A SVD-based location coding for cognitive radio in MIMO uplink channels

Authors:
Ioannis Krikidis
Affiliations:
Dept. of Computer Engineering & Informatics, University of Patras, Rio-Patras, Greece
Venue:
IEEE Communications Letters
Year:
2010

Citing 3
Cited 0

Fundamentals of wireless communication

Fundamentals of wireless communication
From spectrum pooling to space pooling: opportunistic interference alignment in MIMO cognitive networks

IEEE Transactions on Signal Processing
Space alignment for cognitive transmission in MIMO uplink channels

EURASIP Journal on Wireless Communications and Networking

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Abstract

This letter introduces a transmission technique for cognitive access in M × M Multiple-input multiple-output uplink channels. Based on an appropriate space alignment design, the cognitive channel is decomposed to M orthogonal Gaussian channels that overlap the primary eigenmodes and enable cognitive transmission in two ways (a) by transmitting cognitive data to the subchannels that overlap unused eigenmodes, (b) by transmitting a codeword of length M using the subchannel activity as a codeword pattern. The investigated technique overcomes limitations of previously reported approaches and guarantees a minimum cognitive data rate equal to the number of antennas.