Abstract
The inter- and intrasite correlation properties of shadow fading and power-weighted angle spread at both the mobile station and the base station are studied utilizing narrowband multisite MIMO measurements in the 1800MHz band. The influence of the distance between two base stations on the correlation is studied in an urban environment. Measurements have been conducted for two different situations: widely separated as well as closely located base stations. Novel results regarding the correlation of the power-weighted angle spread between base station sites with different separations are presented. Furthermore, the measurements and analysis presented herein confirm the autocorrelation and cross-correlation properties of the shadow fading and the angle spread that have been observed in previous studies.
Highlights
As the demand for higher data rates increases faster than the available spectrum, more efficient spectrum utilization methods are required
We studied the correlation properties of the three large-scale parameters shadow fading, base station power-weighted angle spread, and mobile station power-weighted angle spread
The results in [12] on the distribution and autocorrelation of shadow fading and base station angle spread were confirmed the standard deviations of the angular spread and shadow fading were slightly smaller in our measurements
Summary
The wireless channel is very complex and consists of time varying multipath propagation and scattering. The term large-scale parameters was used [3] for a collection of quantities that can be used to describe the characteristics of a MIMO channel. This collection of parameters are termed large scale because they are assumed to be constant over “large” areas of several wavelengths. These parameters are assumed to depend on the local environment of the transmitter and receiver. The angle spread parameter will be different for the transmitter (Tx) and receiver (Rx) sides of the link, since it largely depends on the amount of local scat-. A description of the other LS parameters may be found in [3]
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