Accession Number : ADA185838

Title :   Quadrature-Quadrature Phase Shift Keying.

Descriptive Note : Technical rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR COMMUNICATIONS AND SIGNAL PROCESSING LAB

Personal Author(s) : Saha, Debabrata

PDF Url : ADA185838

Report Date : Sep 1986

Pagination or Media Count : 118

Abstract : Quadrature-Quadrature phase shift keying (Q2PSK) is a new spectrally efficient modulation scheme which can be considered as two minimum shift keying type signalling schemes in parallel. It uses two data shaping pulses and two carriers which are pairwise quadrature in phase; the scheme thus utilizes available signal space dimensions in an efficient way to increase the bandwidth efficiency by a factor of two over two dimensional schemes such as QPSK, MSK, TFM. The bit error rate performance, however, depends on the choice of the data shaping pulse pair. With simple cosinusoidal and sinusoidal data shaping pulses the Eb/NO requirement is approximately 1.6 dB higher than that of MSK and 0.6 dB higher than that of TFM. With the suboptimum pulse shapes discussed in chapter six, the bit error rate performance of Q2PSK becomes closer to that of MSK, through for a given bandwidth the transmission rate in Q2PSK remains twice the rate in MSK.

Descriptors :   *BANDWIDTH, *EFFICIENCY, *ERRORS, *PULSES, *RATES, *SHAPE, DATA RATE, DATA TRANSMISSION SYSTEMS, REQUIREMENTS, TWO DIMENSIONAL

Subject Categories : Command, Control and Communications Systems
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE