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This paper proposes an improved interference sub-space alignment scheme for the K-user interference channels, which combines the conventional interference subspace alignment algorithm and the power allocation algorithm between data streams. More specifically, in the proposed scheme a power allocation scheme is developed to mitigate the leftover interference from the conventional interference subspace...
The performance of cooperative communications highly depends on careful resource management, such as power allocation and relay selection. Great deal of works has been done in this field in the past few years. However, the power allocation and relay selection of opportunistic cooperative system without direct-link between source and the destination have not been extensively studied. In this paper,...
An adaptive subcarriers nulling power allocation algorithm for OFDM-based cognitive radio (CR) network was proposed to maximize the total capacity of CR users, with constraints on sum transmit power and the interference introduced to individual primary user on its allocated frequency band. The proposed algorithm considering both CR users' channel states and the interference to primary users (PUs)...
In this paper, we develop a distributed power control scheme for relay channels with confidential message in an uplink OFDMA-relay cellular by Amplify-and-Forward mode. We introduce a two-stage game in a progressive optimization. In this scenario, the relay is considered not only as a sender that assists the information transmission, but also as an eavesdropper who can wiretap information. In the...
The situation where the same signal has to be sent to a number of wireless receivers arises more and more often, due to the increasing use of wireless internet including TV. Classically, this is done either by establishing several one to one communications, which is obviously a waste of resources, or by establishing a broadcast service, addressing potentially all users of a given area. However, the...
In this paper, an improved minimum total path loss (MTP) method combining with power allocation is proposed for the relay node selection. Single-relay assisted single-carrier frequency-division multiple-access (SC-FDMA) for uplink transmissions is characterized. For the sake of exploiting the benefits of the proposed method, we investigate both the direct transmission as well as the traditional MTP...
Coordinated Multi-Point (CoMP) transmission or reception is an efficient way to reduce inter-cell interference, improve the spectrum efficiency and coverage in LTE-Advanced systems. Compared with other CoMP technologies, Joint Transmission (JT), which carries out precoding based on the channel information, can achieve better system performance gain. In this paper, a scheme termed the projection-based...
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