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Optimized Cell ID Codes for SSDT Power Control in W-CDMA System  

Young-Joon Song (Dept. of Electronic Engineering, Kumoh Nat'l Institute of Tech.)
Bong-Hoe Kim (UMTS System Research Lab., LG Electronics Inc.)
Hae Chung (Dept. of Electronic Engineering, Kumoh Nat'l Institute of Tech.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.13, no.8, 2002 , pp. 804-810 More about this Journal
Abstract
The code division multiple access(CDMA) system capacity is limited by the amount of interference of the system. To reduce the unnecessary interference, this paper proposes optimized cell identification codes for site selection diversity transmission(SSDT) power control in wideband code division multiple access system of third generation partnership project(3GPP). The main objective of SSDT power control is to transmit on the downlink from the primary cell, and thus reducing the interference caused by the multiple transmission. In order to select a primary cell, each cell is assigned a temporary identification(ID) and user equipment(UE) periodically informs a primary cell ID to the connecting cells during soft handover. The non-primary cells selected by UE do not transmit the dedicated physical data channel(DPDCH) to reduce the interference. A major issue with the SSDT technology is the impact of uplink symbol errors on its performance. These errors can corrupt the primary ID code and this may lead to wrong decoding in the base station receivers. The proposed SSDT cell ID codes are designed to minimize the problem and to be easily decoded using simple fast Hadamard transformation(FHT) decoder.
Keywords
CDMA; SSDT; Cell ID; Power Control; Interference; FHT;
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