Performance of Asynchronous Long-Code Multicarrier CDMA Systems in the Presence of Frequency Offsets and Correlated Fading

Feng-Tsun Chien; Chien H. Hwang; C. C. Jay Kuo

doi:10.1109/GLOCOM.2003.1258404

Performance of Asynchronous Long-Code Multicarrier CDMA Systems in the Presence of Frequency Offsets and Correlated Fading

Feng-Tsun Chien, Chien H. Hwang, C. C. Jay Kuo

Institute of Electronics

Research output: Contribution to conference › Paper › peer-review

1 Scopus citations

Abstract

The effects of frequency offsets and aperiodic random spreading sequences on the performance of asynchronous multicarrier code division multiple access (CDMA) systems with correlated fading are investigated in this research. Random parameters including asynchronous delays, correlated Rayleigh fading and spreading sequences are averaged to determine the covariance matrix of the interferenceplus-noise vector. An analytic expression for the average signal-to-interference-plus-noise ratio (SINR) is obtained. Furthermore, average bit error probability (BEP) based on the Gaussian approximation is also derived. We show that the system degrades significantly if the frequency offset of the desired user is present, while the system is insensitive to interferers' frequency offsets. In consequence, it is crucial to estimate and compensate the desired user's synchronization imperfection. Finally, design tradeoff among the number of sub-carriers, fading correlations, and inter-carrier interference (ICI) are presented in simulation results.

Original language	English
Pages	1079-1083
Number of pages	5
DOIs	https://doi.org/10.1109/GLOCOM.2003.1258404
State	Published - Dec 2003
Event	IEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States Duration: 1 Dec 2003 → 5 Dec 2003

Conference

Conference	IEEE Global Telecommunications Conference GLOBECOM'03
Country/Territory	United States
City	San Francisco, CA
Period	1/12/03 → 5/12/03

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10.1109/GLOCOM.2003.1258404

Cite this

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title = "Performance of Asynchronous Long-Code Multicarrier CDMA Systems in the Presence of Frequency Offsets and Correlated Fading",

abstract = "The effects of frequency offsets and aperiodic random spreading sequences on the performance of asynchronous multicarrier code division multiple access (CDMA) systems with correlated fading are investigated in this research. Random parameters including asynchronous delays, correlated Rayleigh fading and spreading sequences are averaged to determine the covariance matrix of the interferenceplus-noise vector. An analytic expression for the average signal-to-interference-plus-noise ratio (SINR) is obtained. Furthermore, average bit error probability (BEP) based on the Gaussian approximation is also derived. We show that the system degrades significantly if the frequency offset of the desired user is present, while the system is insensitive to interferers' frequency offsets. In consequence, it is crucial to estimate and compensate the desired user's synchronization imperfection. Finally, design tradeoff among the number of sub-carriers, fading correlations, and inter-carrier interference (ICI) are presented in simulation results.",

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PY - 2003/12

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N2 - The effects of frequency offsets and aperiodic random spreading sequences on the performance of asynchronous multicarrier code division multiple access (CDMA) systems with correlated fading are investigated in this research. Random parameters including asynchronous delays, correlated Rayleigh fading and spreading sequences are averaged to determine the covariance matrix of the interferenceplus-noise vector. An analytic expression for the average signal-to-interference-plus-noise ratio (SINR) is obtained. Furthermore, average bit error probability (BEP) based on the Gaussian approximation is also derived. We show that the system degrades significantly if the frequency offset of the desired user is present, while the system is insensitive to interferers' frequency offsets. In consequence, it is crucial to estimate and compensate the desired user's synchronization imperfection. Finally, design tradeoff among the number of sub-carriers, fading correlations, and inter-carrier interference (ICI) are presented in simulation results.

AB - The effects of frequency offsets and aperiodic random spreading sequences on the performance of asynchronous multicarrier code division multiple access (CDMA) systems with correlated fading are investigated in this research. Random parameters including asynchronous delays, correlated Rayleigh fading and spreading sequences are averaged to determine the covariance matrix of the interferenceplus-noise vector. An analytic expression for the average signal-to-interference-plus-noise ratio (SINR) is obtained. Furthermore, average bit error probability (BEP) based on the Gaussian approximation is also derived. We show that the system degrades significantly if the frequency offset of the desired user is present, while the system is insensitive to interferers' frequency offsets. In consequence, it is crucial to estimate and compensate the desired user's synchronization imperfection. Finally, design tradeoff among the number of sub-carriers, fading correlations, and inter-carrier interference (ICI) are presented in simulation results.

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Performance of Asynchronous Long-Code Multicarrier CDMA Systems in the Presence of Frequency Offsets and Correlated Fading

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