Signal Representations for Transmit - ReceiveAntenna Arrays
نویسندگان
چکیده
We propose a signal representation for transmit-receive uniform linear arrays operating over arbitrary time-varying spatial multipath channels encountered in mobile communications. The signal representation decomposes the multipath channel into a nite number of virtual channels that correspond to certain delays, Doppler shifts, angles that are xed a priori and are independent of the physical channel parameters. Temporal channel variations are captured linearly by the variations in the fading coeecients associated with the virtual channels. The utility of the canonical signal representation is illustrated with simple transceiver structures. The signal representation entails simple channel estimation procedures and can be leveraged for a variety of physical layer functions, including diversity signaling, spatially-selective multiuser signaling, and space-time coding.
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