Title :
A statistical characterization of point-to-point microwave links using biased Rayleigh distributions
Author :
Martin, Andrew L. ; Vu-Dinh, Tuong
Author_Institution :
Martin Commun. Pty. Ltd., Waverley, Vic., Australia
fDate :
5/1/1997 12:00:00 AM
Abstract :
A multipath fading model has been used to examine the characteristics of a point-to-point microwave radio channel. The new attributes of this model that differ from other multipath models enable the incorporation of the ideas of fading severity and time variability. This is achieved by the use of a biased Rayleigh-distributed second (interfering) ray. The biasing constant determines the fading severity, while the Rayleigh cutoff frequency determines the rate-of-change of the channel. For point-to-point microwave radio channels, this model provides narrow-band fading signal-level distributions that completely replicate the Norton or Nakagami-Rice distributions while at the same time providing signal level distributions that replicate those obtained from broad-band measurements. Thus, this model unifies the narrow-band and broadband multipath fading models. Using this model, nondiversity and diversity system operation is investigated and the concept of a broad-band correlation coefficient introduced. The distributions of notch speed are also investigated. Software simulation results are compared with some hardware simulation results and field measurements
Keywords :
correlation methods; digital radio; diversity reception; fading; linear systems; microwave links; microwave propagation; multipath channels; probability; time-varying channels; Nakagami-Rice distribution; Norton distribution; Rayleigh cutoff frequency; biased Rayleigh distributions; biased Rayleigh-distributed interfering ray; biasing constant; broadband correlation coefficient; broadband measurements; broadband multipath fading models; digital radio; diversity system; fading severity; field measurements; hardware simulation results; microwave propagation; microwave radio channel; narrowband fading signal level distributions; narrowband multipath fading models; nondiversity system; notch speed; point to point microwave links; software simulation results; statistical characteristics; time variability; Cutoff frequency; Distortion measurement; Fading; Microwave devices; Microwave measurements; Nakagami distribution; Narrowband; Rayleigh channels; Relays; Time measurement;
Journal_Title :
Antennas and Propagation, IEEE Transactions on