Title :
MMSE detection in asynchronous CDMA systems: an equivalence result
Author :
Mantravadi, Ashok ; Veeravalli, Venugopal V.
Author_Institution :
Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA
fDate :
12/1/2002 12:00:00 AM
Abstract :
The analysis of linear minimum mean-square error (MMSE) detection in a band-limited code-division multiple-access (CDMA) system that employs random spreading sequences is considered. The key features of the analysis are that the users are allowed to be completely asynchronous, and that the chip waveform is assumed to be the ideal Nyquist sinc function. It is shown that the asymptotic signal-to-interference ratio (SIR) at the detector output is the same as that in an equivalent chip-synchronous system. It is hence been established that synchronous analyses of linear MMSE detection can provide useful guidelines for the performance in asynchronous band-limited systems.
Keywords :
bandlimited communication; code division multiple access; least mean squares methods; multiuser channels; radiofrequency interference; signal detection; spread spectrum communication; asymptotic SIR; asynchronous CDMA systems; asynchronous band-limited systems; band-limited CDMA system; chip waveform; chip-synchronous system; code-division multiple-access; ideal Nyquist sine function; linear MMSE detection; linear minimum mean-square error detection; random spreading sequences; signal-to-interference ratio; synchronous analyses; Delay; Detectors; Guidelines; Least mean squares methods; Matched filters; Mean square error methods; Multiaccess communication; Multiuser detection; Performance analysis; Subcontracting;
Journal_Title :
Information Theory, IEEE Transactions on
DOI :
10.1109/TIT.2002.805078
