Paper Info
Title
Mld Interference Canceler for M-Array QAM Signals Applied to FWA Systems
Abstract
We propose a maximum likelihood detection (MLD) interference canceler applied to fixed wireless access (FWA) systems. There are two major degradation factors associated with a conventional MLD canceler. One is the decision error caused by constellation ambiguity when distinguishing between desired and interference signal components for M-array QAM signals. The novelty of our interference canceler is its use of our antenna switching technique to reduce constellation ambiguity. The phase difference between the desired and interference signals received by the main and sub antennas depends on the path gap between desired and interference signal transmitters to the two receiving antennas. Cancelation performance is improved by using the phase difference that maximizes the separation of the received signal points. Two key points of the proposed technique are the path gap and the threshold for antenna switching. The second degradation factor is the degradation in interference signal replica accuracy caused by the phase rotation of the interference signals. An automatic phase control (APC) circuit estimates and compensates for this phase rotation, enabling the interference canceler with APC to achieve excellent bit error rate (BER) performance. Computer simulations show that our interference canceler improves the BER performance.
Year
DOI
Venue
2009
10.1142/S0218126609005216
JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS
Keywords
Field
DocType
MLD,FWA,interference canceler,antenna switching
Replica,Maximum likelihood detection,Computer science,Adjacent-channel interference,QAM,Electronic engineering,Interference (wave propagation),Automatic phase control,Phase rotation,Bit error rate
Journal
Volume
Issue
ISSN
18
4
0218-1266
Citations 
PageRank 
References 
0
0.34
0
Authors
5
Name
Order
Citations
PageRank
Hiroshi Yoshioka100.68
Yushi Shirato2115.76
Kazuji Watanabe345.34
Keisuke Nakano421224.62
Masakazu Sengoku53315.91