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This paper investigates the ergodic secrecy capacity (ESC) of multiple-antenna amplify-and-forward relay systems, where one eavesdropper can wiretap the relay. To reveal the capability of the multiple- antenna relay in improving the secrecy performance, we derive new tight closed-form lower bounds of the ESC for two secure transmission schemes: artificial noise aided precoding (ANP) and eigen-beamforming...
The increase of antennas can greatly improve the performance of MIMO systems, in the meanwhile, the precise channel state information is difficult to obtain since the channel matrix of massive MIMO is much more complex than the traditional one. In this paper, we propose a limited feedback strategy named hybrid limited feedback with selective eigenvalue information (HLFSEI), which jointly considers...
This paper considers the problem of adjacent channel interference between two different operators using different duplexing methods. Focusing on the interference between two co-located base stations, which existing guard-band based methods still cannot solve efficiently, we propose a scheme that adjusts the downlink power of the aggressor system to maximize the downlink transmission capacity while...
This paper proposes a joint relay selection and power allocation scheme for bidirectional asymmetric traffic to minimize the weighted energy consumed per bit transmitted. The scheme can be applied to both one-way and two-way Amplify-and-Forward (AF) relay networks. In the scheme, close-form solutions for energy efficient power allocation are derived with perfect channel state information at each relay...
This paper investigates the one-side interference channel with relay under the exponential power allocation. Usually, the transmitted power linear scaling with the maximum power is used. In this paper, an exponential power allocation is proposed, in which, the transmitted power of each node is presented by an exponential function of the maximum transmitted power with a coefficient. With the exponential...
The approximate minimum average symbol error rate (SER) precoder is designed for spatial multiplexing (SM) system in Ricean channels. Based on long-term channel state information (CSI), a closed-form solution that combines eigen-beamforming (E-BF) and power allocation is presented for correlated Ricean channel. Moreover, a simple precoder only based on K-factor and line-of-sight (LOS) departure angle...
This letter considers the problem of resource sharing between two selfish nodes in cooperative relay networks. In our system, each node can act as a source as well as a potential relay, and both nodes are willing to achieve an optimal signal-to-noise ratio (SNR) increase by adjusting their power levels for cooperative relaying. We formulate this problem as a two-person bargaining game, and use the...
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