Shixiang Shao

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Future cellular networks such as IMT-Advanced are expected to allow Device-to-Device (D2D) communication as an underlay. During the downlink period, both of the D2D receiver and cellular user will suffer from interference caused by radio resource sharing. In this paper, a joint resource allocation and resource reuse scheme is investigated, in which resource(More)
Device-to-Device (D2D) communication underlaying cellular network is a promising technique of local service to improve the system capacity and spectral efficiency. While, large amount of interference can be caused by sharing the resources between the cellular users and D2D pairs, so an optimal resource allocation method is necessary to coordinate the(More)
This paper studies the outage probability of device-to-device (D2D) communication aided by another D2D user using the two-way amplify-and-forward (AF) relaying protocol. We first discuss the outage behavior under strong and weak interference from the cellular network. Then the exact expressions for the outage probability under the two cases are derived.(More)
A new power control algorithm is proposed in a cognitive radio system with MC-CDMA. A new uility function that is formed by transmit power and SIR is applied to the algorithm and the static nash equilibrium is obtained for uility function. The nash equilibrium power in new algorithm provides substantial power saving as compared to SIR balancing algorithm(More)
A unified system model for multirate multiple-input multiple-output (MIMO) multicarrier code division multiple access (MC-CDMA) systems is proposed in this paper. Based on the proposed unified system model, a novel space-frequency minimum mean-squared error based successive interference cancellation receiver (SF-MMSE/SIC) is developed and analyzed. The(More)
In this paper, we investigate the outage probability of device-to-device (D2D) communication assisted by decode-and-forward (DF) relay node and that using traditional strategy. We assume all terminals are equipped with single-antenna. We first derive closed-form expressions for the outage probability of the D2D link under asymmetrical and symmetrical cases(More)
In this paper the problem of power control in cognitive radio system is approached from the perspective of non-cooperative game theory, and an algorithm is presented. A new utility function for mobile terminals is defined, and a detailed analysis of the existence and uniqueness of Nash equilibrium for the utility function. A effective sigmoid efficiency(More)
An improved minimum mean square error (MMSE) channel method with low complexity is proposed for the massive multiple input multiple output (MIMO) system. In the method, the covariance matrix in the MMSE method is firstly approximately estimated by the received signal, where the optimal approximated weight is given, and then the Sherman-Morrison theorem is(More)
Considering the effect of the transmitting data, this paper analyzes the performance of circular SA with 8 array elements (AE) in different application scenarios. Double codechannels pointing to the same direction is the basic mode of TDDCDMA when transmitting voice signals. However, our research has discovered that the system working in that mode is(More)