Co-located and distributed multicarrier space-time shift keying for wideband channels

Abstract

Multicarrier (MC) transmissions are proposed for the space time shift keying (STSK) concept. Specifically, OFDM, MC CDMA and OFDMA/SC-FDMA-aided STSK are proposed for transmissions over dispersive wireless channels. Additionally, a successive relaying (SR) aided cooperative MC STSK scheme is conceived for gleaning cooperative space time diversity and for mitigating the half-duplex throughput loss of conventional relaying. Furthermore, a multiple-symbol differential sphere decoding (MSDSD) aided multicarrier STSK arrangement is proposed to dispense with channel estimation (CE).

We design a novel modality of realizing STSK amalgamated with OFDM for facilitating high-rate data-transmissions through a number of low-rate parallel subchannels, thus overcoming the dispersion induced by broadband channels. A MC-CDMA aided STSK system is also proposed for mitigating the channel-induced dispersion, while providing additional frequency-domain (FD) diversity and supporting multiuser transmissions. As a further advance, we design OFDMA and SC FDMA-aided STSK systems, which are capable of communicating in dispersive multiuser scenarios, whilst maintaining a low peak-to-average power ratio (PAPR) in the SC-FDMA-aided STSK uplink. Additionally, complexity reduction techniques are proposed for OFDMA/SC-FDMA-aided STSK.

We also conceive the concept of SR aided cooperative multicarrier STSK for frequency-selective channels for mitigating the typical 50% throughput loss of conventional half-duplex relaying in the context of MC-CDMA and for reducing the SR-induced interferences. We additionally propose a differentially encoded cooperative MC-CDMA STSK scheme for facilitating communications over hostile dispersive channels without requiring CE.

Finally, the noncoherent multicarrier STSK arrangement is further developed by using MSDSD. The conventional differential detection suffers from a typical 3-dB performance loss, which is further aggravated in the presence of high Doppler frequencies. Hence, for the sake of mitigating this performance loss in the face of high Doppler scenarios, while maintaining a modest decoding complexity, both a hard-decision-based as well as an iterative soft-decision multiple-symbol differential sphere decoding aided multicarrier STSK arrangement is developed.

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Identifiers

ORCID for L. Hanzo: orcid.org/0000-0002-2636-5214

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