Linear precoding with arbitrary signaling

ABSTRACT: Since the pioneering work by Telatar in 1995/1999, it is known that, within the framework of linear vector Gaussian channels, the optimal signaling strategy from an information-theoretic perspective is to transmit, through the channel eigenmodes, a set of independent Gaussian codes whose power is distributed according to the waterfilling policy. However, the ideal Gaussian signals cannot currently be implemented in practice and discrete signaling constellations, such as BPSK or M-QAM, are used instead. In this new practical scenario, where the signaling is constrained a priori, the optimal transmit strategy that maximizes the mutual information is not known anymore. In this talk, we review the state-of-the-art of transmitter design to maximize the mutual information and present our contribution to the characterization of the optimal linear precoder for linear vector Gaussian channels with arbitrary signaling.

SPEAKER: Miquel Payaró received the Electrical Engineering and the Ph.D. degrees from the Universitat Politècnica de Catalunya (UPC), Barcelona, Spain, in 2002 and 2007, respectively. Miquel conducted his Ph.D. studies at the Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Barcelona and from September 2005 to February 2006 he held a visiting research appointment at the University of New South Wales (UNSW), Sydney, Australia. From February 2007 to December 2008 he was a Post Doctoral Research Associate in the Department of Electronic and Computer Engineering at the Hong Kong University of Science and Technology (HKUST) under the supervision of Dr. Daniel P. Palomar.