DocumentCode :
2651597
Title :
Pre-RAKE diversity combination for direct sequence spread spectrum communications systems
Author :
Esmailzadeh, Riaz ; Nakagawa, Masao
Author_Institution :
Dept. of Electr. Eng., Keio Univ., Yokohama, Japan
Volume :
1
fYear :
1993
fDate :
23-26 May 1993
Firstpage :
463
Abstract :
A novel method of multipath diversity signal combination is proposed for mobile direct sequence spread spectrum (DS-SS) communications. Multiple transmissions are made for each spread signal. Each transmission is independently delayed and amplified in the complex domain according to the delay profile and the estimated path strength of the channel. This is done to facilitate reception of a signal at the mobile unit which is already a RAKE combination of the multipath signals. This method is called a pre-RAKE combination system because the RAKE combination function is performed pre-transmission. Using this method the size and complexity of the mobile unit can be kept to a minimum. The pre-RAKE method retains the advantages of diversity reception in a multi-path fading environment. An examination of the SNR for the traditional RAKE and the pre-RAKE systems and computer simulations show that the performance of the pre-RAKE system is equivalent to that of the RAKE system
Keywords :
delays; diversity reception; fading; land mobile radio; multipath channels; pseudonoise codes; spread spectrum communication; SNR; complex domain; complexity; computer simulations; direct sequence spread spectrum communications; mobile unit; multipath diversity signal combination; pre-RAKE combination system; Bit error rate; Control systems; Delay; Diversity reception; Fading; Mobile communication; Open loop systems; RAKE receivers; Signal to noise ratio; Spread spectrum communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 1993. ICC '93 Geneva. Technical Program, Conference Record, IEEE International Conference on
Conference_Location :
Geneva
Print_ISBN :
0-7803-0950-2
Type :
conf
DOI :
10.1109/ICC.1993.397307
Filename :
397307
Link To Document :
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