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In wireless powered communication networks (WPCNs), each user node, e.g., wireless powered sensor, is capable of either harvesting energy from a power station or transmitting data to a sink node. In the previous works, time division multiple access (TDMA) is typically used for transmission scheduling in WPCNs, that is, only one node can transmit data in one time slot. The spectrum efficiency is therefore...
Cloud radio access network (C-RAN) is a new concept of network architecture, which brings a technical revolution into the wireless communication market and leads to some kind of all new mode of the future wireless communications. In this paper the clustering algorithm based on multi-objective optimization is investigated. The proposed algorithm aims at maximizing the throughput contribution of the...
Coordinated multi-point (CoMP) transmission can significantly improve the spectral efficiency of cellular networks. To reduce the training overhead and the complexity for implementing CoMP, an effective way is to divide base stations (BSs) into cooperative clusters. However, with disjointed clusters, the cluster-edge users suffer from inter-cluster interference. In this paper, a scheme is designed...
In 3GPP LTE-Advanced, relaying is considered as an important means for extending cell coverage and improving capacity. However relays create new cell edge and generate more interference. With the introduction of relay, interference management or coordination is needed. In this paper, we propose a simple yet effective inter-cell interference coordination scheme for an inband relaying system based on...
In this paper, we propose and evaluate a novel resource allocation scheme in C-RAN TDD by means of dynamic BBU-RRU mapping. Specifically, in our proposed scheme, the logical connections between BBUs and RRUs are dynamically adjusted according to the asymmetric DL/UL resource allocation and traffic condition. In addition, since the asynchronous DL/UL allocation results in significant cross-subframe...
In 3GPP LTE-Advanced, relay is considered as an important means for extending cell coverage and improving capacity. Backhaul resource allocation needs to be carefully designed to achieve the performance advantage of relay. In this paper, we propose a two-step backhaul resource allocation scheme for an inband relaying system based on relay buffer level. The resource assignment to relays meets the actual...
Opportunistic Network Coding (ONC) has attracted much attention recently. The main improvement of ONC over the traditional network coding is that ONC allows the encoding node to decide whether it employs network coding based on the status of all its input streams. However, due to the nature of fading, wireless links may not always be reliable. Thus, the performance gain of ONC over traditional methods...
Bidirectional Forwarding Detection (BFD) is introduced into node failure or link failure detection for OBS networks. And a BFD-triggered failure detection mechanism combines with Fast Reroute (FRR) is proposed and simulated. Simulation results verify the feasibility and effectiveness of the proposed mechanism.
This paper proposes the employment of trelliscoded-modulation (TCM) to improve error performance and/or to increase system throughput in a multi-gigabit physical layer (PHY) design for millimeter-wave 60 GHz wireless personal area network (WPAN) systems. Hardware impairments such as the 60 GHz power amplifier (PA) non-linear distortion and the 60 GHz phase-locked loop (PLL) phase noise (PN) are considered...
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