Abstract
In this paper, we investigate the resource allocation for multi-user orthogonal frequency division multiple access (OFDMA) power line communication (PLC) systems, which satisfy both the total average transmit power constrained by PLC networks and the required interference limitations. First, we propose an optimal resource allocation scheme, with respect to joint consideration of the subcarrier and power constraint to maximize the throughput of the PLC system. Then, we divide the intractable problem into two individual subproblems to decrease the computational burden, which can avoid proceeding the mixed integer nonlinear programming (MINLP) problem. The proposed resource allocation scheme can ensure the optimality and efficiency of the system with rigorous proofs. The simulation results show that our proposed resource allocation scheme for the PLC system outperforms other algorithms, and is efficient with acceptable complexity.
Highlights
The orthogonal frequency division multiplexing (OFDM) combined with dynamic resource allocation technology can dynamically allocate the subcarriers to every user and allocate the transmit power on each subcarrier according to the channel state
System is shown in Figure 1, we can see that the base station (BS) of the communication network is connected to the Internet through the access point, and the BS is connected to the power grid by the coupling circuit on the low voltage side of the power transformer
This paper focuses on the relay-based multi-user power line communication (PLC) downlink system, which can satisfy the total power constraint and the interference limitations required by the users
Summary
The orthogonal frequency division multiplexing (OFDM) combined with dynamic resource allocation technology can dynamically allocate the subcarriers to every user and allocate the transmit power on each subcarrier according to the channel state. In [15], the energy-saving user scheduling and power control in downlink multicell multiuser orthogonal frequency division multiple access (OFDMA) networks is investigated only with the channel distribution information, which can solve the resource allocation problem subject to the minimum throughput constraint of each user, even if the channel gain is the same for all the subcarriers. The specific contents of this paper are as follows: Firstly, for the case of power constraints of the transmission source or relay, the problem description of maximizing the throughput of the system under the constraints of average power is given; secondly, for the case of multi-user OFDMA, The method of separating subcarrier and power allocation is used to give the optimal resource allocation strategy under the average power constraint and the interference power constraint. Gaussian distribution with the mean being 0 and the variance being σ2 . [·]T denotes the matrix transpose. [ x ]+ denotes max{ x, 0}. diag{z1 , z2 , . . . , z M } denotes a diagonal matrix with the diagonal entries from z1 , z2 , . . . , z M . | · | denotes the absolute value of a real number or a modulus of a complex number. 52 f (·) denotes the Hessian matrix of f (·)
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