Performance Analysis for OFDM-CDMA With Joint Frequency-Time Spreading

Zheng, Kan; Zeng, Guoyan; Wang, Wenbo

doi:10.1109/tbc.2004.839609

Cited by 31 publications

(28 citation statements)

References 9 publications

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“…In Figure 3, we compare the SINR PDFs for our proposed scheme defined by Equation (27) and 2D OFDM-CDMA [6]. It is clear that the probability of SINR has higher values in our proposed OFDM-CDMA system compared to 2D OFDM-CDMA system, which means that the average SINR for our proposed system will be more likely to be higher than that of the 2D OFDM-CDMA system.…”

Section: −2s H 1hmentioning

confidence: 97%

“…Figures 8 and 9 show the BER performance of OFDM-CDMA versus the average E b /N 0 for 1 and 2 receive antennas, respectively. In our simulations, we compare our proposed scheme with 2D OFDM-CDMA described in [6]. The maximum number of users allowed in Figures 8 and 9 are 16, and 32 users, respectively.…”

Section: Dahman and Shayanmentioning

confidence: 99%

“…In [6], it has been proposed a novel joint time-frequency 2-dimensional (2D) spreading method for OFDM-CDMA systems, which can offer not only time diversity, but also frequency diversity at the receiver efficiently. Each user will be allocated with one orthogonal code and spread its information data over the frequency and time domain uniformly.…”

Section: Introductionmentioning

confidence: 99%

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Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems

Dahman

Shayan

2011

EURASIP J. Adv. Signal Process.

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In this article, we propose a multiple-input-multiple-output, orthogonal frequency division multiplexing, codedivision multiple-access (MIMO OFDM-CDMA) scheme. The main objective is to provide extra flexibility in user multiplexing and data rate adaptation, that offer higher system throughput and better diversity gains. This is done by spreading on all the signal domains; i.e, space-time frequency spreading is employed to transmit users' signals. The flexibility to spread on all three domains allows us to independently spread users' data, to maintain increased system throughput and to have higher diversity gains. We derive new accurate approximations for the probability of symbol error and signal-to-interference noise ratio (SINR) for zero forcing (ZF) receiver. This study and simulation results show that MIMO OFDM-CDMA is capable of achieving diversity gains significantly larger than that of the conventional 2-D CDMA OFDM and MIMO MC CDMA schemes.

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Section: −2s H 1hmentioning

confidence: 97%

Section: Dahman and Shayanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems

Dahman

Shayan

2011

EURASIP J. Adv. Signal Process.

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“…(1) j can be approximated as a Gaussian random variable, which produces good results for a sufficiently large number of users and is obtained as [3], [4] …”

Section: B Reception Strategymentioning

confidence: 99%

A Receiver-Centric OFCDM Approach with Subcarrier Grouping

2012

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Abstract-In this letter, following a cross-layer design concept, we propose a novel subcarrier grouping technique for Orthogonal Frequency and Code Division Multiplexing (OFCDM) multiuser systems. We adopt a two dimensional (2D) spreading, so as to achieve both frequency-and time-domain channel gain. Furthermore, we enable a receiver-centric approach, where the receiver rather than a potential sender controls the admission decision of the communication establishment. We study the robustness of the proposed scheme in terms of the Bit-Error-Rate (BER) and the outage probability. The derived results indicate that the proposed scheme outperforms the classical OFCDM approach.

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“…Recently, Zheng, et.al, proposed an MC-CDMA system employing two dimensional, joint frequency and time domain spreading [10], known as MC-2D-CDMA. It was shown in [10] that by combining MC-CDMA and MC-DS-CDMA, and thus exploiting both time and frequency diversities, the new system performs better than the conventional MC-CDMA system, especially in fast fading channels.…”

Section: Introductionmentioning

confidence: 99%

Joint data detection and phase recovery for downlink MC-2D-CDMA systems

Xiao

2009

IEEE Trans. Commun.

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Abstract-The performance of a downlink synchronous MC-CDMA system with joint frequency-time domain spreading (MC-2D-CDMA) is investigated in this paper. We propose a two dimensional adaptive minimum mean square error (MMSE) receiver, which works in decision-directed mode after an initial training period. A subcarrier phase tracker, which comprises a bank of phase locked-loops (PLLs), is employed in the receiver to track the fading phase variability. Furthermore, a simplified phase tracker structure is proposed to reduce the system complexity. The performance of the data detector and the behavior of the phase tracker are analyzed theorectically in this paper and are shown to match the simulation results. Both analysis and simulation indicate that the proposed system outperforms the conventional MC-DS-CDMA systems by exploiting frequency diversity and facilitating subcarrier synchronization.Keywords -MC-2D-CDMA, adaptive receiver, two dimensional spreading, phase locked loops, frequency-selective Rayleigh fading

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Performance Analysis for OFDM-CDMA With Joint Frequency-Time Spreading

Cited by 31 publications

References 9 publications

Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems

Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems

A Receiver-Centric OFCDM Approach with Subcarrier Grouping

Joint data detection and phase recovery for downlink MC-2D-CDMA systems

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