| Macrocell-Wide Behavior of the Orthogonality Factor in WCDMA Downlinks |
| Citation: |
* Mehta, N.B.; Molisch, A.F.; Greenstein, L.J., "Macrocell-Wide Behavior of the Orthogonality Factor in WCDMA Downlinks", IEEE Transactions on Wireless Communications, ISSN: 1536-1276, Vol. 5, Issue 12, pp. 3394-3399, December 2006 (IEEE Xplore) |
| Date: | December 2006 |
| MERL Contact: | Andreas F. Molisch |
The orthogonality factor (OF) quantifies the loss of orthogonality between the signals transmitted simultaneously on a wideband code division multiple access (WCDMA) downlink due to multipath dispersion. It is one of the fundamental parameters that determines the signal-to-interference-plus-noise ratio at the output of the Rake receiver and, consequently, it has a significant impact on downlink system capacity. The OF depends greatly on the delay profile of the multipath channel between the mobile and its serving base station; this profile varies considerably from one location in the cell to another. In this paper, we study how the statistical properties of the small-scale-fading-averaged OF vary over the entire macrocellular area. We use an ensemble of channel profiles at different locations in a cell generated from an implementation of the comprehensive COST259 channel model, which incorporates results from several experimental investigations. We show that the small-scale-fading-averaged OF is itself a random variable whose statistics depend on the mobile's distance from its serving base station. The large observed variance of the OF indicates that using a single value for all users in downlink capacity analyses and simulations, as has been the practice, may lead to erroneous conclusions. Finally, we propose a simple model that closely matches the statistics of the OF as a function of mobile-to-base distance, thus obviating the need to set up the complicated channel model every time OF values are to be generated. |
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