Title :
Asymptotic analysis of 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
Abstract :
We consider the analysis of linear MMSE detection in a CDMA system that employs random spreading sequences. The key features of the analysis are that the users are allowed to be completely asynchronous and the chip waveform is assumed to be the ideal band-limited sine waveform. We show that the asymptotic signal to interference ratio (SIR) at the detector output is the same as that in an equivalent chip synchronous system. Hence, synchronous analyses 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; MMSE detection; SIR; asymptotic analysis; asymptotic signal to interference ratio; asynchronous CDMA systems; asynchronous band-limited systems; chip synchronous system; chip waveform; ideal band-limited sine waveform; linear MMSE detection; random spreading sequences; Bandwidth; Delay; Filtering; Gas detectors; Interference; Multiaccess communication; Random sequences; Statistics;
Conference_Titel :
Information Theory, 2001. Proceedings. 2001 IEEE International Symposium on
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-7123-2
DOI :
10.1109/ISIT.2001.936169
