Title :
Using higher order constellations with minimum mean square error (MMSE) receiver for severe multipath CDMA channel
Author :
Shamain, Prasad ; Milstein, Laurence B.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
Abstract :
Third generation wireless systems are expected to be characterized by high data rates and multimedia traffic. This paper is a preliminary investigation to determine if two dimensional higher order constellations, in conjunction with code division multiple access (CDMA), can be used to support the data communication needs of such systems. We compare the performance of QPSK and 16-QAM in a high multipath environment when either conventional matched filters (MF) or minimum mean square error (MMSE) receivers are used. We substantiate the results of semi-analytical calculations of the error rate with simulations, and conclude that the use of a higher order constellation can improve the system performance when the multipath is sufficiently severe
Keywords :
cellular radio; code division multiple access; fading channels; least mean squares methods; matched filters; multimedia communication; multipath channels; multiuser channels; quadrature amplitude modulation; quadrature phase shift keying; receivers; spread spectrum communication; telecommunication traffic; 16-QAM; 2D higher order constellations; DS-CDMA; QPSK; adaptive MMSE receiver; cellular system; code division multiple access; data communication; error rate; high data rates; interference suppression; matched filters; minimum mean square error; multimedia traffic; multipath CDMA channel; performance; simulations; system performance; third generation wireless systems; Data communication; Delay; Error analysis; Fading; Matched filters; Maximum likelihood detection; Mean square error methods; Multiaccess communication; Power control; Quadrature phase shift keying;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1998. The Ninth IEEE International Symposium on
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-4872-9
DOI :
10.1109/PIMRC.1998.731333
