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Chinese existing railway upgrading plan was proposed that the ground Balise could provide the data to the Train Control Record Device (TCRD). Because of the huge data requirement for the TCRD, the Balise data capacity should be expanded. Five technical proposals were mentioned and compared with each other. And the Dual-channel proposal, which consists of the Frequency-Shift Keying (FSK) channel and...
Spectrum trading benefits secondary users (SUs) with accessing opportunities and primary users (PUs) with monetary gains in cognitive radio networks. In the spectrum trading market, bidding privacy is a serious concern for SUs, since untrustworthy PUs or spectrum traders may leverage bidding information to manipulate the trading or leak SU's bids to other SU competitors for illegal gains. Current...
The reverberant speech segregation is a basic problem in speech enhancement and automatic speech recognition. Based on the deep neural networks (DNN), a novel binaural speech segregation method is proposed. The binaural feature is extracted and used as the cue to train a DNN with a ideal parameter mask. The trained DNN is used to distinguish the target speech and noise, and output the estimated parameter...
The use of adaptive interference cancellation (AIC) to solve the problem of the radiation interference of a transceiver system has attracted more and more attention. This paper analyzes the noise characteristics of a receiving system which uses an AIC technique for RF front-end filtering, and presents closed-form expressions for noise figure (NF). The comparison of differences between the noise performances...
The time delay matching between cancellation path and radiation interference coupling path, in the analog broadband interference cancellation system, is very important. In this paper, we define instantaneous cancellation bandwidth based on the carrier frequency, and deduce the interference cancellation ratio (ICR) in detail with the consideration of large loop time delay mismatch. The numerical relation...
In recent years, to meet the increasing demandsfor vehicular communications, cognitive radio(CR) technology have been used to make the communication more effectively. In this paper, we propose a spectrum sensing channel model based on cooperative interference and interleaved channel which consists of two stages transceiver in vehicular network. This model makes use of CR technology with switching...
Security is the guarantee to fully exploit the advantages of satellite communication networks. In this paper, the techniques of physical layer security are considered in multi-beam satellite networks. Physical layer security may be an effective way to improve the capability of anti-intercepting and anti-detecting of the satellite communication system. Necessary applications of physical layer security...
Heterogeneous network is supported to improve the link performance in LTE Rel. 10+. The network introduces co-existence of Macro and Pico cell which can alleviate the potential traffic congestion caused by increased user density. Along with the co-existence of difference cells comes the disadvantage of inter-cell interference. Although almost blank subframe (ABS) is proposed to mitigate the interference,...
Traditional cellular network standards require users downlink(DL) and uplink(UL) associated to the same BS. However, due to the power gap between BSs and users and different transmission environment(e.g. the path gain) of DL and UL, a serving BS with the strongest downlink would yield to a non-serving BS in the uplink. In this paper we propose the DL/UL splitting user association framework under a...
Throughput scaling laws for two coexisting ad hoc networks with m primary users (PUs) and n secondary users (SUs) randomly distributed in an unit area has been widely studied. Early work showed that the secondary network performs as well as stand-alone networks, namely, the per-node throughput of the secondary networks is equation. In this paper, we show that by exploiting directional spectrum opportunities...
It is important to know the profiles of partial discharge (PD) signals caused by different interior defaults in GIS and measured by outer ultra-high frequency (UHF) antenna prior to their default identifications. In this paper, four classes of typical physical models in GIS were structured and tested to produce UHF PD signals for the samples of PD identification. Furthermore, the exterior UHF PD signals...
With the sharp increasing demand of the indoor coverage and network capacity, dense femtocells are the ultimate target of the femto cellular network deployment in urban environment However, dense femtocell deployment could introduce excessive inter-femtocell interference (IFI). To address this problem, this paper proposes a distributed power self-optimization scheme for the downlink of dense femtocell...
This paper presents the performance evaluation of a TD-LTE/DTV heterogeneous system. Two coexisting scenarios are considered, DTV interfering with TD-LTE, and TD-LTE interfering with DTV. The TD-LTE uplink and downlink in both urban and rural environments are examined. Both the LTE capacity loss and DTV coverage loss are evaluated. Results are presented which indicate that the interference from DTV...
As one of the most powerful tools in game theory, double auction is widely utilized to tackle the spectrum allocation problem in a secondary market. In this paper, we propose a multi-unit double auction framework in which the conflict graph-based bidder group formation, the winner determination strategy, and the spectrum pricing are elaborately designed. Through an in-depth theoretical analysis, we...
Efficient spectrum utilization is of great importance in cognitive networks, however current spectrum sharing techniques in the temporal or spatial domains all have deficiencies. In this paper, we propose a joint spatial and temporal spectrum sharing scheme based on the concept of regions. We define four regions, namely a primary exclusive region (PER), a temporal spectrum sharing region (T-SSR),...
In this paper, we investigate the connectivity of random cognitive radio networks with different routing schemes. Two coexisting ad hoc networks are considered with m primary users (PUs) and n secondary users (SUs) randomly distributed in a unit area. The relation between n and m is assumed to be n = mβ. We show that with the HDP-VDP routing scheme, which is widely employed in the analysis of throughput...
This paper presents a game-theoretic approach of power allocation in two-tier OFDMA femtocell networks. A dual-utility based non-cooperative game with pricing is formulated for effectively allocating power on each sub-channel, targeting at maximizing energy efficiency for each macro BS and protecting the SINR for each femto BS for customers' interests, under power constraints in each sub-channel....
Interference management is one of the most important issues in two-tier femtocell networks in which a central macrocell underlaid with several femtocell hotspots. To address the cross-tier and co-tier interference, this paper introduces an energy-efficient power control algorithm via convex pricing scheme, where both circuit and transmit power have been considered. To achieve the target SINR, the...
Due to large-scale and self-deployed of femtocells overlaid on traditional cellular networks, serious cross- and co-tier interference may arise without good coordination. To address this problem, this paper proposes a distributed power control scheme for the uplink transmission of two-tier OFDMA femtocell networks. Two models are considered: single-channel femtocell networks and multiple-channel femtocell...
This paper investigates the downlink power allocation problem to mitigate the cross- and co-tier interference in the spectrum-sharing two-tier OFDMA femtocell network, which are comprised of macrocells underlaid with femtocells. The problem is formulated as a non-cooperative game with dual-utility. To achieve green radio access, the objective of the utility for each macro BS is to maximize its energy...
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