Title :
The impact of frequency-flat fading on the spectral efficiency of CDMA
Author :
Shamai, Shlomo ; Verdú, Sergio
Author_Institution :
Dept. of Electr. Eng., Technion-Israel Inst. of Technol., Haifa, Israel
fDate :
5/1/2001 12:00:00 AM
Abstract :
The capacity of the randomly spread synchronous code-division multiple-access (CDMA) channel subject to frequency-flat fading is studied in the wide-band limit of large number of users. We find the spectral efficiency as a function of the number of users per chip, the distribution of the flat fading, and the signal-to-noise ratio (SNR), for the optimum receiver as well as linear receivers (single-user matched filter, decorrelator, and minimum mean-square error (MMSE)). The potential improvements due to both decentralized transmitter power control and multi-antenna receivers are also analyzed
Keywords :
antenna arrays; channel capacity; code division multiple access; decorrelation; fading channels; least mean squares methods; matched filters; power control; radio receivers; radio transmitters; telecommunication control; CDMA; capacity; decentralized transmitter power control; decorrelator; frequency-flat fading; linear receivers; minimum mean-square error; multi-antenna receivers; optimum receiver; randomly spread synchronous code-division multiple-access channel; signal-to-noise ratio; single-user matched filter; spectral efficiency; wide-band limit; Decorrelation; Detectors; Fading; Frequency; Matched filters; Multiaccess communication; Power control; Signal to noise ratio; Transmitters; Wideband;
Journal_Title :
Information Theory, IEEE Transactions on
