Discrete Load-Modulated Single-RF MIMO Transmitters

Konferenz: WSA 2016 - 20th International ITG Workshop on Smart Antennas
09.03.2016 - 11.03.2016 in München, Deutschland

Tagungsband: ITG-Fb. 261: WSA 2016

Seiten: 7Sprache: EnglischTyp: PDF

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Sedaghat, Mohammad A.; Fischer, Georg; Ali, Arslan (Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany)
Mueller, Ralf R. (Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany & Norwegian University of Science and Technology, Trondheim, Norway)

Some recent progresses in Load-Modulated Single- RF (LMSRF) multiple-antenna transmitters are presented including the circuit analysis in the case of closely spaced antennas. Mutual coupling effect is considered and it is shown that there is no need for any decoupling network since the mutual coupling effect can be considered in digital baseband domain. Furthermore, discrete LMSRF is introduced and an implementation method for it using PIN diodes and microstrip lines is presented. Some simulation results for Orthogonal Frequency Division Multiplexing (OFDM) signals with Quadrature Amplitude Modulation (QAM) and Quadrature Phase Shift Keying (QPSK) inputs are presented, e.g., it is shown that using 8 switches in every load modulator results in a signal to distortion ratio of 17.8dB at the transmitter.