Title :
Comparison of coherent and differential detection of BPSK and QPSK in a quasistatic fading channel
Author :
Chuang, Justin C I
Author_Institution :
Bell Commun. Res., Red Bank, NJ, USA
fDate :
5/1/1990 12:00:00 AM
Abstract :
The advantage of coherent detection over differential detection for quadrature phase-shift keying (QPSK) and binary phase-shift keying (BPSK) in a flat-fading channel is evaluated based on receiver-sensitivity analysis using three performance criteria. QPSK is concentrated upon to perform simulations for a frequency-selective fading channel. Spectral efficiency improvement due to better frequency reuse for the more sensitive coherent detection is evaluated with a combination of analysis and simulation. It is found that coherent detection with perfect carrier recovery is superior to differential detection by at least 2.4 dB, which converts to about a 30% improvement in spectral efficiency in a two-dimensional, frequency reuse system with a fourth-power propagation exponent. This advantage is preserved even if diversity selection is used to mitigate fading
Keywords :
diversity reception; fading; mobile radio systems; phase shift keying; signal detection; telecommunication channels; 2.4 dB; 2D frequency reuse system; 30 percent; BPSK; QPSK; binary phase-shift keying; carrier recovery; coherent detection; differential detection; diversity selection; fourth-power propagation exponent; frequency-selective fading channel; mobile rad quasistatic fading channel; quadrature phase-shift keying; receiver-sensitivity analysis; signal detection; spectral efficiency; Analytical models; Binary phase shift keying; Filtering; Frequency conversion; Frequency-selective fading channels; Helium; Phase detection; Quadrature phase shift keying; Sensitivity analysis; Time division multiple access;
Journal_Title :
Communications, IEEE Transactions on
