[논문]Multiple Access and Inter-Carrier Interference in OFDM-CDMA with Random Sequences

Jang Won Mee; Nguyen Lim; Bidarkar Pooja

doi:10.1109/jcn.2005.6387753

Multiple Access and Inter-Carrier Interference in OFDM-CDMA with Random Sequences 원문보기

Journal of communications and networks, v.7 no.1, 2005년, pp.21 - 28

Jang Won Mee (Peter Kiewit Institute of Information Science, Technology & Engineering, Department of Computer and Electronics Engineering, University of Nebraska) , Nguyen Lim (Peter Kiewit Institute of Information Science, Technology & Engineering, Department of Computer and Electronics Engineering, University of Nebraska) , Bidarkar Pooja (Peter Kiewit Institute of Information Science, Technology & Engineering, Department of Computer and Electronics Engineering, University of Nebraska)

Abstract ▼ AI-Helper

In this paper, we analyze the performance of code division multiple access (CDMA) systems with orthogonal frequency division multiplexing (OFDM) that employ random spreading sequences in an additive white Gaussian noise (AWGN) channel. We obtain the probability density function (pdf) of the multiple access interference and extend the results to OFDM-CDMA systems to determine the pdf of multiple access and inter-carrier interference in terms of the number of users, the spreading length, the number of sub-carriers, and the frequency offset. We consider the synchronous downlink of cellular multi-carrier CDMA and derive a Gaussian approximation of the multiple access and inter-carrier interference. Overall the effect of frequency offset is shown to vary with the system loading. The analysis in this paper is critical for further development into fading channels and frequency selective multipath channels.

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The effect of frequency offset has been shown to vary with the ratio of the number of users to the spreading length. The analysis in this paper is critical for further development into fading channels and frequency selective multipath channels.

제안 방법

In summary, our principle contribution is the detailed analysis of the effect of frequency offset in OFDM-CDMA with random sequences in AWGN channels. The theoretical results presented in this paper are critical for further development into fading channels as well as frequency selective channels.
In this paper, we determine the pdf of the MAI in synchronous downlink CDMA systems with equal power and verify the analytical calculations with the simulation results. We employed random spreading sequences for analysis purpose that can provide an upper bound on the performance of the orthogonal downlink.
In this paper, we have analyzed the BER performance of OFDM-CDMA systems that employ random spreading sequences in an AWGN channel. The pdf of the MAI in down link CDMA was obtained and the BER calculations were verified with the simulation results.
In summary, our principle contribution is the detailed analysis of the effect of frequency offset in OFDM-CDMA with random sequences in AWGN channels. The theoretical results presented in this paper are critical for further development into fading channels as well as frequency selective channels. In Section Ⅱ, we propose the system model and then analyze the MAI and ICI in Section Ⅲ.
The pdf of the MAI in down link CDMA was obtained and the BER calculations were verified with the simulation results. We extended our result to the pdf of the MAI and ICI in a downlink OFDM-CDMA to determine the BER performance in terms of the number of users, the spreading length, the number of sub-carriers, and the frequency offset. To reduce the computational complexity involved in calculating the BER, we have derived a Gaussian approximation which can provide the approximate BER that compares well with the simulation.

참고문헌 (17)

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상세보기
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상세보기
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상세보기
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DOI : 10.1109/JCN.2005.6387753 [무료]
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