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

Yan, Yanxin

doi:10.1109/lcomm.2015.2391103

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…The oversampling has other advantages as well, such as enhancing the performance of linear equalizers [32], [37], [38], decreasing OFDM edge effects [39], [40], increasing the time resolution in DFT-based schemes [41], easing the DAC design [33], achieving blind carrier-frequency-offset recovery [42], detection and channel estimation [43], [44], and clipping noise suppression [45].…”

Section: B Our Contributionmentioning

confidence: 99%

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OFDM Signal Recovery in Deep Faded Erasure Channel

et al. 2019

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In high-speed digital wireless communication applications, the intersymbol interference channel may have spectral nulls or erasures, which may degrade the orthogonal frequency division multiplexing (OFDM) bit error rate (BER) performance. In this paper, we prove that the BER performance of the OFDM system is considerably refined if the erased symbols in erasure channel (or received symbols on the deepfaded subcarriers in Rayleigh fading channel) are estimated based on the rest symbols in each OFDM signal. Also, an oversampled OFDM scheme which is a particular form of the pre-coded OFDM schemes is considered to guarantee high enough sampling rate. Furthermore, a new iterative receiver is proposed for perfect symbol recovery. A comprehensive Monte Carlo simulation study is performed to validate the theoretical results and affirm the superior performance of the oversampled OFDM scheme with the iterative receiver, compared with the typical detector for the OFDM scheme. INDEX TERMS Orthogonal frequency division multiplexing (OFDM), intersymbol interference (ISI), erasure channel.

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Section: B Our Contributionmentioning

confidence: 99%

“…Note that for simplicity we considered and G t instead of and G t in equation (42) (i.e., E = I N ). Thus, from (28) and (43) we have:…”

Section: Appendix a Proof Of The Equation (5)mentioning

confidence: 99%

OFDM Signal Recovery in Deep Faded Erasure Channel

et al. 2019

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“…9,10 The equal gain combining receiver has capability of correcting channel-induced phase distortions but files to correct faded magnitudes of received signals. 12 To balance the trade-off between the performance and complexity, suboptimal techniques like frequency-domain oversampling receiver, 13 SAGE receivers, 14 and iterative block-decision feedback (IB-DFE)-based receivers 15,16 are proposed for MC-CDMA system. Though the minimum mean square error (MMSE) receiver detects transmitted signal by considering noise variance and channel covariance, it cannot mitigate nonlinearistic distortion in the channel; as a result, it also gives high residual interference.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, its implementation in real-time systems is restricted. 12 To balance the trade-off between the performance and complexity, suboptimal techniques like frequency-domain oversampling receiver, 13 SAGE receivers, 14 and iterative block-decision feedback (IB-DFE)-based receivers 15,16 are proposed for MC-CDMA system. Among various suboptimal receivers, the IB-DFE receiver is achieving performance close to optimal receivers as it cancels the residual interference through the feedback signals.…”

Section: Introductionmentioning

confidence: 99%

MC–CDMA receiver design using recurrent neural networks for eliminating multiple access interference and nonlinear distortion

Kumar

Bagadi

2017

Int J Communication

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Multicarrier code division multiple access (MC-CDMA) is a promising wireless communication technology with high spectral efficiency and system performance. However, all multiple access techniques including MC-CDMA were most likely to have multiple access interference (MAI). So this paper mainly aims at designing a suitable receiver for MC-CDMA system to mitigate such MAI. The classical receivers like maximal ratio combining, minimum mean square error, and iterative block-decision feedback equalization fail to cancel MAI when the MC-CDMA is subjected to severe nonlinear distortions, which may occur due to saturated power amplifiers or arbitrary channel conditions. Being highly nonlinear structures, the neural network receivers such as multilayer perceptron and recurrent neural network could be better alternative for such a case. The feasibility, efficiency, and effectiveness of the proposed neural network receiver are studied thoroughly for MC-CDMA system under different nonlinear conditions.

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“…Hence, interest has shifted towards suboptimal receiver designs considering the performance and complexity trade-off. This has resulted in the use of space-alternating generalized expectation maximization (SAGE) receiver [21] and frequency domain receiver [22] in MC-CDMA systems. Among the various suboptimal receivers, the block decision feedback equalizer (IB-DFE) receiver is proposed for single carrier transmission.…”

mentioning

confidence: 99%

Detection of Signals in MC–CDMA Using a Novel Iterative Block Decision Feedback Equalizer

Bagadi

Sathish

et al. 2022

IEEE Access

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This paper presents a technique to mitigate multiple access interference (MAI) in multicarrier code division multiple access (MC-CDMA) wireless communications systems. Although under normal circumstances the MC-CDMA system can achieve high spectral efficiency and resistance towards inter symbol interference (ISI) however when exposed to substantial nonlinear distortion the issue of MAI manifests. Such distortion results when the power amplifiers are driven into saturation or when the transmit signal experiences extreme adverse channel conditions. The proposed technique uses a modified iterative block decision feedback equalizer (IB-DFE) that uses a minimal mean square error (MMSE) receiver in the feed-forward path to nullify the residual interference from the IB-DFE receiver. The received signal is refiltered in an iterative process to significantly improve the MC-CDMA system's performance. The effectiveness of the proposed modified IB-DFE technique in MC-CDMA systems has been analysed under various harsh nonlinear conditions, and the results of this analysis presented here confirm the effectiveness of the proposed technique to outperform conventional methodologies in terms of the bit error rate (BER) and lesser computational complexity.

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

Cited by 12 publications

References 11 publications

OFDM Signal Recovery in Deep Faded Erasure Channel

OFDM Signal Recovery in Deep Faded Erasure Channel

MC–CDMA receiver design using recurrent neural networks for eliminating multiple access interference and nonlinear distortion

Detection of Signals in MC–CDMA Using a Novel Iterative Block Decision Feedback Equalizer

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