Multiplexing precoding scheme for STC-CPM with parametric phase discriminator IWM receiver

TitleMultiplexing precoding scheme for STC-CPM with parametric phase discriminator IWM receiver
Publication TypeConference Paper
Year of Publication2008
AuthorsSykora, J., and R. Schober
Conference NamePersonal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on
Pagination1 -6
Date Publishedsep.
Keywordsantenna arrays, constant envelope continuous phase modulation class, continuous phase modulation, curved space, information theoretic analysis, information waveform manifold, isomorphism decoding, MIMO channels, MIMO communication, multiantenna transmitters, multichannel modulations, multifrequency antennas, multiple-input multiple-output channels, multiplexing capabilities, multiplexing precoding scheme, mutual information regions, nonlinear preprocessor, nonlinear projector, outer space-time coding, parametric phase discriminator IWM receiver, perfect ambiguity resolution, precoding, receive antenna, receiving antennas, space division multiplexing, space-time codes, STC-CPM, transmit spatial-differential precoding scheme, transmitting antennas, two parallel channels

A constant envelope continuous phase modulation (CPM) class of Multi-Channel (MC) modulations for multi-antenna transmitters is considered. Each receive antenna receives a superposition of CPM waveforms. The useful signal at the receiver spans a curved space - the information waveform manifold (IWM). Particularly it has the form of a cylinder on a cylinder for 2-component CPM signals. At the receiver, we use a nonlinear preprocessor consisting of a nonlinear projector on the IWM, optional processing on the curved space, and a decoding isomorphism. A particular form of the preprocessor, the 2-component IWM phase discriminator, is analyzed. We show that the discriminator can separate individual instantaneous phases of the component CPM modulations and therefore has multiplexing capabilities with respect to the individual transmitted components. Two parallel channels are created without the need for a time domain processing since the procedure fully relies on the curved space properties of the IWM, and thus can be combined with arbitrary outer space-time coding of MC-CPM. An information theoretic analysis of the multiplexing properties based on the mutual information regions is presented. The discriminator solution has a two-fold ambiguity. We show that the discriminator provides good separation of component phases conditioned on a perfect ambiguity resolution. We propose a transmit spatial-differential precoding scheme that allows the ambiguity resolution.


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