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Device-to-device (D2D) underlay communication has attracted substantial research attention recently owing to its potential to enhance the network throughput. However, the caused intra-cell interference is quite a challenging issue in D2D underlaying cellular network. In this paper, we investigate the joint power control and resource allocation problem to improve the system performance in such a scenario...
In this paper, an active mixing UHF-Band 8 channels digital array module is introduced. Eight independent RF and digital transceiving channels are integrated. three-dimensional layout, standardization and modularization design are adopted. The power supply is only 28 V, signal control and data transmission go through optical fiber. Good measured results are obtained.
Abstract-Interference is a key problem for multi-cell networks and interference alignment (IA) is a promising method to manage interference. This paper investigates whether a feasible IA scheme can improve the system performance of Device-to-Device(D2D) communication underlaying multiple-input-multiple-output (MU-MIMO) uplink in multi-cell networks. We propose a novel cell division pattern based on...
We investigate three EDFA only amplification architectures for 100G unrepeatered transmission. With > 4 dBQ margin, pre-amplifier only, booster only and both booster and pre-amplifier amplifications can achieve 130, 150 and 220 km reach respectively.
As everyone knows, the energy of signals diminishes with increasing distance, so users at the edge of hexagon cells have lower signal-to-noise ratio (SNR) than users at the center, which means they are more easily interfered by signals from other base stations. So we consider the application of relay to the cellular case to help users at the edge to eliminate interferences and obtain higher sum-rate...
It is well known that relay is able to neutralize some interferences in destinations. In this paper we use not only relay to neutralize interferences but also interference alignment to reduce the number of antennas needed in destinations. To this end, a scheme of cognitive relay-aided interference neutralization and alignment is proposed. To neutralize and align interferences, the relay needs to retransmit...
Previous work on 802.1 1x (Wi-Fi) power control have focused almost exclusively on the mitigation of interference from data frames. Since Wi-Fi wireless access points are increasingly ubiquitous, it is now common for an 802.1 1x client to be able to receive signals from more than 10 APs simultaneously in a modern urban operating environment. At such high densities, we found that the interference from...
GNSS receivers are vulnerable to replay attacks. Main of previous works suppose all visible GNSS satellites' signals are manipulated by repeaters, which launch replay attacks, and a victim GNSS receiver processes spoofing signals but not legitimate signals. However, in navigation confrontation environment, the supposing is quite difficult to meet. To this end, here a more practicable scenario called...
Considering its central importance to sensor networks, time synchronization has received extensive attention by the research community. Nevertheless, we argue in this paper that existing approaches introduce undesirable trade-offs. For example, while GPS offers excellent accuracy for outdoor deployments, the high cost and power consumption of GPS receivers make them prohibitive to many applications...
In order to suppress the multi-path interference (MPI) in the DS CDMA system, a new RAKE receiver based on parallel interference elimination is first proposed in this paper: data symbol tentative decision is obtained by linear decision; the multi-path interference are evaluated by tentative decision and known user information. Then the performance over Rayleigh fading channel are analyzed and compared...
A proved affine projection algorithm (APA) is proposed for uplink asynchronous multicarrier code-division multiple-access (MC-CDMA) systems with multipath Rayleigh-fading channel. The proposed technique is totally blind, i.e., the channel estimation of desired user (the spreading code is known) is carried out by subspace separation, which doesn't need the rank estimation in the first step, then the...
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