Title :
Higher order constellation with simplified minimum mean square error (MMSE) receiver in CDMA channel with tone interference
Author :
Shamain, Prasad ; Milstein, Laurence B.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
Abstract :
It has previously been shown that employing a higher order constellation in conjunction with CDMA can improve the performance of the multiuser system in the presence of severe ISI and narrowband Gaussian interference. We study a similar scenario here, except that the narrowband Gaussian interferer is replaced with a tone interferer. It is shown that the use of the higher order alphabet size is also useful in the tone interference case. Also, we derive lower and upper bounds on the performance of an MMSE receiver in a multiuser, flat fading scenario. Later we apply the same technique to a multiuser, frequency selective fading scenario with negligible or mild ISI
Keywords :
Rayleigh channels; code division multiple access; intersymbol interference; land mobile radio; least mean squares methods; multipath channels; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; CDMA channel; ISI; WLAN; higher order alphabet size; higher order constellation; multiuser flat fading; multiuser frequency selective fading; performance; simplified minimum mean square error receiver; tone interference; tone interferer; wireless LAN; Delay lines; Fading; Frequency; Intersymbol interference; Mean square error methods; Multiaccess communication; Narrowband; Quadrature phase shift keying; Rayleigh channels; Upper bound;
Conference_Titel :
Communications, 2000. ICC 2000. 2000 IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-6283-7
DOI :
10.1109/ICC.2000.853743
