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For some students, learning signal processing could sometimes be a bit complicated due to the importance of the mathematical background that underlies this field. In this paper, we present two real-life experiments that allows to introduce, in a very natural way, most of the standard tools of signal processing. This teaching, aimed at undergraduate students, is divided in two parts. One exploiting...
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...
To implement 8K Advanced BS receiver system, 8K HEVC decoder SoC is developed as key component. To solve the exceeded required memory bandwidth over physical memory bandwidth limitation issue for realizing 8K decoder, two types of multi-cast write back scheme, including reference data multi-cast write back and output data multi-cast write back, are introduced. 8K HEVC decoder chip is fabricated in...
Satellite networking is known to suffer from specific network performance issues, such as high latency and low throughput stability; this derives mainly from the high propagation delay, in particular with GEO satellites. This characteristic poses limitations on the benefits that general AQM solutions could introduce; in fact, reducing congestion and mitigating queueing delay is a vital feature that...
A particular problem in satellite communications is the estimation of the current operating point of a bent-pipe transponder. Various special effects aggravate this estimation problem, among which the capture effect, gain compression, unknown attenuation in the transmission channel, or noisy received signals are the most prominent. In most practical cases, operators desire a fully blind estimator...
Compared with hardware receiver, the GPS software receiver has higher design flexibility, small size and low price, so it has a wide range of research prospects. In this paper, the GPS signal acquisition and tracking algorithm is studied. We use the collection and playback equipment to emulate the GPS signal and validate the acquisition and tracking algorithms. In the acquisition phase, the performance...
Satellites give exceptional points of interest, for example, remote scope with fast sending, separation lack of care, transmission capacity on interest, safety to physical debacles, and offering broadband connections. TCP has been produced for wired systems that have a lower delay and a low piece mistake rate. It is the most usually utilized transport layer convention as a part of the Internet and...
Severe performance degradation of Global Navigation Satellite Systems (GNSS) is produced in urban scenarios, mainly due to dense multipath and non-line-of-sight (NLoS) conditions. Thus, the integration of GNSS with additional positioning systems, such as the location methods in Long Term Evolution (LTE) cellular systems, may cope with these challenging scenarios. This work proposes a generic evaluation...
We study the benefits arising from the exploitation of interference in two satellite communications scenarios. We show that promising gains, with respect to the classical interference avoidance approach, can be achieved by applying non-orthogonal transmission schemes together with advanced transceiver architectures. We demonstrate that the non-orthogonal solutions significantly outperform the classical...
We investigate the problem of increasing the spectral efficiency of current high rate telemetry systems in two different scenarios, which exploit one and two channels, respectively. We will analyze several techniques aimed at improving different stages of the transceiver scheme. We will optimize the transmission parameters and apply advanced receiver architectures, able to take into account part of...
With The structural design of the INS-aided (Inertial Navigation System-aided) receiver tracking loops is the main part of implementing an SINS(Strapdown Inertial Navigation System)/GPS Ultra-Tightly Coupled Integrated Navigation System, and the loop bandwidth is the key factor to determine the performance of the tracking loop. Considering satellite signals are easy to be out of locking in high dynamic...
As one possible continuation of development of Masat-1, the first Hungarian satellite, in 2015, a group of student, from Faculty of Electrical Engineering and Informatics and Mechanical Engineering, decided to realize a PocketQube-class satellite, called Smog-1. Smog-1 is a 5 cm cubesat as PocketQube with less than 180 g mass. The aim of Smog-1 is to measure the radio frequency (RF) smog caused by...
Since several years, satellite communications are playing a remarkable role in telecommunications infrastructures, thus the increasing interest in transporting internet traffic over satellite links. Many technologies such as the deployment of multicast and real-time audio/video streaming application are likely to increase the percentage in the context of TCP traffic in internet. The Transport Control...
The earth-satellite propagation in Ka-band and above is severely compromised by tropospheric phenomena such as rainfall, clouds and variations of the atmosphere refractive index. Commercial exploration of these bands requires the use of mitigation techniques of propagation conditions to become commercially competitive. Whatever the technique used, the characterization of the propagation channel requires...
This paper aims at evaluating pilot-based estimation technique for SC-FDMA LTE deployed via high altitude platforms (HAPS) channel. HAPS is a novel wireless infrastructure in which one of its applications is to carry cellular system such as 4G LTE. The problem of SC-FDMA LTE signal transmission over HAPS channel is due to multipath from objects nearby the mobile user. Signal at the receiver, which...
We propose receiver architecture for FTN signaling transmission in the DVB-S2 standard. Typically, ISI- free condition has been assumed for DVB-S2 receiver design when satellite transponder model is absent. However, it's necessary to modify the receiver for FTN signaling since ISI becomes major issue. In this work, we take into account an example model as complete receiver for FTN signaling in DVB-S2...
Live aerial observations from field to control and operations centers, in form of photos and video for visual situational awareness, are valuable in several mission-critical operations, such as disaster management, search and rescue, border control, police operations, security and safety. The use of small UAVs to obtain these observations is attractive, but often challenged by lack of suitable solutions...
In mission-critical visual communications, and situations where the need for network capacity a concern, focus is on the impact images may have for operations, not the technical quality of the image. By focusing communications capacity on operationally relevant content, savings in network loads over 99% are realistic while keeping full image quality for relevant parts. Based on several space projects,...
In this paper, we intend to give an exemplary receiver architecture for Faster Than Nyquist(FTN) signalling transmission that is applicable to DVB-S2 standard. In order to ensure higher spectral efficiency(SE) than the existing DVB-S2 standard based on Nyquist rate, symbol time interval can be reduced by relaxing the orthogonal criterion. As a result, the problem of inter symbol interference(ISI)...
This paper presents the design and simulation of a typical Ka band satellite beacon receiver for propagation experimentation. Using satellite beacon signal as a reference signal in satellite wave propagation study is one of the most important methos. Satellite beacons are frequently available for pointing large antennas, but such signals can be used for measuring the effect of natural phenomena such...
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