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Recently, we proposed a multi-block frequency-domain equalization (MB-FDE) for single-carrier space-time block coded time-division duplex (SC-STBC TDD) transmission. In this paper, we propose an adaptive two-dimension (2D) multi-input multi-output (MIMO) channel estimation (CE) for SC-STBC TDD transmission in a high mobility environment. In the proposed adaptive 2D-MIMO-CE, the channel over consecutive...
In this paper we propose new schemes for increasing code rate of simple cooperative relaying with virtual orthogonal space time block coding (OSTBC). The proposed schemes are used for creating virtual 4×1 multiple input-single output channel (MISO). These systems include one base station (BS) with two antennas, two relay stations (RS) each with a single antenna and one mobile station (MS) with a single...
In this paper, we propose a space-time block coded (STBC) amplify-and-forward cooperative (STBC-Co-AF) relay which requires no knowledge of CSI at relay station (RS). In STBC-Co-AF relay, the source node transmits 2-block signal to both RS and the destination node in the first time slot and then, RS transmits amplified STBC-coded signal to the destination node in the second time slot. The destination...
Although the joint source and channel coding (JSCC) system based on double protograph low-density parity-check (DP-LDPC) codes shows excellent error performance in wireless communications systems, there still is some space left for the improvement of error rate performance and the robustness of this JSCC system as it suffers high sensitivity to source statistics. In this paper, an adaptive rate allocation...
In 2013, Japan launched for practical use of the world's first VHF-band broadband wireless communication system for “Public Protection and Disaster Relief (PPDR)”. NICT has been promoting research and development (R&D) and standardization regarding this new wireless system or public broadband (PBB) wireless communication system. This paper presents the outline of this system and the current status...
Small cell networks enhance spectrum efficiency by handling the indoor traffic of mobile networks on a frequency-reuse operation. Because most of the current mobile traffic happens indoor, we introduce a prioritization shift by imposing a limitation on the outage generated by the outdoor mobile system to the indoor small cells. In this paper, we consider downlink spectrum sharing between a system...
In this paper we propose a new solution for improving BER performance of the virtual quasi orthogonal space time block coding (QOSTBC). The proposed scheme is compared with virtual QOSTBC and virtual orthogonal space time block coding (OSTBC) schemes. The considered schemes are used for creating virtual 4x1 multiple input-single output (MISO) channel. These schemes include one base station (BS), one...
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