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The authors have been researching a 4×4 SVD-MIMO-OFDM system that adaptively changes transmitter weights and modulation schemes in accordance with feedback information received by a TDD. This report presents our evaluation of the effects of feedback delays due to the TDD on the BER performance of the proposed system. The computer simulation results revealed that the required normalized SNR of a system...
We are designing system parameters for manufacturing a prototype SVD-based 4×4 MIMO-OFDM system with our adaptive bit and power allocation (ABPA) algorithm. Designing the parameters at the cost of a minimum amount of feedback is important to achieve high spectral efficiency in time division duplex (TDD) systems. We constructed a performance evaluation system for the SVD-based MIMO system and evaluated...
Hybrid automatic repeat request (HARQ) can make efficient and reliable transmission possible for radio communications. However, in the HARQ scheme, packet control information (PCI), such as HARQ block identifiers (HARQ block ids) in selective repeat ARQ (SR-ARQ), are required and the reduction of PCI overhead is an issue. In particular, type-II HARQ handles a large amount of PCI because it includes...
We have been developing a new wireless link that enables quick transmission of file-based video resources for news programmes. Since the transmission distance we assume ranges widely from less than 1 km to as far as 50 km, it is necessary to have efficient transmission timing control in duplex communication based on TDD. In order to enhance the transmission capacity in line-of-sight environments,...
We have been developing a minimum-mean-square-error macrodiversity (MMSE-MD) reception system using distributed remote antennas and radio-on-fiber (RoF) links for use in live broadcasts of road races. The system selects remote antennas with good signal quality and combines their signals based on the MMSE algorithm to combat both small-scale and large-scale fading. For the system to be feasible, we...
Multiple-input multiple-output (MIMO) systems with antenna selection are practical ones that can intuitively alleviate the computational complexity at the receiver and achieve good reception performance. Channel correlation, not just carrier-to-noise ratio (CNR), has a great impact on the reception performance in MIMO channels. We propose a simple antenna selection algorithm that exploits the condition...
We have been developing a minimum mean square error macro-diversity (MMSE-MD) reception system using distributed remote antennas and radio-on-fiber (RoF) links for use in live broadcasts of road races. For the system to be feasible, we have to consider the propagation delay differences among diversity branches due to RoF links and radio propagation. This paper describes a hardware implementation of...
Iterative low-density parity-check (LDPC) coded multiple-input multiple-output (MIMO) systems are known to be able to theoretically achieve excellent performance by computer simulation. If the systems can exploit time interleaving long enough to cover a fading cycle, excellent error rate performance should be obtained in mobile line-of-sight (LOS) environments. This paper describes an iterative LDPC...
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