Title :
A modified sequential beamforming algorithm for cochannel IS-136 signals
Author :
Chandrasekaran, Rajiv ; Keerthi, Arvind V. ; Shynk, John J.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
Cochannel signals in a time-division multiple-access (TDMA) cellular network interfere with each other in an asynchronous manner. In order to demodulate one of these signals, the receiver must be able to separate the cochannel interferers for a variety of burst overlap scenarios. We present an adaptive beam-forming algorithm that separates cochannel IS-136 signals using the known synchronization sequences. It employs constrained least-squares algorithms that process the antenna data in two sequential passes. In this way, the data are accurately beamformed within a burst even when the cochannel scenario changes during the burst.
Keywords :
array signal processing; cellular radio; cochannel interference; demodulation; direction-of-arrival estimation; land mobile radio; least squares approximations; radio networks; radio receivers; synchronisation; time division multiple access; TDMA; adaptive beam-forming algorithm; antenna data processing; cellular network; channel model; cochannel IS-136 signals; cochannel bursts; constrained least-squares algorithms; demodulation; modified sequential beamforming algorithm; receiver architecture; signal model; synchronization sequences; time-division multiple-access; Antenna arrays; Array signal processing; Base stations; Delay; Frequency synchronization; Interchannel interference; Interference constraints; Land mobile radio cellular systems; Telephony; Time division multiple access;
Conference_Titel :
Signals, Systems & Computers, 1997. Conference Record of the Thirty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-8186-8316-3
DOI :
10.1109/ACSSC.1997.679166
