Performance Comparison between Time-Multiplexed Pilot Channel and Parallel Pilot Channel for Coherent Rake Combining in DS-CDMA Mobile Radio

Sadayuki ABETA  Mamoru SAWAHASHI  Fumiyuki ADACHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E81-B   No.7   pp.1417-1425
Publication Date: 1998/07/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Third Generation Land Mobile Communication Systems)
Category: 
Keyword: 
DS-CDMA,  channel estimation,  pilot channel,  transmitter power control,  

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Summary: 
This paper compares the BER performance of two types of pilot channel-based coherent Rake combining achievable by the use of weighted multi-slot averaging (WMSA) channel estimation filter in DS-CDMA transmission links. One is for the time-multiplexed pilot channel and the other is for the parallel pilot channel. The WMSA channel estimation filter weights and averages the received pilot over a period of several slots to improve the BER performance. We propose the WMSA channel estimation filters for time-multiplexed pilot and parallel pilot structures. Achievable BER performance under frequency-selective fading environments is computer simulated. The simulation results show that almost same BER performance can be achieved for both pilot channel structures when the same energy is allocated to the pilot.