Title :
A coded VSB-QPSK transmission scheme for digital satellite communications in co-channel interference environments
Author :
Sugiyama, Takatoshi ; Kubota, Shuji ; Morikura, Masahiro ; Kato, Shuzo
Author_Institution :
NTT Wireless Syst. Labs., Yokosuka, Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
A coded VSB (vestigial side band)-QPSK (quadrature phase-shift keying) transmission scheme is proposed to realize interference-resistant digital satellite communication system. It uses an interference suppression filter to suppress the interference power in the receiving side. The suppressed power can be assigned to the transmission signals in advance by also using a same characteristic band limitation filter in the transmission side. Moreover, high coding-gain forward error correction (FEC) is employed to improve the degradation due to I and Q channel crosstalk by interference suppression. When a D/U (desired and undesired signal power ratio) equals 3 dB and a Δf/f N (Δf: interference frequency offset, f N: one-half the Nyquist bandwidth) equals 1.05, the proposed scheme achieves an Eb/No improvement of 7.3 dB in a CCI (co-channel interference) environment.
Keywords :
cochannel interference; digital communication; interference suppression; quadrature phase shift keying; satellite communication; I channel crosstalk; Q channel crosstalk; QPSK; band limitation filter; co-channel interference; co-channel interference environments; coded VSB; coded VSB-QPSK transmission; degradation; digital satellite communication; high coding-gain forward error correction; interference frequency offset; interference power; interference suppression filter; quadrature phase-shift keying; receiving side; transmission scheme; transmission signals; vestigial side band; Bandwidth; Crosstalk; Degradation; Filters; Forward error correction; Frequency; Interchannel interference; Interference suppression; Phase shift keying; Satellite communication;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
