Macroscopic Diversity Combining Technique for Forward-Link of CDMA Cellular Systems

Yuh-Ren TSAI

doi:10.1093/ietcom/e90-b.1.69

Macroscopic Diversity Combining Technique for Forward-Link of CDMA Cellular Systems

Yuh-Ren TSAI

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In CDMA cellular systems, the frequency reuse factor equals one. Therefore, the soft-handoff technology with combining macroscopic diversity was introduced to enhance the link performance. In this work, a novel macroscopic diversity combining scheme is proposed to enhance the link performance of the forward-link. The basic concept of this scheme is to integrate error correction coding into the soft-handoff technology. According to the number of soft-handoff channels, the source information is encoded by a convolutional code with a lower code rate. The coded symbols are then equally distributed to all channels from different BSs to the MS, and each channel carries a disjointed set of coded symbols. For this proposed scheme, no extra transmission power or bandwidth is required. The only cost is a slight increase of the encoding and decoding complexity of the convolutional codes. Numerical and simulation results show that a performance gain of 1 dB in bit energy-to-total noise power density ratio can be obtained as compared with the conventional scheme in the same conditions.

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.1 pp.69-77

Publication Date: 2007/01/01

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Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.1.69

Type of Manuscript: PAPER

Category: Terrestrial Radio Communications

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Yuh-Ren TSAI, "Macroscopic Diversity Combining Technique for Forward-Link of CDMA Cellular Systems" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 1, pp. 69-77, January 2007, doi: 10.1093/ietcom/e90-b.1.69.
Abstract: In CDMA cellular systems, the frequency reuse factor equals one. Therefore, the soft-handoff technology with combining macroscopic diversity was introduced to enhance the link performance. In this work, a novel macroscopic diversity combining scheme is proposed to enhance the link performance of the forward-link. The basic concept of this scheme is to integrate error correction coding into the soft-handoff technology. According to the number of soft-handoff channels, the source information is encoded by a convolutional code with a lower code rate. The coded symbols are then equally distributed to all channels from different BSs to the MS, and each channel carries a disjointed set of coded symbols. For this proposed scheme, no extra transmission power or bandwidth is required. The only cost is a slight increase of the encoding and decoding complexity of the convolutional codes. Numerical and simulation results show that a performance gain of 1 dB in bit energy-to-total noise power density ratio can be obtained as compared with the conventional scheme in the same conditions.
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.1.69/_p

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@ARTICLE{e90-b_1_69,
author={Yuh-Ren TSAI, },
journal={IEICE TRANSACTIONS on Communications},
title={Macroscopic Diversity Combining Technique for Forward-Link of CDMA Cellular Systems},
year={2007},
volume={E90-B},
number={1},
pages={69-77},
abstract={In CDMA cellular systems, the frequency reuse factor equals one. Therefore, the soft-handoff technology with combining macroscopic diversity was introduced to enhance the link performance. In this work, a novel macroscopic diversity combining scheme is proposed to enhance the link performance of the forward-link. The basic concept of this scheme is to integrate error correction coding into the soft-handoff technology. According to the number of soft-handoff channels, the source information is encoded by a convolutional code with a lower code rate. The coded symbols are then equally distributed to all channels from different BSs to the MS, and each channel carries a disjointed set of coded symbols. For this proposed scheme, no extra transmission power or bandwidth is required. The only cost is a slight increase of the encoding and decoding complexity of the convolutional codes. Numerical and simulation results show that a performance gain of 1 dB in bit energy-to-total noise power density ratio can be obtained as compared with the conventional scheme in the same conditions.},
keywords={},
doi={10.1093/ietcom/e90-b.1.69},
ISSN={1745-1345},
month={January},}

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TY - JOUR
TI - Macroscopic Diversity Combining Technique for Forward-Link of CDMA Cellular Systems
T2 - IEICE TRANSACTIONS on Communications
SP - 69
EP - 77
AU - Yuh-Ren TSAI
PY - 2007
DO - 10.1093/ietcom/e90-b.1.69
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2007
AB - In CDMA cellular systems, the frequency reuse factor equals one. Therefore, the soft-handoff technology with combining macroscopic diversity was introduced to enhance the link performance. In this work, a novel macroscopic diversity combining scheme is proposed to enhance the link performance of the forward-link. The basic concept of this scheme is to integrate error correction coding into the soft-handoff technology. According to the number of soft-handoff channels, the source information is encoded by a convolutional code with a lower code rate. The coded symbols are then equally distributed to all channels from different BSs to the MS, and each channel carries a disjointed set of coded symbols. For this proposed scheme, no extra transmission power or bandwidth is required. The only cost is a slight increase of the encoding and decoding complexity of the convolutional codes. Numerical and simulation results show that a performance gain of 1 dB in bit energy-to-total noise power density ratio can be obtained as compared with the conventional scheme in the same conditions.
ER -