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Power consumption is a key issue for wireless network design. Cooperative routing, an efficient scheme for saving transmission power in wireless networks, combines the advantage of the cooperative communication in the physical layer and the routing technology in the network layer. In this paper, we propose a distributed minimum power cooperative routing algorithm based on optimal power allocation,...
A digital communications receiver requires precise symbol synchronization before the transmitted information can be recovered. Gardner's algorithm is a synchronizer that can acquire and track timing with only two samples per symbol, and it does not require prior carrier synchronization. In this paper, a feed-forward, all-digital version of Gardner's algorithm is presented. It is shown that this synchronizer...
Rapid and random temporal fluctuations in amplitude and phase of signal caused when GNSS signals are propagating through irregularities in electron density of the ionosphere are called amplitude and phase scintillation. Ionospheric scintillation can degrade receiver tracking performance, and in extreme cases, out of lock entirely. The elfect of amplitude scintillation on the signal is similar to that...
This work presents a self-adaptation algorithm to automatically adjust the peaking settings of a continuous-time linear equalizer (CTLE) in a high-speed PAM4 receiver. A statistical approach is adopted to improve the robustness and flexibility of the adaptation algorithm. The PAM4 top level distribution around the peak value of several consecutive top levels guides the CTLE to attain the optimal digital...
In a binary input additive white Gaussian noise (BIAWGN) channel, belief propagation (BP) decoding for luby transform (LT) codes requires the knowledge of the signal-to-noise ratio (SNR) at the receiver to achieve its optimal performance. An erroneous estimation of the SNR at the decoder is referred to as “SNR mismatch”. SNR mismatch can significantly degrade the BP decoding performance of LT codes...
The mobile underwater acoustic channel has brought a great challenge on the encoding and decoding process. The recent development of underwater acoustic processing method aims to get a lower bit error rate(BER). However, the controdiction between lower BER and real-time transmission are not well solved. In this paper, we reach a compromise between them, we combine the turbo code with the adaptive...
Brain Computer Interfaces (BCIs) provide a direct communication channel between human brain and environment. Synchronous BCIs assume that BCI users are always at control state and definitely produce a control command after a predetermined number of flashes. On the other hand, asynchronous BCIs determine the moments that BCI users focus on the BCI system to make command selection and produce control...
In order to realize the rapid satellite selection of BDS / GPS dual-mode navigation system under the premise of satisfying the normal positioning accuracy, a new fast satellite selection algorithm is proposed. The algorithm combines the traditional satellite selection algorithm with genetic algorithm. The satellite area is divided by the elevation angles information of the visible satellite, according...
The prevalence of camera-equipped smartphones and optoelectronic displays opens up a novel framework for wireless communication-optical camera communication. With displays as transmitters and cameras as receivers, a reliable optical communication link is established. In practice, the frame synchronization between transmitters and receivers is an inevitable challenge confronted in this new communication...
The number of applications that rely on robust indoor localization is constantly growing. Conventional outdoor localization technologies are generally not suited for indoor use. WiFi-based indoor localization systems are a widely studied alternative since the necessary infrastructure is already available in most buildings. Existing WiFi-based localization algorithms, however, still face challenges...
We investigate the problem of index coding, where a sender transmits distinct packets over a shared link to multiple users with side information. The aim is to find an encoding scheme (linear combinations) to minimize the number of transmitted packets, while providing each user with sufficient amount of data for the recovery of the desired parts. It has been shown that finding the optimal linear index...
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...
Cooperative detection system, which combines selforganizing network and single radar system, improves the ability of cooperative localization by distributed multi-node using multi-direction scattering power of target. Multiplehypothesis (MH)-Based Algorithm for Target Localization finds all possible targets using multi-path echo information with unknown number of targets, and realizes multi-target...
In the Stokes vector direct detection (SV-DD) system, we extend a previously-proposed simple blind polarization demultiplexing (POL-DEMUX) algorithm for PSK constellations to QAM constellations. We numerically analyze the POL-DEMUX performance and confirm that the blind POL-DEMUX process can be successfully done with negligible power penalties for high-order modulation formats such as 8-PSK, 16-PSK...
Development of modern infocommunication and radiotechnical systems demands creating of postcorrelation theory for adequate representing of signal-noise situation when signals and noises have non-Gaussian distributions. In the report, the proof of the existence of integral transformation of one-dimension variate is presented. Conditions of existence and properties of stochastic spectra are shown. The...
The existing algorithms for the selection and switching of signal-code sequences (SCS) in IEEE 802.11 wireless equipment are analyzed. Indicators and criteria for assessing the efficiency of existing SCSs switching algorithms are reviewed. Suggested algorithms for switching SCS are proposed taking into account advantages and disadvantages of such algorithms.
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...
The present paper discusses different techniques of measuring Carrier-to-Noise density ratio (C/N0) in navigation and information-communication systems. C/N0 means the ratio of the received signal power to the noise spectral density N0 at receiver's input (at the output of an antenna with a low-noise amplifier (LNA)). Correlation processing is performed in the receiver to obtain in-phase (I) and quadra-phase...
Ultra-dense networks are regarded as a promising candidate for providing high data rate at low implementation cost. With a dense and irregular deployment of access points, spatial reuse will be improved, and varying cellular coverage also known as the amorphous cell is provided, which leads to a more complicated interference environment. In this paper, a novel interference coordination strategy, based...
In the dual-polarized channel, the power amplifier (PA) energy efficiency is decreased by cross-polarization discrimination (XPD) effect which introduces cross power leakage and then reduces the BER performance of polarization modulation (PM). Therefore, an XPD compensation algorithm based on PM for the PA energy efficiency improvement is proposed. Firstly, the effect of energy efficiency caused by...
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