Near-Decorrelating Multistage Detector for Asynchronous DS-CDMA

Toshinori SUZUKI; Yoshio TAKEUCHI

Near-Decorrelating Multistage Detector for Asynchronous DS-CDMA

Toshinori SUZUKI, Yoshio TAKEUCHI

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In this paper, we propose an interference canceller for asynchronous DS-CDMA. The principle is based on parallel cancellation using soft decision(PCSD), however, we propose to add an operation to suppress the strength of interfering signals replica on PCSD. We show here that this operation plays a very important theoretical role in PCSD, and that the performance of our proposed scheme approaches that of a perfect decorrelating detector under certain conditions. With this theoretical background in mind, we named this scheme the "Near-Decorrelating Multistage Detector"(NDMD). To demonstrate NDMD performance, we performed two kinds of computer simulations. In the first kind of simulation, simple conditions are assumed in order to evaluate basic cancelling performance. In the other kind of simulation, essential techniques for CDMA cellular systems such as FEC, transmission power control(TPC), and base band filtering were implemented while taking into account NDMD as applied to such systems. These simulations numerically demonstrate that NDMD is very efficient in cancelling out interference and that it improves asynchronous DS-CDMA performance.

Publication: IEICE TRANSACTIONS on Communications Vol.E81-B No.3 pp.553-564

Publication Date: 1998/03/25

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Category: Communication Theory

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Toshinori SUZUKI, Yoshio TAKEUCHI, "Near-Decorrelating Multistage Detector for Asynchronous DS-CDMA" in IEICE TRANSACTIONS on Communications, vol. E81-B, no. 3, pp. 553-564, March 1998, doi: .
Abstract: In this paper, we propose an interference canceller for asynchronous DS-CDMA. The principle is based on parallel cancellation using soft decision(PCSD), however, we propose to add an operation to suppress the strength of interfering signals replica on PCSD. We show here that this operation plays a very important theoretical role in PCSD, and that the performance of our proposed scheme approaches that of a perfect decorrelating detector under certain conditions. With this theoretical background in mind, we named this scheme the "Near-Decorrelating Multistage Detector"(NDMD). To demonstrate NDMD performance, we performed two kinds of computer simulations. In the first kind of simulation, simple conditions are assumed in order to evaluate basic cancelling performance. In the other kind of simulation, essential techniques for CDMA cellular systems such as FEC, transmission power control(TPC), and base band filtering were implemented while taking into account NDMD as applied to such systems. These simulations numerically demonstrate that NDMD is very efficient in cancelling out interference and that it improves asynchronous DS-CDMA performance.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e81-b_3_553/_p

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@ARTICLE{e81-b_3_553,
author={Toshinori SUZUKI, Yoshio TAKEUCHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Near-Decorrelating Multistage Detector for Asynchronous DS-CDMA},
year={1998},
volume={E81-B},
number={3},
pages={553-564},
abstract={In this paper, we propose an interference canceller for asynchronous DS-CDMA. The principle is based on parallel cancellation using soft decision(PCSD), however, we propose to add an operation to suppress the strength of interfering signals replica on PCSD. We show here that this operation plays a very important theoretical role in PCSD, and that the performance of our proposed scheme approaches that of a perfect decorrelating detector under certain conditions. With this theoretical background in mind, we named this scheme the "Near-Decorrelating Multistage Detector"(NDMD). To demonstrate NDMD performance, we performed two kinds of computer simulations. In the first kind of simulation, simple conditions are assumed in order to evaluate basic cancelling performance. In the other kind of simulation, essential techniques for CDMA cellular systems such as FEC, transmission power control(TPC), and base band filtering were implemented while taking into account NDMD as applied to such systems. These simulations numerically demonstrate that NDMD is very efficient in cancelling out interference and that it improves asynchronous DS-CDMA performance.},
keywords={},
doi={},
ISSN={},
month={March},}

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TY - JOUR
TI - Near-Decorrelating Multistage Detector for Asynchronous DS-CDMA
T2 - IEICE TRANSACTIONS on Communications
SP - 553
EP - 564
AU - Toshinori SUZUKI
AU - Yoshio TAKEUCHI
PY - 1998
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E81-B
IS - 3
JA - IEICE TRANSACTIONS on Communications
Y1 - March 1998
AB - In this paper, we propose an interference canceller for asynchronous DS-CDMA. The principle is based on parallel cancellation using soft decision(PCSD), however, we propose to add an operation to suppress the strength of interfering signals replica on PCSD. We show here that this operation plays a very important theoretical role in PCSD, and that the performance of our proposed scheme approaches that of a perfect decorrelating detector under certain conditions. With this theoretical background in mind, we named this scheme the "Near-Decorrelating Multistage Detector"(NDMD). To demonstrate NDMD performance, we performed two kinds of computer simulations. In the first kind of simulation, simple conditions are assumed in order to evaluate basic cancelling performance. In the other kind of simulation, essential techniques for CDMA cellular systems such as FEC, transmission power control(TPC), and base band filtering were implemented while taking into account NDMD as applied to such systems. These simulations numerically demonstrate that NDMD is very efficient in cancelling out interference and that it improves asynchronous DS-CDMA performance.
ER -