Influence of long code auto-correlation on RAKE reception performance in DS-CDMA mobile communications

Author

Suzuki, Hiroshi ; Fukawa, Kazuhiko

Author_Institution

NTT Mobile Commun. Network Inc., Yokosuka, Japan

Volume

3

fYear

1996

fDate

22-25 Sep 1996

Firstpage

1034

Abstract

This paper investigates the influence of long codes on RAKE reception in DS-CDMA mobile radio communications. Conventional DS-CDMA mobile communication systems employ long codes in order to “whiten” the interference signals from other cells. The conventional long code randomizes not only the undesired signals but also the different delay components of the desired signal which, therefore, become noise and are not combined in the RAKE processing. This phenomena impairs the RAKE performance. A method is proposed in order to reduce this impairment by introducing a new long code with higher correlation between chip intervals. An analysis shows the relationship between the auto-correlation and de-spread signals, and its influence on the BER performance. Finally, computer simulations verify the effectiveness of the proposed method

Keywords

cellular radio; code division multiple access; coding errors; correlation methods; error statistics; land mobile radio; pseudonoise codes; radio reception; radiofrequency interference; spread spectrum communication; BER performance; DS-CDMA mobile communications; RAKE reception performance; cellular radio; chip intervals; computer simulations; delay components; despread signals; interference signals; long code autocorrelation; long codes; Autocorrelation; Bit error rate; Delay; Interference; Land mobile radio; Mobile communication; Multiaccess communication; Performance analysis; Signal analysis; Signal processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on

Conference_Location

Mainz

Print_ISBN

0-7803-3567-8

Type

conf

DOI

10.1109/ISSSTA.1996.563462

Filename

563462