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We study the performance of a multibeam satellite system under different frequency reuse schemes. We provide an information theoretical framework to analyze the achievable rates in two beams sharing the same frequency, based on single-user and multiuser detection. We compare two alternative strategies to serve two users in two beams, showing that interesting gains are possible by using multiuser detection...
In this paper, we study the link scheduling problem considering the fluctuating fading effect in transmissions. We extend the previous deterministic physical interference model to the Rayleigh-fading model that uses the stochastic propagation to address fading effects. Based on this model, we formulate a problem called Fading-Resistant Link Scheduling (Fading-R-LS) problem, which aims to maximize...
In this paper, we consider a heterogeneous cellular network with a macrocell and several femtocells. In each femtocell, the femto base station (FBS) serves one femto user (FU), which is capable of simultaneous wireless information and power transfer (SWIPT) energy harvesting (EH) in a power splitting manner. All FBSs suppress their interference to macro users (MUs) via a interference power constraint...
In this paper, minimum MSE based interference alignment (IA) algorithm is developed for the interfering broadcast channel (IBC), which models the multi-cell downlink system, underlying cognitive radio, device-to-device and other scenarios. The IA precoders and decoders are computed to minimize the MSE. Cascade design is used for IA precoder design, where the first component precoder is obtained by...
We identify phase noise as a bottleneck for the performance of digital self-interference cancellers that utilize a single auxiliary receiver — single-tap digital cancellers — and operate in multipath propagation environments. Our analysis demonstrates that the degradation due to phase noise is caused by a mismatch between the analog delay of the auxiliary receiver and the different delays of the multipath...
5G network is visualized to simplify the burden on current cellular infrastructure by offering significantly higher data rates through increased channel bandwidth. 5G communication system is expected toexploit spectrum band at millimeter wave (mmWave)frequencies. But the mobile communication at these mmWave spectrum band is far more complex than the current frequencies that are being used around the...
In the communication process, when channel capacity is large enough, channel quality is decided by the wrong acceptance sequence of data packet due to channel interfere, communication limited and so on. This paper surveyed the effect of channel on data sequence reception. The simulation show the relationship between acceptance sequence and channel quality.
This paper analyzes and evaluates joint effect of primary interference and artificial noise on information securing capability of cognitive radio networks (CRNs) under interference power constraint, peak transmit power constraint, and Rayleigh fading. An exact formula for an important security performance metric, secrecy outage probability, is first derived and then validated by computer simulations...
Channel assignment is a key problem in Cognitive Radio Networks. The channels are leased to the secondary users when the licensed or primary users are OFF, provided that the secondary users will leave those channels as soon as the primary users are reactivated. Therefore, to achieve a high performance of the network, we should lease a channel to a secondary user while both of them achieve the best...
The Orthogonal Frequency Division Multiplexing (OFDM) is widely used in the wireless communication systems. The robustness in a wireless environment combined with the ease to perform the channel estimation (CE) are the reasons for the OFDM popularity. Commonly, the channel estimation(CE) is performed in frequency domain using pilot tones. It is known that the wireless communications may be affected...
Ultra-dense cellular networks are emerging as one key characteristic of 5G wireless networks. In this context, frequency reuse is a fundamental technology enabler for efficient utilization of limited spectrum resources. In this paper, we investigate the in-band Full-Duplex (FD) self-backhauling architecture, in which Base Stations (BSs) operate on the same spectrum used by the users to access the...
In this paper, we study new schemes to maximize network and users' minimum EE energy efficiency through transmission power control. The problem is formulated as fractional optimization programming and solved with a successive convex approximation. The EE metrics are analysed via extensive numerical simulations under different clustering algorithms, namely a variant of nearest neighbor clustering and...
Using ITU-R P.1546 model for propagation loss prediction of airborne ultrashort wave communication. On this basis, we give the calculation formula of signal to interference ratio of the ultrashort wave communication receiver when the enemy using Gaussian white noise for repressive interference. We also give the calculation method of the bit error rate of the digital communication system when it's...
To acquire GPS signal in challenging environments, a new acquisition scheme based on cyclostatistic is presented. The scheme is constructed on the base of cyclostationary features of GPS signal which is different from noise and interference significantly. Stimulations results show that the proposed cyclostatistic based method outperforms the conventional GPS acquisition method.
In dense wireless networks (large number of users) and under high traffic loads, inter-user interference constitutes a factor limiting network's performance. Successive Interference Cancellation (SIC) has successfully counteracted this problem. Nonetheless, the aggregate Packet Error Rate (PER) when SIC is employed heavily depends on the users' symbol energies. We show that in a wireless (satellite)...
It is reported that the urgent task of radio engineering is the task of expanding the dynamic range of radio receivers and bringing it into line with the input effects in the real electromagnetic environment. The characteristic of the dynamic range and the problems associated with insufficient dynamic range. Found that building a reliable and multi-functional devices is impossible without wide dynamic...
In this paper, we propose, design, and evaluate the use of transmitters mapping with a symbols encoding techniques to mitigate inter-symbol interference (ISI) and improve the overall VLC system performance while using a very simple receiver (single element wide field of view, (FOV)) with an OOK modulation scheme. The proposed technique with the laser diodes transmitters are able to provide data rates...
The individual applications of network coded opportunistic routing and successive interference cancellation have been proven with significant improvement on throughput performance of wireless multi-hop networks, but there lacks practical optimization on their combination application. Based on a TDMA system, this paper models the throughput maximization as network utility function maximization problem...
In this paper we analyze adaptive classification algorithm for digital amplitude-phase modulated signals in flat fading channel with non-Gaussian additive noise, representing possible interference in the channel besides thermal receiver noise. We represent additive noise via normal mixture model, which is able to model various interference scenarios by choosing specific mixture parameters. The adaptive...
Channel state information (CSI) has been recently shown to be useful in performing security attacks in public WiFi environments. By analyzing how CSI is affected by the finger motions, CSI-based attacks can effectively reconstruct text-based passwords and locking patterns. This paper presents WiGuard, a novel system to protect sensitive on-screen gestures in a public place. Our approach carefully...
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