Downlink site diversity with frequency-domain equalization for a DS-CDMA cellular system

Hirotaka Sato; Hiromichi Tomeba; Kazuaki Takeda; Fumiyuki Adachi

doi:10.1109/ICCS.2006.301489

Downlink site diversity with frequency-domain equalization for a DS-CDMA cellular system

Hirotaka Sato, Hiromichi Tomeba, Kazuaki Takeda, Fumiyuki Adachi

Research Organization of Electrical Communication (ROEC)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In DS-CDMA high speed wireless signal transmissions, the bit error rate (BER) performance with coherent rake combining degrades due to inter-path interference (IPI) caused by a severe frequency-selective fading. The use of frequency-domain equalization (FDE) can significantly improve the BER performance. However, the local average received signal power slowly varies due to path loss and shadowing loss according to the movement of a mobile user. This variation degrades the link capacity particularly when the user is located close to the cell edge. To improve the link capacity, the well-known site diversity can be used in conjunction with FDE. In this paper, we present downlink site diversity with FDE for a DS-CDMA cellular system and derive the MMSE weight for site diversity combining. The downlink capacity is evaluated by computer simulation and compared to the case with coherent rake combining. Then it is shown that the link capacity with FDE is better than that with coherent rake combining.

Original language	English
Title of host publication	2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006
DOIs	https://doi.org/10.1109/ICCS.2006.301489
Publication status	Published - 2006
Event	10th IEEE Singapore International Conference on Communications Systems, ICCS 2006 - Singapore, Singapore Duration: 2006 Oct 30 → 2006 Nov 1

Publication series

Name	2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006

Other

Other	10th IEEE Singapore International Conference on Communications Systems, ICCS 2006
Country	Singapore
City	Singapore
Period	06/10/30 → 06/11/1

ASJC Scopus subject areas

Computer Networks and Communications
Communication
Electrical and Electronic Engineering

Access to Document

10.1109/ICCS.2006.301489

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Downlink site diversity with frequency-domain equalization for a DS-CDMA cellular system. / Sato, Hirotaka; Tomeba, Hiromichi; Takeda, Kazuaki; Adachi, Fumiyuki.

2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006. 2006. 4085784 (2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Sato, H, Tomeba, H, Takeda, K & Adachi, F 2006, Downlink site diversity with frequency-domain equalization for a DS-CDMA cellular system. in 2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006., 4085784, 2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006, 10th IEEE Singapore International Conference on Communications Systems, ICCS 2006, Singapore, Singapore, 06/10/30. https://doi.org/10.1109/ICCS.2006.301489

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abstract = "In DS-CDMA high speed wireless signal transmissions, the bit error rate (BER) performance with coherent rake combining degrades due to inter-path interference (IPI) caused by a severe frequency-selective fading. The use of frequency-domain equalization (FDE) can significantly improve the BER performance. However, the local average received signal power slowly varies due to path loss and shadowing loss according to the movement of a mobile user. This variation degrades the link capacity particularly when the user is located close to the cell edge. To improve the link capacity, the well-known site diversity can be used in conjunction with FDE. In this paper, we present downlink site diversity with FDE for a DS-CDMA cellular system and derive the MMSE weight for site diversity combining. The downlink capacity is evaluated by computer simulation and compared to the case with coherent rake combining. Then it is shown that the link capacity with FDE is better than that with coherent rake combining.",

author = "Hirotaka Sato and Hiromichi Tomeba and Kazuaki Takeda and Fumiyuki Adachi",

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