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TMO Progress Report 42-136 February 15, 1999 Trellis-Coded Quadrature-Phase-Shift Keying (QPSK)
 

Summary: TMO Progress Report 42-136 February 15, 1999
Trellis-Coded Quadrature-Phase-Shift Keying (QPSK)
With Variable Overlapped Raised-Cosine
Pulse Shaping
M. K. Simon,1
P. Arabshahi,1
and M. Srinivasan1
This article introduces the notion of uncoded, partially overlapped, staggered
quadrature raised-cosine modulation (SQORC-P) as well as that of a trellis-coded
form that is implemented as a specific embodiment of the recently introduced cross-
correlated trellis-coded quadrature modulation (XTCQM). Consideration is given to
the power spectral density (PSD) of the scheme over both linear and nonlinear chan-
nels as well as to its average bit-error probability (BEP) performance on an additive
white Gaussian noise (AWGN) channel, the latter being characterized in terms of
tight upper and lower bounds. It is shown that a continuously variable trade-off
(as a function of the fractional overlap parameter, 0 1) between the rate of
spectral roll-off and the amount of envelope fluctuation of the transmitted signal is
achievable with a receiver average BEP performance that is virtually independent of
the value of and nominally equivalent to that of uncoded quadrature-phase-shift
keying (QPSK).

  

Source: Arabshahi, Payman - Applied Physics Laboratory & Department of Electrical Engineering, University of Washington at Seattle

 

Collections: Engineering