Performance Analyses of OFDM–CDMA Receivers in Multipath Fading Channels

Chen, Jun-Da; Ueng, Fang‐Biau; Chang, Jui-Chi; Su, Hsien

doi:10.1109/tvt.2009.2026479

Cited by 19 publications

(2 citation statements)

References 13 publications

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“…The sequence of each data block has to be interleaved such that G consecutive chips in (1) (corresponds to a single PSK symbol) can be approximately transmitted over G-independent fading subchannels. As the simple frequency interleaving and deinterleaving methods are applied in the proposed system, the similar symbol error rate (SER) for the detection of PSKmodulated symbol in [31] can be achieved. After carrying out interleaving process, the sequence of a data block becomes…”

Section: System Descriptionmentioning

confidence: 99%

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Adaptive constrained CM-based multicarrier-CDMA receivers in multipath fading channels

Chen

Shen

2013

J Wireless Com Network

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Two blind adaptive receivers, based on constrained constant modulus (CM) algorithms, are investigated for the detection of the multicarrier code division multiple access (MC-CDMA) system in the multiuser and multipath channels. As the data rate of the information bit is getting high enough, the transmitted signal of the MC-CDMA system becomes more sensitive to the frequency-selective fading. To mitigate this drawback, the parallel transmissions of multiple data symbols within one OFDM block are employed in the proposed systems to ensure that the length of the cyclic prefix (CP) is longer than the delay spread of the multipath channel. The first receiver is called a full-tap receiver (TDes receiver), which can carry out the interference suppression in the frequency-domain. Alternatively, a reduced-tap receiver (TRTap) is proposed on the basis of the derived cyclically shifting matrix. According to the derived matrix representation of the received signal, the analytical steady-state mean square errors (MSEs) for both receivers are also derived and compared. Simulation results are provided to illustrate the effectiveness of the proposed receivers and validate the accuracy of the theoretical analysis. As expected, the symbol error rate (SER) performance of the full-tap receiver is better than that of the reduced-tap receiver in severe interference environments. In contrast, the reduced-tap receiver can provide the satisfied SER performance just like the full-tap receiver in low-interference scenarios, even though the former one adopts only one-tap equalization.

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Section: System Descriptionmentioning

confidence: 99%

“…According to (31) and (33), the steady-state MSE of TDes is equal to that of TRTap with z = N c /ς in the single-user environment. From (32), (33), and (47), we have…”

Section: Single-user Scenario Under Multipath Fading Channelmentioning

confidence: 99%

Adaptive constrained CM-based multicarrier-CDMA receivers in multipath fading channels

Chen

Shen

2013

J Wireless Com Network

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Performances of OFDM‐CDMA receivers with MIMO communications

Chang

Ueng

Wang

et al. 2012

Int J Communication

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SUMMARYThis paper considers the joint design of OFDM and code division multiple access (CDMA) with MIMO communications. The receivers for both Bell Labs Layered Space Time system and space–time block code are designed in this paper. The performances of the MIMO‐OFDM‐CDMA receivers are investigated in several typical fading channels. The maximum likelihood, zero forcing, and minimum mean square error receivers for the MIMO‐OFDM‐CDMA systems are derived, and the performances in the typical fading channels are verified by the simulations. Copyright © 2012 John Wiley & Sons, Ltd.

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Performance analyses of adaptive noncoherent receivers for MC‐CDMA communications

Chen

Ueng

Shen

et al. 2014

Int J Communication

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SUMMARYIn this paper, we propose differential phase-shift keying (DPSK) noncoherent receivers for multicarrier code division multiple access systems in multipath channels. The noncoherent receivers are composed of a linear equalizer and a decision-feedback differential detector to detect DPSK signals. The performances of the proposed noncoherent receivers can be improved by increasing the number of feedback symbols. For an infinite number of feedback symbols, the optimum weight can be derived analytically, and the performances of the proposed noncoherent receivers approach that of the conventional coherent receiver. For adaptation of the equalizer coefficients, modified least mean square and recursive least squares algorithms are proposed. Furthermore, the reduced-rank schemes are proposed to simplify the system complexities. Some simulation examples are given to show the system performances of the four proposed receivers.

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Performance Analyses of OFDM–CDMA Receivers in Multipath Fading Channels

Cited by 19 publications

References 13 publications

Adaptive constrained CM-based multicarrier-CDMA receivers in multipath fading channels

Adaptive constrained CM-based multicarrier-CDMA receivers in multipath fading channels

Performances of OFDM‐CDMA receivers with MIMO communications

Performance analyses of adaptive noncoherent receivers for MC‐CDMA communications

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