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One open problem for wireless communication in the high-speed railway environment is channel capacity. In this paper, we study the problem of ergodic capacity for the time-selective and frequency-selective wireless channels in the high-speed railway environment. Firstly, we build up the channel model for the wireless communication between mobile users on the high-speed train and the base station along...
MIMO (Multiple-Input-Multiple-Output) is a promising structure for wireless communication. While virtual MIMO structure has been proposed for distributed and cooperative wireless networks, this proposed structure has also put additional energy consumption where energy stands in the important position. At the same time, we have observed that this-problem-caused low energy nodes' mibehavior will degrade...
The conventional cooperative protocols have to face some problems in practical broadcast and multicast systems because feedback channel is unavailable. An adaptive cooperative relay protocol, which can be adopted in future broadcast systems, is proposed in this paper. The outage probability performance of this protocol is analyzed over Nakagami-m fading channel, and the asymptotic expression of outage...
In the conventional multicast transmission scheme the multicast signals are transmitted to a single multicast group in one multicast service and the system capacity is restricted by the worst channel user. We proposed a novel time-division multicast transmission scheme using multiple multicast groups. In this scheme, the signals are transmitted to the inner multicast group within a boundary distance...
We propose a forwarding scheme by superposition coding for wireless relaying, in which a relay will not forward a message to a destination if the destination has successfully decoded the message directly from a source. In our scheme, flag signal and data signal are superimposed and transmitted by the source, and according to whether the flag signal has been successfully decoded by the relay, the relay...
DSTBC (differential space-time block coding) system does not require CSI (channel state information) in both transmitter and receiver sides, but its SNR (signal to noise ratio) versus BER (bit error rate) characteristic is degraded compared with original STBC scheme which utilizes CSI at the receiver. In this paper, attempting to recover this performance loss originated from the differential decoding,...
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