Analysis of performance degradation with generalized orthogonal codes due to channel estimation errors in pre-rake TDD/DS-CDMA downlink

Authors:
C. Subhas;K. Rama Naidu;Y. Venkatarami Reddy
Affiliations:
Department of E C E, Sree Vidyanikethan Engineering College, Tirupati A. P., India;Department of E C E, JNTU College of Engineering, Anantapur, A. P., India;Public Service Commission, Nampally, Hyderabad, A. P., India
Venue:
COMSNETS'10 Proceedings of the 2nd international conference on COMmunication systems and NETworks
Year:
2010

Citing 4
Cited 0

The Performance of TDD/CDMA Systems Using Pre-Rake Combining with Different Diversity Techniques and Imperfect Channel Estimation

ISCC '97 Proceedings of the 2nd IEEE Symposium on Computers and Communications (ISCC '97)
Spreading sequence design and theoretical limits for quasisynchronous CDMA systems

EURASIP Journal on Wireless Communications and Networking - Special issue on innovative signal transmission and detection techniques for next generation cellular CDMA systems
A moment-based blind method for identification of FIR down-linkDS-CDMA channels

IEEE Transactions on Signal Processing
Performance comparisons of channel estimation techniques in multipath fading CDMA

IEEE Transactions on Wireless Communications

Quantified Score

Hi-index	0.00

Visualization

Abstract

The Pre-Rake diversity combining technique decreases the complexity, size and cost of the mobile unit while achieving the same inter symbol interference mitigation effects of conventional Rake receiver for direct sequence code division multiple access (DS-CDMA) systems. The technique is based on preprocessing of signal at the transmitter relying on knowledge of the channel state information. This a priori information is available in time division duplex (TDD) mode due to channel reciprocity. In practice, errors in channel estimation occur due to time varying nature of mobile radio channels and also due to method adopted for channel estimation. Most of the previous works on Pre-Rake for TDD/DS-CDMA systems have not taken into consideration the effect of errors in channel estimation. In this paper, we analyze Pre-Rake performance under imperfect channel estimation with generalized orthogonal (GO) codes. We also present a pilot-based correlation method for channel estimation and evaluate the Pre-Rake system through analytical and computer simulations for TDD/DS-CDMA downlink.