Title :
Characterization of WSSUS channels: normalized mean square covariance
Author :
Yoo, Do-Sik ; Stark, Wayne E.
Author_Institution :
Samsung Electron. Co. Ltd., Seoul, South Korea
fDate :
7/1/2005 12:00:00 AM
Abstract :
A set of second-order statistics collectively called normalized mean square covariance (NMSV) are defined to characterize the frequency and/or the time selectivity of wide-sense stationary uncorrelated scattering (WSSUS) channels. Normalized frequency mean square covariance (NFMSV) quantifies the frequency selectivity, while normalized time mean square covariance (NTMSV) characterizes the time selectivity. Normalized frequency-time mean square covariance is defined to characterize the combined effect of frequency and time selectivities. The NMSVs of a WSSUS channel can be computed easily from the scattering function. We show that there is a very close relationship between the NMSV of a WSSUS channel and the performance of various diversity combing schemes. Also we discuss, with practical system design problems, how useful the parameters are for efficient system design.
Keywords :
covariance analysis; diversity reception; mean square error methods; scattering; telecommunication channels; time-frequency analysis; WSSUS channel; coherence bandwidth; correlation time; diversity combing scheme; frequency selectivity; normalized mean square covariance; root mean square delay spread; second-order statistics; time selectivity; wide-sense stationary uncorrelated scattering channel; Bandwidth; Delay effects; Electromagnetic scattering; Fading; Frequency; Mobile communication; Root mean square; Shadow mapping; Statistics; System performance; Coherence bandwidth; correlation time; frequency selectivity; normalized frequency mean square covariance (NFMSV); normalized frequency-time mean square covariance (NFTMSV); normalized mean square covariance (NMSV); normalized time mean square covariance (NTMSV); root mean square (rms) delay spread; time selectivity; wide-sense stationary uncorrelated scattering (WSSUS) channel;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2004.843046
