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One of the most powerful techniques to mitigate the performance degradation on fading channels is by the use of diversity. Any diversity technique (e.g., space, time and frequency) tries to provide statistically independent copies of the transmitted sequence at the receiver for reliable detection. Signal Space Diversity (SSD) can provide performance improvement over fading channels without using extra bandwidth and power expansion. The basic premise of SSD is that multidimensional signal constellations are used and the components of the each signal constellation point are transmitted over independent fading channels.
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