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This paper presents a shared canonical signed digit (CSD) complex constant multiplier for high-speed low-complexity parallel fast Fourier transform (FFT) processors. To reduce the number of twiddle factor (TF) multiplications, the mixed radix −24/23 FFT algorithm is adopted for FFT processor. The 512-point FFT processor using the proposed shared CSD complex constant multiplier has been designed and...
This paper presents Powerline Physical-layer Network Coding (Powerline-PNC), a powerline communication architecture that employs physical-layer network coding (PNC). As the first work that applies PNC in powerline communication, we show that Powerline-PNC improves the throughput of bidirectional information interchange in the powerline network by 100% at the SNR cost of 3dB. Specifically, we design...
In this paper, we propose a new single-input multiple-output (SIMO) context-aware cognitive transceiver (CTR) that is able to switch to the best performing modem in terms of link-level throughput and allows to decrease macro transmission power without loosing performances comparing to the conventional Data-aided Least Squares (DA LS) channel estimator. On the top of conventional adaptive modulation...
Coherent detection requires accurate channel estimation to provide the high data rates promised by the LTE standard. However, for high-speed wireless data transmission services, channel estimation becomes a challenging task when the pilot insertion rate becomes insufficient to allow proper tracking of the channel variation. In this paper, we design a new singleinput multiple-output (SIMO) context-...
We consider a system with three single-antenna nodes; Alice talks to Bob over a time-slotted AWGN channel, while Eve's objective is to impersonate Alice. We then consider a setting where, for every received packet, Bob needs to do simultaneous energy harvesting (EH) and sender-node authentication. To this end, Bob employs {\it frequency offset} as the decision metric for binary hypothesis testing...
The special communication scenario in High-Speed Train (HST) not only leads to an increasing demand of high throughput and continuous multimedia services but also arises many other challenges for cellular network access technology, such as high mobility, frequent and group handovers etc. In order to address above problems, we propose an HST WiFi network application scheme which adopts multi-hop technology...
Orthogonal frequency division multiple access (OFDMA) is an effective method to reduce inter symbol interference in LTE systems. Doppler shift, however, leads to a loss of sub-channel orthogonality, resulting in inter-channel interference in high speed environment. Firstly, this paper develops the mathematical formulae describing the interference on resource block (RB) which is the smallest resource...
Recently, interference problem between WiFi devices is serious by thoughtlessly installation of access points (APs). To solve this problem, we suggest interference alignment (IA) algorithm and analyze the link level performance of IA in IEEE 802.11ac specification.
A method of passively estimating the resource block (RB) utilization rate of a serving cell according to radio-quality information measured by a user terminal is proposed. The estimated RB utilization rate can be regarded as the traffic load on the base station. The contribution of this paper is twofold: first, a method for passively estimating a traffic load on a base station via a user terminal...
Network MIMO is a feasible technique that can significantly improve the performance of wireless communication systems by canceling the Inter-cell Interference (ICI). Dynamic Fractional Frequency Reuse (DFFR) is the technique to mitigate ICI in LTE-Advanced system, which improve throughput and capacity, especially for the cell-edge users (CEUs). Recent research has shown that the impact of DFFR scheme...
The spectral efficiency enhancement for 5G air interface represents a technical challenge. In addition to the higher capacity requirement, 5G system will also address massive connectivity demand for 5G applications, such as IoT. A straightforward re-design of OFDM based LTE by using different radio parameter set cannot meet the challenges from the diverse 5G usage scenarios. In this paper, we present...
Under the Advanced Metering Infrastructure, millions of metering endpoints spread over the residential areas need a two way communication network to connect them with the head-end system (HES) through a data collector. The data collector has a high bandwidth gateway to the HES but the last mile network to connect the collector with the endpoints remains a challenge. Narrow band power line carrier...
This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO) detection schemes. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate the performance...
Road transportation is one of the main sources of environmental pollution. Electrification seems like the ideal solution for reducing CO2 emissions, while maintaining all the advantages of modern means of transportation. The shift to electric vehicles needs to be accompanied by an appropriate telecommunications network, which is responsible for the reliable transmission of large volumes of information...
WiMAX technology supports to different MAC and Physical Layer parameters. The performance of TCP Linux in WiMAX network is analyzed by varying MAC layer and Physical layer parameter such as channel bandwidth, cyclic prefix, modulation coding scheme, frame duration, DL: UL ratio, propagation model, full duplex mode of data transfer and other operating parameter such as downloading traffic. These parameters...
One of the key building blocks of the newly emerging 5th generation (5G) wireless communication system are ultra dense small cells. In this paper, the system performance of such a deployment is studied for scenarios where there are individual deadlines to serve data packets. A proactive delay-minimizing scheduling method (PDMS) is proposed to minimize the number of dropped packets due to missed deadlines...
The projected growth of mobile data traffic requires the 5G wireless systems to support at least 1000× larger area throughput than the existing 4G solutions. This requires ultra- dense local area networks combined with fast and flexible time division duplex based access to provide wide bandwidths for multi-gigabit peak data rates. In this paper, we focus on the system level performance characterization...
This paper demonstrates that satellite can relieve the LTE terrestrial network of a significant part of the evolved Multimedia Broadcast Multicast Service (eMBMS) traffic. A system level simulator was designed in order to simulate with a high level of accuracy point to point communications, eMBMS, and satellite broadcast. A Video on Demand scenario was chosen to illustrate the system performance....
Several techniques such as carrier aggregation (CA) and cognitive radio (CR) have been proposed to achieve high data rates to meet the demand of future wireless communication systems. Those techniques pose a strict adjacent channel interference (ACI) requirement. However, currently employed orthogonal frequency division multiplexing (OFDM) systems suffer from significant spectrum leakage and require...
We introduce the concept of bandwidth granularity dynamic adaptation for spectrum allocation using multipath provisioning in elastic optical OFDM networks. Results show that dynamic bandwidth adaptation significantly improves the performance in terms of throughput and blocking probability.
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