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In this paper, we address the problem of joint Resource Block (RB) allocation and Modulation-and-Coding Scheme (MCS) selection for LTE femtocell DownLink (DL). We first formulate the problem as an Integer Linear Program (ILP) whose objective is to minimize the number of allocated RBs of a closed femtocell, while guaranteeing minimum throughput for each user. In view of the NP-hardness of the ILP,...
This paper presents a multi-path delay commutator (MDC) FFT processor for high-speed. The proposed FFT processor can achieve a high throughput by using a parallel datapath scheme and a multi-path delay commutator structure. The proposed processor can provide a low hardware complexity and an efficient scheduling scheme of complex multiplications. The proposed efficient scheduling scheme can reduce...
In this paper, we have extended the GeoDivRP geodiverse routing protocol to consider jitter requirements when using multiple geographic paths for telecommunication networks under regional challenges. We have formulated bounded-jitter multipath routing using a multi-commodity flow problem and proposed an integer linear programming formulation to solve it. We have implemented the routing protocol in...
In this paper, we consider a full duplexing (FD) wireless cellular network where a central base station (BS) works in the FD mode while the downlink (DL) and uplink (UL) users work in the time division duplexing (TDD) mode. Since this FD system induces the inter-user interference from UL user to DL user, the main challenge for maximizing the system performances is user pairing that makes a pair of...
This paper introduces the Cloud-based Radio Access Network (C-RAN) architecture into heterogeneous network (HetNet), in which distributed antennas are connected to a cloud-based baseband processing unit through optical fibers. Among various opportunities realized by this architecture, our focus in this paper is on the spectral efficiency (SE) advantages achieved by cooperative transmission and its...
This paper brings to light the reasoning and principles shaping the standardization direction in the 3rd Generation Partnership Project (3GPP) regarding provision of low complexity Machine Type Communication (MTC), via Long Term Evolution (LTE) of 3GPP. It elaborates 3GPP's approaches and suggestions towards addressing the physical layer challenges and discusses solutions 3GPP proposed specifically...
Development in VLSI design allows multi-to many-cores to be integrated on a single microprocessor chip. This increase in the core count per chip makes it more critical to design an efficient memory sub-system especially the Last Level Cache (LLC). The efficient utilization of the LLC is a dominant factor to achieve the best microprocessor throughput due to the increasing gap between processor speed...
Polar codes are a class of codes discovered recently, which are proved to have capacity-achieving performance. The hardware implementations of successive cancellation (SC) decoding and List SC decoding are increasing dramatically now. However, throughput of these hardware structures remain to be improved on the one hand. On the other hand, stochastic computation is now wildly used because it uses...
Coordinated multiple point transmission (CoMP) technology becomes popular due to its potential for improving the performance of cell-edge UEs who undergo strong inter-cell interference (ICI). To fully exploit the potential CoMP gain, the appropriate method to converge cells into cluster is a prerequisite. However, the majority of existing research are based on theoretical hexagonal cell grid model...
In this paper, Fulcrum network codes are introduced as a viable solution to cope with the heterogeneity of 5G communication and storage systems. Fulcrum network codes are an enhancement of random linear network codes (RLNC) offering high throughput performance at low overhead. This contrasts with state of the art solutions that only offer a trade-off between performance and overhead. Additionally,...
This paper presents an I/Q imbalance compensator which can support the throughput rate of 3.52 GSps and improve the signal-to-interference ratio (SIR) from 10.1 dB to 33 dB for a 60-GHz communication system in the IEEE 802.11ad standard. The equivariant adaptive separation via independence (EASI) algorithm is adopted. This blind-source separation (BSS) approach requires no prior information and demands...
The Turbo-decoding Message-passing (TDMP) algorithm of Low-Density Parity-Check (LDPC) codes has a faster convergence speed, lower hardware implementation complexity, and less storage units than the Belief-Passing (BP) algorithms. However, because of the integer quantization operations for initial information, restriction of storage units will cause the problem of decoding information overflowing...
In the field of production scheduling, this paper addresses the problem of maximizing the production horizon of a heterogeneous platform composed of identical parallel machines and which has to provide a given production service. Each machine is supposed to be able to provide several throughputs corresponding to different operating conditions. The key point is to select the appropriate profile for...
The directional 60GHz mmWave WPAN system can support concurrent transmissions owing to reduced interference among links. In this paper, a simple but effective STDMA scheduling scheme based on IEEE 802.11ad is proposed. In order to take user fairness into account in the concurrent link scheduling, an adjustment factor is first introduced, and a link scheduling scheme with low complexity is designed...
The imminent limitations imposed by the utilizationwall phenomenon compel architects to introduce heterogeneity in on-chip systems. The existing approaches to system-level synthesis of chip multiprocessors (CMPs) typically ignore physical aspects, leading to degradation in efficiency during later design stages. In this work, we propose and study the concept of patterned heterogeneous CMPs to handle...
Network engineers and designers need additional tools to generate network traffic in order to test and evaluate, for instance, application performances or network provisioning. In such a context, traffic characteristics are the most important part of the work. Indeed, it is quite easy to generate traffic, but it is more difficult to produce traffic which can exhibit real characteristics such as the...
Realization and implementation of a class of two-dimensional (2-D) separable-in-denominator recursive digital (SDRD) filters are discussed in this paper. First, we present five modular structures of 2-D SDRD filters which possess a high degree of modularity, parallelism and regularity in their building blocks for easy hardware and software implementation. Second, we analyze the performance of each...
This paper describes a hardware efficient linear precoder for Massive MIMO Base Stations (BSs) comprising a very large number of antennas, say, in the order of 100s, serving multiple users simultaneously. To avoid hardware demanding direct matrix inversions required for the Zero-Forcing (ZF) precoder, we use low complexity Neumann series based approximations. Furthermore, we propose a method to speed-up...
In relay assisted wireless communications, the multi-source, single relay and single destination system (an M-1-1 system) has garnered significant interest, due to the increased demand for higher network throughput and connectivity. Previously, power allocation at the relay in M-1-1 systems have assumed availability of instantaneous channel state information (CSI), which is rather idealistic. In this...
Optical Flow Switching (OFS) is an end-to-end optical circuit oriented network in which optical circuits are created on demand to directly connect pairs of end-users. Circuits are established across three network segments: the access (distribution), the metro and the wide area network. Once the circuit is reserved, the end-user can then fully utilize the optical channel for large data transfers using...
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