OFDM Mobile Packet Transmission System with Multiuser Detection and Metric Combining ARQ

Riichiro NAGAREDA  Kazuhiko FUKAWA  Hiroshi SUZUKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.1   pp.106-114
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.1.106
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Interference Canceller
Keyword: 
OFDM,  packet transmission,  ARQ,  multiuser detection,  metric combining,  

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Summary: 
This paper proposes an OFDM mobile packet transmission scheme that increases throughput by using nonlinear multiuser detection (MUD) and automatic repeat request (ARQ) with metric-combining. The scheme identifies users by detecting user identification (ID) symbols located at the head of a packet, and can separate packets that have collided by using MUD. It also forces the respective transmitters to retransmit the same packets so as to reproduce the collision if the cyclic redundancy check (CRC) detects some errors, and it uses metric-combining to decrease the number of retransmissions. The results of computer simulations show that the proposed scheme can provide twice the throughput of the conventional schemes.