Title :
Reduction of mixed co-channel interference in microcellular STDD systems
Author :
Papadopoulos, Haralabos C. ; Sundberg, Carl Erik W
Author_Institution :
Res. Lab. of Electron., MIT, Cambridge, MA, USA
Abstract :
STDD (shared time division duplexing) is an attractive candidate for high quality, low delay multiple access in microcellular systems. We show by means of theoretical analysis that STDD is superior to conventional TDMA as well as TDMA with slow speech activity detection (SAD) in terms of capacity. We demonstrate how a type of mixed co-channel interference particular to STDD can be eliminated by means of directional antennas at the base stations for both reception and transmission, combined with appropriate organization of the time burst. Numerical results are given for a frame length of 2 ms. Capacity gains of the order of 100% over TDMA are obtained with 40 speech slots per frame and a packet dropping rate of 0.1%
Keywords :
cellular radio; cochannel interference; directive antennas; interference suppression; land mobile radio; radiofrequency interference; time division multiple access; time division multiplexing; STDD systems; TDMA; base stations; capacity gain; directional antennas; frame length; low delay multiple access; microcellular systems; mixed co-channel interference reduction; numerical results; packet dropping rate; shared time division duplexing; time burst; Base stations; Delay effects; Directional antennas; Downlink; Interchannel interference; Laboratories; Personal communication networks; Protocols; Speech analysis; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1995 IEEE 45th
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-2742-X
DOI :
10.1109/VETEC.1995.504970
