Coordinated Multi-point (CoMP) transmission and reception is considered as a promising technique to combat inter-cell interference, enhance throughput, improve mobility, reduce handover interruption time, and also to increase spectrum efficiency. In this paper, we investigate and analyze the performance of uplink intra-site joint reception CoMP (JR-CoMP) for LTE-Advanced (LTE-A) systems. Both single user-MIMO (SU-MIMO) CoMP and […]
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Performance of uplink joint reception CoMP with antenna selection for reducing complexity in LTE-A systems
Long Term Evolution Advanced (LTE-A) Release 12 allows direct communication among User Equipments (UEs). This is called Proximity Services (ProSe) or Device-to-Device (D2D) communication providing increased spectral efficiency and lower packet latency. As a drawback, interference aware scheduling for D2D communication is even more challenging than for a reuse-1LTE-A scenario. In this paper we formulate […]
Read moreThe Sleeping Cell problem is a particular type of cell degradation in Long-Term Evolution (LTE) networks. In practice such cell outage leads to the lack of network service and sometimes it can be revealed only after multiple user complains by an operator. In this study a cell becomes sleeping because of a Random Access Channel […]
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Coordinated voltage control in distribution grids with LTE based communication infrastructure
In modern distribution grids voltage problems are likely to be more common and more significant, due to the high penetration of Distributed Generation (DG) that can vary their in-feed in short times. Coordinating these DGs, either in a centralized or distributed fashion, to maintain voltage at prescribed limits may be one effective solution. However, this […]
Read moreThe wide flexibility of LTE resource allocation scheme has led to the definition of various schedulers that attempt to maximize the quality of the service offered to the different users, depending on their channel conditions. Unfortunately, providing service guarantees in dynamic channel conditions typically requires a cost in terms of spectral efficiency of the transmission resource allocation. […]
Read moreWe analyze Coordinated Multi-Point (CoMP) transmission and reception over heterogeneous wireless networks (HetNets). Our focus is on the design of a practical algorithm for joint resource allocation (joint scheduling) in each HetNet cluster. We present one such algorithm together with its detailed analysis and evaluation under two different approaches for obtaining and utilizing channel feedback […]
Read moreOne of the key elements of radio resource management in mobile networks is MAC (Media Access Control) scheduling. The scheduling algorithms play a role in overall network performance and are not specified in the Long Term Evolution (LTE) standards. This paper describes how to assess the performance of a scheduler implementation by designing an adaptive […]
Read moreLTE-Advanced networks employ random access based on preambles transmitted according to multi-channel slotted Aloha principles. The random access is controlled through a limit W on the number of transmission attempts and a timeout period for uniform backoff after a collision. We model the LTE-Advanced random access system by formulating the equilibrium condition for the ratio of […]
Read moreA 2.6 GHz cascode CMOS power amplifier with the derivative superposition (DS) method and the second harmonic control for LTE application is fabricated in TSMC 1P6M 0.18 μm standard CMOS process. The DS method uses two transistors connected in parallel and biased in low and high inversions to compensate for the gm3 and achieves the greater third-order intercept […]
Read moreThe roof of an automobile would appear to be an ideal platform to place multiple-input-multiple-output (MIMO) antennas, having a large ground plane with plenty of space to separate antennas for optimum embedded element radiation efficiency. However, styling concerns often require that the antennas are to be placed close together. Thus, mutual coupling plays an important […]
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