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A major drawback of orthogonal frequency division multiplexing (OFDM) is the frequency offset sensitivity. It mainly leads to inter-carrier interference, which can effectively be reduced by employing the pulse shaping filter method. In this manuscript, we present and then optimize the improved double-jump 1 (IDJ1) pulse for digital video broadcasting over cable 2 OFDM systems. Our function is finally...
Recently, the development of wireless body area network (WBAN) is accelerated due to rapid development of wireless technology. In the WBAN environment, many WBANs coexist where communication ranges overlap with each other, resulting in the possibility of interference. Since many variety of applications exist in the WBAN environment, each prospective user may have different quality of service (QoS)...
Data and energy integrated communication networks (DEINs) have emerged for simultaneously realising both of wireless energy transfer and wireless data transfer by exploiting radio-frequency signals. A heterogeneous DEIN is studied, which consists of both indoor and outdoor user equipments (UEs). In order to characterise the diverse data and energy requirements of UEs, a utility function is defined...
Electromagnetic interference can degrade radio receiver severely. For this purpose, there is a need to monitor and quantify interference incidents in radio frequency bands. With this goal, a detection method is developed that is intended to be used in a portable detection system for interference detection in frequency bands, where radio transmissions are sporadically appearing. The method is used...
In this work, we present the design of a novel large load-controlled multiple-active multiple-passive (LC-MAMP) antenna array that operates at 19.25 GHz. In addition, we describe a method that enables us to perform robust, low-complexity, arbitrary channel-dependent precoding with such arrays as well as a communication protocol that limits the computational complexity associated with beam tracking...
Intercarrier interference severely limits orthogonal frequency-division multiplexing (OFDM) performance. Nevertheless, it can be mitigated by using Nyquist-I pulse shaping filters. In OFDM-based systems, we assess the exponential linear (EL) pulse and compare it with the best Nyquist-I pulses. EL pulse is characterized by having one additional design parameter, known as β. It is first optimized through...
Personal audio reproduction systems deal with the creation of personal sound zones within a room without the necessity of using headphones. These systems use an array of loudspeakers and design the required filters at each loudspeaker in order to render the desired audio signal to each person in the room as free of interferences as possible. There are very interesting proposals in the literature that...
We consider wireless information and power transfer in a multi-user massive multiple-input multiple-output (MU-Massive-MIMO) system, where several distributed antenna sets, also denoted as remote radio heads (RRHs), are deployed, while the users can simultaneously perform information detection and energy harvesting. Assuming a large number of antennas and autonomous power allocation for the information...
Offloading users from an overloaded macro base station (BS) to a lightly loaded small cell BS is critical to alleviate the congestion of the macro BSs. However to overcome the signal-to-interference-plus-noise ratio (SINR) degradation of the offloaded users, offloading should be done in conjunction with an efficient interference management technique. Strict fractional frequency reuse (Strict-FFR)...
The downlink of a two-layered heterogeneous hexag- onal cellular network is studied with macro base stations (MB), small cell base stations (SB) that act as half duplex analog relays, and mobile terminals (MT). The first layer is a point- to-multipoint wireless backhaul between macro base stations and small cell base stations, and the second layer is the transmission layer between SBs and MTs. The...
The transmission capacity of WL-MANET (one kinds of wireless mobile local area network that consists of ad hoc nodes) is constrained by the mutual interference of concurrent transmissions among ad hoc nodes. We study a graph theory strategy and the impact to transmission capacity by the interference between the ad hoc nodes, and present methods for computing the transmission capacity for the given...
Caching at the edge is a promising technique to cope with the increasing data demand in wireless networks. This paper analyzes the performance of cellular networks consisting of a tier macro-cell wireless backhaul nodes overlaid with a tier of cache-aided small cells. We consider both static and dynamic association policies for content delivery to the user terminals and analyze their performance....
In many practical cases, one-tap equalizers achieve a close to optimum performance in filter bank multi-carrier modulation systems. However, if the channel is highly doubly-selective, that is, time-selective and frequency-selective, enhanced equalization methods might be necessary. In this paper, we generalize the n-tap Minimum Mean Squared Error (MMSE) equalization, proposed in literature, by also...
In this work, a multi-floor Poisson point process (MFPPP) model is proposed to analyze the performance of wireless networks inside a building, where the impact of penetration loss and floor height on the network performance is taken into consideration. According to the proposed MFPPP model, the coverage probability of the cross-floor max-signal-to-interference-plus-noise-ratio (SINR) association (CFMSA)...
In this paper, we optimize the the symbol error rate (SER) performance of full-duplex (FD) amplify-and-forward (AF) relay system by adopting the joint power allocation and relay location optimization. We first derive the asymptotic expressions of the outage probability and SER performance under the consideration of the loop interference. We then formulate the optimization problem based on the minimal...
With ultra-dense networks (UDNs) becoming one of key technologies for the fifth generation (5G) networks, it is an important problem to evaluate the impact of user mobility on UDNs. In this paper, random way point mobility models and the stochastic geometry theory are utilized to evaluate the energy efficiency of 5G UDNs. Considering the random deployment of base stations, the coverage probabilities...
Although Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in LTE and other systems, the problem of large band leakage caused by the Doppler effect restricts the further improvement of performance when the user moves at high speed. The Filter bank based multi-carrier (FBMC) technology is one of the effective techniques which could replace OFDM in 5G communication systems...
Cognitive heterogeneous cellular networks (CHCNs) and multi-user multiple-input multiple-output (MU-MIMO) are both promising technologies in the future network where wireless transmissions are inherently vulnerable to security breaches. Under an interference constraint set by the primary user, this study examines the impact of MU-MIMO technology on secure communication between cognitive base stations...
Deploying dense small cell networks overlaying to the conventional macro cell networks is widely regarded as a key step towards network architecture revolution for improved coverage and user rate. Small cells have different kinds, and a target coverage can be achieved through deploying different kinds of small cells. Previous works mainly focus their attention on the optimization of spectrum and energy...
In a conventional cellular wireless networks, single cell processing (SCP) is usually considered where inter-cell interference is treated as noise. As we know, interference can cause severe information leakage for secret communication, the paper studies the secrecy performance with coordination beamforming (CBf) scheme in the downlink of a two-cell multi-user MIMO (MU-MIMO) cellular network. For CBf,...
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