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Noise immunity of methods in case of BPSK, MIMO 2x1 and F_D = 0

Space-frequency block coding with two-mode index modulation OFDM and increased stability to channel frequency selectivity

Viacheslav I. Solodovnyk, Mykola I. Naumenko


It is considered a technique of mutual application of multi-antenna MIMO systems and multiplexing with orthogonal frequency division of OFDM channels for current-technology systems of wireless communication of special application. There are defined areas of prior application of time and frequency variant of diverse signals transmission according Alamouti principle for wireless channels with limited frequency and energy resources. It is shown that application of fixed precoding matrix of Walsh–Hadamard to outgoing symbols of space-frequency Alamouti coder allows to increase stability of SFBC-OFDM method to frequency selectivity of a channel without system complication. It is analyzed a conception of index modulation of OFDM-IM subcarriers. There are demonstrated advantages of Dual-Mode OFDM-IM with optimized signals ensembles on a basis of BPSK, QPSK and 16-QAM. It is proposed a novel signal-code construction (SCC) with join of dual-mode index modulation of OFDM subcarriers, orthogonal space-frequency block coding with Alamouti kernel and Walsh–Hadamard coder WH-SFBC-DM-OFDM-IM. Such method in contrast to classic SFBC-OFDM method allows to increase simultaneously spectral and energy efficiency of information transmission systems in conditions of frequency-time selectivity of communication channel. Proposed method is completely invariant to frequency selectivity in case of BPSK application and partially invariant in case of application of QPSK and 16-QAM. The simulation results show that noise immunity of such SCC is enough better in compare with the other methods due to providing of identity of space-frequency word at duration of OFDM symbol. The method is advisable to use for provision of high-quality communication with high-dynamic ground objects, pilotless vehicle and the other aircrafts in conditions of critical decrease of channel noise prtection which appears in case of influence of radio countermeasures systems.


MIMO; SFBC; OFDM; index modulation; dual-mode; frequency selectivity; non-stationerity

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