Yan

2015

IEEE Commun. Lett.

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“…The FDFS-MMSE design for ZP OFDM has been proposed in [4,5,15,16], where the fast Fourier transform (FFT) size M is set to N + J. When the channel delay is longer than the guard interval (i.e.…”

Section: Proposed Iterative Frequency-domain Fractionally Spaced (Fdfmentioning

confidence: 99%

“…L ≤ J ), there is no ISI between two OFDM symbols. Thus the step (2) is not necessary, and the proposed FDFS-based receivers can be simplified to the conventional FDFS receivers in [4,5,15,16].…”

Section: N=0mentioning

confidence: 99%

“…In [14], a FDO-based receiver has been proposed to suppress the MAI induced by the Doppler shifts and the frequency offset for the uplink of MC-CDMA systems, where it oversamples the received signal with an integer oversampling factor, and then groups all the samples to simplify the Wiener-Hopf linear MMSE equaliser. The works in [5,15,16] have introduced a FDFS-MMSE equalisation for ZP OFDM by using the complete OFDM symbols including the guard interval, which actually can be regarded as a special FDO approach with a fixed oversampling factor (OSF). In [17,18], the authors have adopted the FDO approach for the ZP OFDM in the underwater acoustic communications.…”

Section: Introductionmentioning

confidence: 99%

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

2014

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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 FDFSbased 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.

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