Title :
Iterative interference cancellation for high spectral efficiency satellite communications
Author :
Beidas, Bassel F. ; El Gamal, Hesham ; Kay, Stan
Author_Institution :
Hughes Network Syst. Inc., Germantown, MD, USA
fDate :
1/1/2002 12:00:00 AM
Abstract :
The problem of efficient utilization of the frequency spectrum for satellite systems is investigated; one which results as a consequence of highly crowding adjacent channels. An analytical characterization of the resulting interference channel is introduced and then exploited for interference cancellation. Two classes of cancelers are investigated. The first approach does not benefit from the forward error control (FEC) coding information which limits the performance gain. This motivates the second approach where a joint implementation of interference cancellation and decoding is developed using soft-input-soft-output (SISO) modules along with the iterative structure. It is shown that iterative interference cancellation techniques can achieve significant gains compared with the single-user matched filter receiver
Keywords :
Viterbi decoding; adjacent channel interference; code division multiple access; error correction codes; forward error correction; interference suppression; iterative methods; multiuser channels; satellite communication; turbo codes; AWGN; CDMA signals; FEC coding; SISO modules; SOVA; additive white Gaussian noise; adjacent interference channel; decoding; forward error control; frequency spectrum utilization; high spectral efficiency satellite communications; interference cancellation; iterative interference cancellation; performance gain; single-user matched filter receiver; soft output Viterbi algorithm; soft-input-soft-output modules; turbo interference cancellation; Error correction; Forward error correction; Frequency; Interference cancellation; Interference channels; Iterative decoding; Iterative methods; Matched filters; Performance gain; Satellites;
Journal_Title :
Communications, IEEE Transactions on
