Title :
Modulation techniques for on-board processing satellite communications
Author :
Majeed, Radde M. ; McLane, Peter J.
Author_Institution :
Dept. of Electr. Eng., Queen´´s Univ., Kingston, Ont., Canada
fDate :
12/1/1997 12:00:00 AM
Abstract :
The uplink channel from a terminal to a regenerative satellite repeater is considered in which a digital transmultiplexer (TMUX) is used as a frequency-division multiple-access (FDMA) to time-division-multiplexed (TDM) converter for group demodulation. Linear modulation techniques were considered to determine which would make the most efficient use of this on-board processing (OBP) satellite system. The modulation techniques examined were quadrature phase-shift keying (QPSK), π/4-QPSK, and offset QPSK (OQPSK), all with Nyquist pulse shaping, and minimum-phase keying (MSK). The search for the optimum linear modulation technique took into account the performance criteria of power efficiency, bandwidth efficiency, and especially the complexity of the TMUX algorithm for OBP
Keywords :
computational complexity; frequency division multiple access; minimum shift keying; quadrature phase shift keying; satellite communication; time division multiplexing; transmultiplexing; π/4-QPSK; FDMA to TDM converter; Nyquist pulse shaping; OBP; QPSK; TMUX algorithm complexity; bandwidth efficiency; digital transmultiplexer; frequency-division multiple-access; group demodulation; high power amplifier; minimum-phase keying; modulation techniques; offset QPSK; on-board processing satellite communications; optimum linear modulation technique; performance criteria; power efficiency; quadrature phase-shift keying; regenerative satellite repeater; time-division-multiplexing; uplink channel; Demodulation; Digital-to-frequency converters; Frequency conversion; Frequency division multiaccess; Phase modulation; Pulse modulation; Quadrature phase shift keying; Repeaters; Satellites; Time division multiplexing;
Journal_Title :
Communications, IEEE Transactions on
