Delayed Symbol Combining Interference Canceller for Multi Rate DS-CDMA in Mobile Radio Environment

Eisuke KUDOH; Shigeaki OGOSE

Delayed Symbol Combining Interference Canceller for Multi Rate DS-CDMA in Mobile Radio Environment

Eisuke KUDOH, Shigeaki OGOSE

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Direct sequence code division multiple access (DS-CDMA) is attractive for mobile radio use because of its inherently high capacity. There is great demand for mobile radio to offer multimedia services. This means that various service rates and qualities should be supported. DS-CDMA systems are flexible and can accommodate various user rates easily so these demands can be met. As many users will occupy the same frequency band simultaneously, the traffic capacity of a DS-CDMA system is determined by interference power. Interference cancellation is one of the important techniques in decreasing interference power at the demodulation stage and thus increasing traffic capacity. In this paper, we propose the delayed symbol combining interference canceller which can suppress the interference from various users sending at different information rates. Performance of the proposed method is calculated by computer simulations. Furthermore, the effect of adding forward error correction to the proposed canceller is also evaluated by computer simulations. In the quasi static flat fading environment, it is found that the Eb/No degradation due to interference is suppressed to 3 dB at BER=10^-3 with 24 users. In the quasi static frequency selective fading environment, it is found that the required Eb/No of the frequency selective fading canceller is about 11 dB better than that of the flat fading canceller for the target BER of 10^-3. It is found that BER<10^-3 is achieved with forward error correction and bit interleaving even when the maximum Doppler frequency normalized by low data bit rate is 0. 0008 and Eb/No is 20 [dB] in frequency selective fading and 30 [dB] in flat fading.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E81-A No.7 pp.1430-1435

Publication Date: 1998/07/25

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Type of Manuscript: Special Section PAPER (Special Section on Fundamentals of Multi-dimensional Mobile Information Network)

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Eisuke KUDOH, Shigeaki OGOSE, "Delayed Symbol Combining Interference Canceller for Multi Rate DS-CDMA in Mobile Radio Environment" in IEICE TRANSACTIONS on Fundamentals, vol. E81-A, no. 7, pp. 1430-1435, July 1998, doi: .
Abstract: Direct sequence code division multiple access (DS-CDMA) is attractive for mobile radio use because of its inherently high capacity. There is great demand for mobile radio to offer multimedia services. This means that various service rates and qualities should be supported. DS-CDMA systems are flexible and can accommodate various user rates easily so these demands can be met. As many users will occupy the same frequency band simultaneously, the traffic capacity of a DS-CDMA system is determined by interference power. Interference cancellation is one of the important techniques in decreasing interference power at the demodulation stage and thus increasing traffic capacity. In this paper, we propose the delayed symbol combining interference canceller which can suppress the interference from various users sending at different information rates. Performance of the proposed method is calculated by computer simulations. Furthermore, the effect of adding forward error correction to the proposed canceller is also evaluated by computer simulations. In the quasi static flat fading environment, it is found that the Eb/No degradation due to interference is suppressed to 3 dB at BER=10^-3 with 24 users. In the quasi static frequency selective fading environment, it is found that the required Eb/No of the frequency selective fading canceller is about 11 dB better than that of the flat fading canceller for the target BER of 10^-3. It is found that BER<10^-3 is achieved with forward error correction and bit interleaving even when the maximum Doppler frequency normalized by low data bit rate is 0. 0008 and Eb/No is 20 [dB] in frequency selective fading and 30 [dB] in flat fading.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e81-a_7_1430/_p

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@ARTICLE{e81-a_7_1430,
author={Eisuke KUDOH, Shigeaki OGOSE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Delayed Symbol Combining Interference Canceller for Multi Rate DS-CDMA in Mobile Radio Environment},
year={1998},
volume={E81-A},
number={7},
pages={1430-1435},
abstract={Direct sequence code division multiple access (DS-CDMA) is attractive for mobile radio use because of its inherently high capacity. There is great demand for mobile radio to offer multimedia services. This means that various service rates and qualities should be supported. DS-CDMA systems are flexible and can accommodate various user rates easily so these demands can be met. As many users will occupy the same frequency band simultaneously, the traffic capacity of a DS-CDMA system is determined by interference power. Interference cancellation is one of the important techniques in decreasing interference power at the demodulation stage and thus increasing traffic capacity. In this paper, we propose the delayed symbol combining interference canceller which can suppress the interference from various users sending at different information rates. Performance of the proposed method is calculated by computer simulations. Furthermore, the effect of adding forward error correction to the proposed canceller is also evaluated by computer simulations. In the quasi static flat fading environment, it is found that the Eb/No degradation due to interference is suppressed to 3 dB at BER=10^-3 with 24 users. In the quasi static frequency selective fading environment, it is found that the required Eb/No of the frequency selective fading canceller is about 11 dB better than that of the flat fading canceller for the target BER of 10^-3. It is found that BER<10^-3 is achieved with forward error correction and bit interleaving even when the maximum Doppler frequency normalized by low data bit rate is 0. 0008 and Eb/No is 20 [dB] in frequency selective fading and 30 [dB] in flat fading.},
keywords={},
doi={},
ISSN={},
month={July},}

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TY - JOUR
TI - Delayed Symbol Combining Interference Canceller for Multi Rate DS-CDMA in Mobile Radio Environment
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1430
EP - 1435
AU - Eisuke KUDOH
AU - Shigeaki OGOSE
PY - 1998
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E81-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 1998
AB - Direct sequence code division multiple access (DS-CDMA) is attractive for mobile radio use because of its inherently high capacity. There is great demand for mobile radio to offer multimedia services. This means that various service rates and qualities should be supported. DS-CDMA systems are flexible and can accommodate various user rates easily so these demands can be met. As many users will occupy the same frequency band simultaneously, the traffic capacity of a DS-CDMA system is determined by interference power. Interference cancellation is one of the important techniques in decreasing interference power at the demodulation stage and thus increasing traffic capacity. In this paper, we propose the delayed symbol combining interference canceller which can suppress the interference from various users sending at different information rates. Performance of the proposed method is calculated by computer simulations. Furthermore, the effect of adding forward error correction to the proposed canceller is also evaluated by computer simulations. In the quasi static flat fading environment, it is found that the Eb/No degradation due to interference is suppressed to 3 dB at BER=10^-3 with 24 users. In the quasi static frequency selective fading environment, it is found that the required Eb/No of the frequency selective fading canceller is about 11 dB better than that of the flat fading canceller for the target BER of 10^-3. It is found that BER<10^-3 is achieved with forward error correction and bit interleaving even when the maximum Doppler frequency normalized by low data bit rate is 0. 0008 and Eb/No is 20 [dB] in frequency selective fading and 30 [dB] in flat fading.
ER -