Title :
Combined multiuser reception and channel decoding for TDMA cellular systems
Author :
Valenti, Matthew C. ; Woerner, Brian D.
Author_Institution :
Mobile & Portable Radio Res. Group, Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
This paper presents a method of combating the detrimental effects of multiple-access interference present in coded time division multiple access (TDMA) systems. The optimal asynchronous multiuser detector is adapted for use by TDMA systems, which are characterized by a single desired user and a small number of strong interferers operating in adjacent cells with identical spreading codes. The proposed receiver features a soft-input/soft-output (SISO) multiuser detector and a SISO channel decoder operating in an iterative feedback, or “turbo” configuration. Simulation results are shown for the case when two users, the desired user and one strong interferer, are jointly detected and each user employs a weak recursive systematic convolutional code
Keywords :
cellular radio; cochannel interference; convolutional codes; decoding; feedback; iterative methods; radio receivers; signal detection; spread spectrum communication; time division multiple access; SISO channel decoder; TDMA cellular systems; adjacent cells; channel decoding; cochannel interference; coded time division multiple access; iterative feedback; joint detection; multiple-access interference; multiuser reception; optimal asynchronous multiuser detector; receiver architecture; simulation results; soft-input/soft-output; spreading codes; strong interferer; turbo configuration; weak recursive systematic convolutional code; Convolutional codes; Detectors; Error correction codes; GSM; Interchannel interference; Iterative decoding; Multiuser detection; Radiofrequency interference; Time division multiple access; Viterbi algorithm;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686089
