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Abstract: In this paper we present an alternative separable implementation ofL2-orthogonal space-time codes STC for continuous phase modulation CPM. Inthis approach, we split the STC CPM transmitter into a single conventional CPMmodulator and a correction filter bank. While the CPM modulator is common toall transmit antennas, the correction filter bank applies different correctionunits to each antenna. Thereby desirable code properties as orthogonality andfull diversity are achievable with just a slightly larger bandwidth demand.This new representation has three main advantages. First, it allows to easilygeneralize the orthogonality condition to any arbitrary number of transmitantennas. Second, for a quite general set of correction functions that wedetail, it can be proved that full diversity is achieved. Third, by separatingthe modulation and correction steps inside the receiver, a simpler receiver canbe designed as a bank of data independent inverse correction filters followedby a single CPM demodulator. Therefore, in this implementation, only onecorrelation filter bank for the detection of all transmitted signals isnecessary. The decoding effort grows only linearly with the number of transmitantennas.



Author: Matthias Hesse, Jerome Lebrun, Lutz Lampe UBC, Luc Deneire

Source: https://arxiv.org/







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