Title :
Training sequence based multiuser channel identification for cochannel interference cancellation in GSM
Author :
Trigui, Hafedh ; Slock, Dirk T M
Author_Institution :
Inst. EURECOM, Sophia Antipolis, France
Abstract :
We address the problem of the joint identification of the channel impulse responses of almost-synchronous cochannel users. This problem arises in a cellular system using the time division multiple access (TDMA) scheme where the base stations are assumed to be synchronized and the radius of the cells is limited to a few kilometers. After the partial equalization of the transmit pulse shape filter which compensates for the intersymbol interference (ISI) introduced by the GMSK modulation (used in GSM), the receiver should detect the active training sequences by a synchronization step and then estimates the corresponding channel impulse responses by the standard least squares (LS) method. The spatio-temporal receiver used in our simulations for demodulating the signal of interest modeling the interferers as Gaussian colored noise is the interference cancelling matched filter (ICMF) which we introduced previously
Keywords :
Gaussian noise; cellular radio; cochannel interference; demodulation; digital radio; equalisers; identification; interference suppression; intersymbol interference; least squares approximations; matched filters; minimum shift keying; multiuser channels; radio receivers; sequences; synchronisation; time division multiple access; transient response; CCI; GMSK modulation; GSM; Gaussian colored noise; ISI compensation; TDMA; active training sequences; almost-synchronous cochannel users; base stations; cell radius; cellular system; channel impulse response; cochannel interference cancellation; digital cellular system; interference cancelling matched filter; intersymbol interference; joint identification; least squares method; partial equalization; receiver; signal demodulation; simulations; spatio-temporal receiver; synchronization; time division multiple access; training sequence based multiuser channel identification; transmit pulse shape filter; Base stations; Filters; GSM; Intersymbol interference; Least squares approximation; Multiuser channels; Pulse modulation; Pulse shaping methods; Shape; Time division multiple access;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 1999. SPAWC '99. 1999 2nd IEEE Workshop on
Conference_Location :
Annapolis, MD
Print_ISBN :
0-7803-5599-7
DOI :
10.1109/SPAWC.1999.783029