Limited Rate Feedback Scheme for Resource Allocation in Secure Relay-Assisted OFDMA Networks

作者：Abedi Mohammad Reza^*; Mokari Nader; Javan Mohammad Reza; Yanikomeroglu Halim

来源：IEEE Transactions on Wireless Communications, 2016, 15(4): 2604-2618.

DOI：10.1109/TWC.2015.2505728

• Physical (PHY) layer security
• limited feedback
• eavesdropper
• decode-and-forward (DF) relay

In this paper, we consider the problem of resource allocation for secure communications in decode-and-forward (DF) relay-assisted orthogonal frequency-division multiple access (OFDMA) networks. In our setting, users want to securely communicate to the base station (BS) with the help of a set of relay stations (RSs) in the presence of multiple eavesdroppers. We assume that all channel state information (CSI) of the legitimate links and only the channel distribution information (CDI) of the eavesdropper links are available. We formulate our problem as an optimization problem whose objective is to maximize the sum secrecy rate of the system subject to individual transmit power constraint for each user and RS. As a first work which considers limited feedback schemes for secure communications in cooperative OFDMA networks, we consider the limited-rate feedback case, where in addition to transmit power and subcarrier assignments, channel quantization should be performed and boundary regions of channels should be computed. We further consider the noisy feedback channel. We solve our problem using the dual Lagrange approach and propose an iterative algorithm whose convergence is analyzed. Using simulations, we evaluate the performance of the proposed scheme in numerous situations.

• 出版日期2016-4