Title :
MMSE interference suppression for coded multicarrier DS-CDMA in the presence of intermodulation
Author :
Xu, Weiping ; Milstein, Laurence B.
Author_Institution :
California Univ., San Diego, La Jolla, CA, USA
Abstract :
This paper presents a coded multicarrier (MC) DS-CDMA system which, by the use of a linear convolutional code (CC) and minimum mean-squared error (MMSE) receiver, achieves frequency diversity instead of path diversity as in a conventional single carrier RAKE DS-CDMA, and has the ability to partially compensate for the distortion introduced by a nonlinear amplifier at the transmitter. A frequency selective Rayleigh fading channel is decomposed into M frequency non-selective channels, based on the channel coherence bandwidth. A rate 1/M convolutional code, after being interleaved, is used to modulate M different DS-CDMA waveforms. The new system is shown to effectively suppress multiple access interference in the presence of intermodulation distortion
Keywords :
code division multiple access; convolutional codes; diversity reception; fading channels; interference suppression; least mean squares methods; modulation coding; radio receivers; radiofrequency interference; spread spectrum communication; MMSE interference suppression; channel coherence bandwidth; coded multicarrier DS-CDMA; distortion; frequency diversity; frequency nonselective channels; frequency selective Rayleigh fading channel; intermodulation; linear convolutional code; minimum mean-squared error; multiple access interference; nonlinear amplifier; rate 1/M convolutional code; Bandwidth; Coherence; Convolutional codes; Fading; Frequency diversity; Interference suppression; Multiaccess communication; Nonlinear distortion; RAKE receivers; Transmitters;
Conference_Titel :
Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5668-3
DOI :
10.1109/WCNC.1999.797791
