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A novel quantize-and-forward scheme with two relays is proposed in this paper. In our scheme, each relay only processes one bit of the quantized codeword. The principle of selecting the aforementioned bit is based on the channel condition of the relay links. Compared with the single-relay scheme, the system consumes the same resources, while each relay has a prolonged life since it only transmits...
It is well known that broadband wireless communications (BWC) are necessary for high speed vehicles since passengers need many broadband wireless multimedia services. However, one design challenge is to identify sufficient spectrum resource to support BWC in high speed vehicles. Recently, cognitive radios (CRs) are being considered as a promising technology to solve scarcity problem of spectrum resource...
The femtocell network is regarded as an effective approach to provide better services for indoor users with higher capacity. However, the spectrum allocation problem of the femtocell network is challenging for the wireless operator, since the added femtocell tier either requires additional spectrum resource or brings interference to the existing cellular network. In this paper, we consider the methods...
In this paper, we propose a novel scheme to improve the throughput of femtocell networks. The proposed scheme consists of two steps: spectrum allocation for femtocells and dealing with nearby macro-users with access control strategy. Since the positions of femtocells are relatively stable, we firstly deal with inter-femtocell interference and formulate it as an integer programming problem. Then we...
Recently, cognitive radio has become a hot spot, in which secondary users could use the frequency bands when primary users are absent. Hence, the detection of primary users' presence plays an important role in cognitive radio networks. In this paper, a cognitive radio network with multiple licensed users is considered. Secondary users cooperatively detect the presence of primary users using energy...
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