Stochastic Degree of Freedom and WSSUS Channel Diversity
نویسندگان
چکیده
In this letter, the concept of stochastic degree of freedom (SDF) is introduced as the dual concept of normalized mean square covariance (NMSV) for general L2 stochastic processes. We consider the discrete-time representations of bandwidth and time limited WSSUS channels and show how the normalized mean square covariances can be computed for the equivalent discrete-time channels. Then, we use the SDF to quantify the frequency and/or time diversity order of WSSUS channels and interpret their physical meaning.
منابع مشابه
Time-scale domain characterization of non-WSSUS wideband channels
To account for nonstationarity, channel characterization and system design methods that employ the non-widesense stationary uncorrelated scattering (non-WSSUS) assumption are desirable. Furthermore, the inadequacy of the Doppler shift operator to properly account for the frequency shift in wideband channel implies that the timefrequency characterization methods that employ the Doppler shift ope...
متن کاملInformation Theory of Underspread WSSUS Channels
In this chapter, we are interested in the ultimate limit on the rate of reliable communication over Rayleigh-fading channels that satisfy the wide-sense stationary (WSS) and uncorrelated scattering (US) assumptions and are underspread [Bel63, Ken69]. Therefore, the natural setting is an information-theoretic one, and the performance metric is channel capacity [CT91, Gal68]. The family of Raylei...
متن کاملNormalized Mean Square Covariance and Diversity Combining under WSSUS Channels
In this letter, we investigate the fundamental relationship between the performance of a maximum ratio diversity combining scheme and the normalized mean square covariance (NMSV) under wide-sense stationary uncorrelated scattering (WSSUS) channels. In particular, we show that the reliability achieved by diversity combining is closely related to the value of NMSV of the channel under consideration.
متن کاملStatistical Properties of Correlation on WSSUS Channels
To properly characterize the frequency and time selectivity of the fading channel, there several models used to simulate the channel, most of them based in the Jake’s simulator. In this work the second order statistics of this simulator are compared to actual measurements. The second-order statistics level crossing rate (LCR) and average duration of fading (ADF) of a random process transmits us...
متن کاملEstimation of NON-WSSUS Channel for OFDM System: Exploiting Support Correlations through a Novel Adaptive Weighted Predict-Re-Estimate L1 Minimization
—It is challenging to estimate the wireless channel of the Orthogonal Frequency-Division Multiplexing (OFDM) broadband system under a changing communication environment. The difficulty is mainly attributed to this wireless channel’s Non Wide Sense Stationary Uncorrelated Scattering (Non-WSSUS) which has an implication that the delay and Doppler shift of such a channel are non-stationary and co...
متن کامل