Separable implementation of L2-orthogonal STC CPM with fast decoding

Authors:
Matthias Hesse;Jerome Lebrun;Lutz Lampe;Luc Deneire
Affiliations:
Laboratoire I3S, CNRS, University of Nice, Sophia Antipolis, France;Laboratoire I3S, CNRS, University of Nice, Sophia Antipolis, FranceUniversity of Nice, Sophia Antipolis, France;Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada;Laboratoire I3S, CNRS, University of Nice, Sophia Antipolis, FranceUniversity of Nice, Sophia Antipolis, France
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

In this paper we present an alternative separable implementation of L2-orthogonal space-time codes (STC) for continuous phase modulation (CPM). In this approach, we split the STC CPM transmitter into a single conventional CPM modulator and a correction filter bank. While the CPM modulator is common to all transmit antennas, the correction filter bank applies different correction units to each antenna. Thereby desirable code properties as orthogonality and full diversity are achievable with just a slightly larger bandwidth demand. This new representation has three main advantages. First, it allows to easily generalize the orthogonality condition to any arbitrary number of transmit antennas. Second, for a quite general set of correction functions that we detail, it can be proved that full diversity is achieved. Third, by separating the modulation and correction steps inside the receiver, a simpler receiver can be designed as a bank of data independent inverse correction filters followed by a single CPM demodulator. Therefore, in this implementation, only one correlation filter bank for the detection of all transmitted signals is necessary. The decoding effort grows only linearly with the number of transmit antennas.