Title :
Linear MMSE interference suppression in asynchronous random-CDMA
Author_Institution :
Centre for Wireless Commun., Waterloo Univ., Ont., Canada
Abstract :
This paper considers interference suppression, based on linear minimum mean square error (MMSE) filtering, in random code-division multiple-access (random-CDMA) systems such as IS-95 and wideband-CDMA using long pseudo-noise (PN) sequences. It examines the design of the MMSE receiver and its performance in terms of probability of bit error (Pe). Expressions for Pe are derived for systems with multiple bit rates (and spreading factors), variable signal powers and chip pulse shaping. Numerical examples show substantial Pe gains in systems with one to two high-powered users and square-root raised cosine (Sqrt-RC) pulse shaping with 100% excess bandwidth
Keywords :
AWGN channels; broadband networks; code division multiple access; error statistics; filtering theory; interference suppression; land mobile radio; least mean squares methods; pseudonoise codes; pulse shaping; radio networks; radio receivers; radiofrequency interference; random processes; sequences; AWGN channel; IS-95; MMSE receiver; PN sequences; SNR; asynchronous random-CDMA systems; bit error probability; chip pulse shaping; excess bandwidth; high-powered users; linear MMSE filtering; linear MMSE interference suppression; long pseudo-noise sequences; minimum mean square error; multiple bit rates; performance; random code-division multiple-access; spreading factors; square-root raised cosine pulse shaping; system model; variable signal powers; wideband-CDMA; AWGN; Bit rate; Filtering; Interference suppression; Multiaccess communication; Multiple access interference; Nonlinear filters; Performance analysis; Pulse shaping methods; Wireless communication;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851369
