Abstract
In this paper, a low-complexity multi-cell resource allocation algorithm with a near-optimal system throughput is proposed to resolve the conflict between the high system throughput and low complexity of indoor visible light communication ultra-dense networks (VLC-UDNs). First, by establishing the optimal model of the resource allocation problem in each cell, we concluded that the problem is a convex optimization problem. After this, the analytic formula of the normalized scaling factor of each terminal for resource allocation is derived after reasonable approximate treatment. The resource allocation algorithm is subsequently proposed. Finally, the complexity analysis shows that the proposed algorithm has polynomial complexity, which is lower than the classical optimal inter-point method. The simulation results show that the proposed method achieves a improvement of 57% in performance in terms of the average system throughput and improvement of 67% in performance in terms of the quality of service (QoS) guarantee against the required data rate proportion allocation (RDR-PA) method.
Highlights
Visible light communication (VLC) is an emerging wireless communication technology, which simultaneously achieves communication and illumination [1,2] and has the advantage of high speeds [3]
The reference values for the three characters in VLC-ultra-dense networks (UDNs) are provided as follows [7]: the terminal density is higher than 0.25 terminals per m2 ; the traffic density is higher than 10 Mbps/m2 ; and the distance between the access point (AP) is less than 10 m
∑ xi ≤ 1 i =1 where x = { x1, · · ·, xi, · · ·, x N }; xi is a certain optimization variable and represents the normalized resource ratio factor that the AP allocates to the i-th terminal; N is the general representation of the number of associated terminals in the cell; B is the total bandwidth resource of the cell; Si is the useful signal of the i-th terminal; Ii is the interfering signal at the i-th terminal; and n0 Bxi is the noise of the i-th terminal
Summary
Visible light communication (VLC) is an emerging wireless communication technology, which simultaneously achieves communication and illumination [1,2] and has the advantage of high speeds [3]. Reference [10,11,12,13] improved the system performance, the algorithm design deviates from the actual spatial scene of VLC-UDNs. References [14,15] allocated resources based on the priority of terminals, which was measured using the fuzzy logic (FL) theory. There is the need to design an efficient resource allocation algorithm with optimal throughput and low complexity. Compared with the classical optimal inter-point method, the proposed algorithm has similar throughput performance and quality of service (QoS) guarantee while reducing the complexity. In the comparisons of system throughput, the proposed algorithm achieves an improvement of 57% in performance compared to the conventional RDR-PA method and the uniform allocation method [21,22].
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