Title :
Mismatched-filtering of concatenated spreading sequences for approximately synchronized CDMA-systems
Author :
Elders-Boll, Harald ; Schotten, Hans Dieter ; Busboom, Axel
Author_Institution :
Inst. of Commun. Eng., Tech. Hochschule Aachen, Germany
fDate :
28 Apr-1 May 1996
Abstract :
A new method for the construction of spreading sequences for approximately synchronized DS-CDMA systems is proposed. The construction method is based on the concatenation of a binary inverse-filtered inner sequence with outer sequences of a family of binary sequences. If the outer sequences are chosen to be the columns of a Hadamard matrix the system exhibits nearly no cross-interference. Using the proposed sequences, it is possible to combine the advantages of asynchronous and synchronous CDMA systems in a so-called partly-synchronous CDMA system
Keywords :
Hadamard matrices; binary sequences; cellular radio; code division multiple access; concatenated codes; filtering theory; interference suppression; inverse problems; land mobile radio; pseudonoise codes; radiofrequency interference; spread spectrum communication; synchronisation; DS-CDMA; Hadamard matrix; approximately synchronized CDMA-systems; asynchronous CDMA systems; binary inverse-filtered inner sequence; concatenated spreading sequences; cross-interference; mismatched-filtering; outer sequences; partly-synchronous CDMA system; synchronous CDMA systems; Code division multiplexing; Concatenated codes; Delay effects; Interchannel interference; Multiaccess communication; Multiple access interference; Phase modulation; Signal processing; System performance; Timing;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.504053
