Title :
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
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;
Conference_Titel :
Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on
Conference_Location :
Mainz
Print_ISBN :
0-7803-3567-8
DOI :
10.1109/ISSSTA.1996.563462
