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Relaying techniques can extend the communication range and coverage, and reduce the transmission power required to reach the users far from the base station. These benefits make MIMO relaying techniques a powerful candidate for implementation in the next generation of wireless networks. The conventional non-regenerative approach is the amplify and forward(More)
The concept of cooperative diversity promises to offer the benefits of spatial diversity gains to handheld wireless devices with single antennas. So far the research has focused on special modulation or space-time coding in order to allow the cooperating terminals transmit simultaneously during the relay phase. In this paper, we proposed a joint relay(More)
In the visible light communication (VLC) system, the discrete multitone modulation (DMT) is one of the alternative efficient modulation schemes and the bit-power distribution among related carriers is crucial to the final channel capacity. In the paper, the channel capacity in Krongold algorithm is compared with the upper bound and the lower bound. The(More)
This paper refers to some closed two-stage queueing systems with state-dcpendent vacation policy. By means of the markovian rcnewal process and the stochastic decomposition formulas of the quantities in equilibrium for M/Gjl vacation models, we derive both stationary distributions of the queue length and the cyclic time for the closed state-dependcnt(More)
The concepts of cooperative diversity promise to offer the benefits of spatial diversity gains to handheld wireless devices with single antennas. So far the research has focused on the situation where perfect channel state information is available and coherent detection is employed at the destination receiver. This paper proposes a differential(More)
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