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In this paper, we present an efficient distributed differential quasi-orthogonal space-time block code (DD-QOSTBC) system for multiple relay networks. First, we propose the DD-QOSTBC transmission which considers two robust STBC-like subsystems in amplify-and-forward multiple relaying over flat fading channel. It is assumed that source has two antennas, and relays and destination have a single antenna. With robust STBC-like subsystem structure, we show that our robust subsystems can be used for an efficient joint suboptimal differential decoding based on a maximum likelihood criterion. Finally, we accomplish the performance evaluation on the proposed DD-QOSTBC system in terms of bit-error-rate.

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In this paper, we present a Polarization Division Multiplexing (PDM)-Vestigial Sideband (VSB) transmission technique for advanced terrestrial broadcasting systems. The PDM-VSB transmission combines a PDM composing of polarization states and rotation matrices, and VSB filtering in order to improve both spectral efficiency and reception performance of advanced television systems committee (ATSC)-VSB system. In the corresponding PDM-VSB reception, we present the baseband de-multiplexing schemes and then evaluate the channel capacity and symbol error rate of PDM-VSB system by comparing with those of ATSC-VSB system in the Ricean fading channels. Here, the channel models include channel impairment parameters such as Ricean factor, transmit and receive correlations, crosspolarization discrimination (XPD), and antenna coupling effects.