Preliminary performance evaluation and verification of digital terrestrial television signal propagation

2021 ◽  
Vol 3 (2) ◽  
pp. 53-66
Author(s):  
Leboli Thamae ◽  
Itumeleng Potsanyane ◽  
Mpho Mokhetsengoane
Keyword(s):  
Performance Evaluation ◽  
Signal Strength ◽  
Signal Propagation ◽  
Capital City ◽  
Digital Television ◽  
Signal Quality ◽  
Measured Signal ◽  
Set Top Box ◽  
Digital Terrestrial Television ◽  
University Town

This article presents the computer simulation and field test measurement results on Channel 29 for the preliminary performance evaluation and verification of the newly-installed Lesotho digital terrestrial television network based on DVB-T2 standard following the guidelines and techniques specified by the ITU-R BT.2035-2. It evaluates, at predetermined outdoor locations for fixed and mobile reception, parameters such as received signal strength, signal quality, bit-error rate (BER) and threshold-of-visibility (ToV) together with TV signal decoding (observation of screen artefacts) for quasi error-free reception. The results indicate that at over 97% of the test sites/points at the university town of Roma, the main Berea Plateau transmitter from the capital city (Maseru) broadcasts digital television service with enough signal level and quality to be properly decoded. The measured signal strength threshold ranges above -50 dBm for good reception, -64 dBm to -50 dBm for acceptable reception and -69 dBm to -64 dBm for poor reception. With the noise floor at about -73 dBm, the minimum required C/N of around 23 dB for good reception and about 4 dB for ToV have been recorded. The relative values of minimum required respective signal strength and signal quality for ToV obtained from the set-top box are 33% and 18% for stationary reception, while they give 37% and 20% for mobile reception.

Universal Access to Health Services Through the Digital Terrestrial Television

2013 ◽  
Vol 6 (1) ◽  
pp. 51-87 ◽  
Author(s):  
Aldo Franco Dragoni
Keyword(s):  
Health Services ◽  
Web Application ◽  
Universal Access ◽  
Western World ◽  
Digital Television ◽  
Local Health ◽  
Access To Health Services ◽  
Set Top Box ◽  
Digital Terrestrial Television ◽  
The Masses

The Western World has almost completed the transition toward the Digital Television (DTV), and in particular toward the Digital Terrestrial Television (DTT). In every home there is at least one decoder for the DTT. Some of them have a modem, to connect to a telephonic return line, and a Smart Card reader, both required by the “Pay TV” channels. Since those readers are compatible with the Governmental Smart Cards, a new access for the masses to secure and confidential digital services is nowadays available in our Information Society. “T-Government” defines the set of services provided by Governments or private entities via DTT. “Multimedia Home Platform” is the standard for DTT applications. A Local Health will be no more justified for offering services only through the Web disregarding both the broadcast and the return channels of the DTT since by doing so it would contribute to deepen the “digital divide” between skilled (young) people and unskilled (elder) people. The author defines a scenario for providing such T-Health Services both for patients (T-monitoring health parameters) and healthy citizens. These latter will have a bunch of services over DTT, not only informative or interactive applications on the Set top Box, but also transactional services through the secure return channel. However, much effort has to be spent to guarantee the usability of that new interface which is quite different from that of a Web application. The author designed, tested and redesigned a suite of DTT applications as a “proof of concept” to show the potential of this new platform for health information services. DTT may represent a real contribution to bring social healthcare and wellness.

scholarly journals A Qualitative Study of Signal Strength Coverage of Digital Terrestrial Television in Ibadan South Western Nigeria

2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Hakeem Sanya Bolarinwa
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Signal To Noise Ratio ◽  
Power Level ◽  
Signal Strength ◽  
Digital Television ◽  
Efficient Data ◽  
Digital Terrestrial Television ◽  
Data Collation

This work investigated the quality of signal strength coverage of the existing Digital Terrestrial Television (DTTV) operator in Nigeria using Startimes Ibadan as a case study. Signal strength and altitude data at different locations within a 40km radius of the Startimes transmitting station were measured to determine the quality of signal strength reception of Startime's digital television in Ibadan metropolis. A signal analyzer, a 10-meter cable, Yaggi external antenna and Global Positioning System (GPS) were used for the measurements at various locations in Ibadan within 40km radius distance of Startimes based station at Agodi in Ibadan. The city was grouped into six different zones for proper signal testing and efficient data collation. Parameters such as signal strength, distance, altitude, signal to noise ratio, modulation error rate, pre-bit error rate and post-bit-error rate were measured and recorded. The effects of distance and altitude were analyzed. It was observed from the result that there is a direct relationship between power level and altitude. In addition, there is an inverse relationship between power level and distance.

scholarly journals Surface Correlation-Based Fingerprinting Method Using LTE Signal for Localization in Urban Canyon

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3325 ◽  
Author(s):  
Jung Ho Lee ◽  
Beomju Shin ◽  
Donghyun Shin ◽  
Jinwoo Park ◽  
Yong Sang Ryu ◽  
...  
Keyword(s):  
Urban Areas ◽  
Service Providers ◽  
Signal Strength ◽  
Multipath Fading ◽  
Location Based Services ◽  
Walking Distance ◽  
Signal Interference ◽  
Measured Signal ◽  
Movement Trajectory ◽  
Fingerprinting Method

The Global Satellite Navigation System (GNSS) used in various location-based services is accurate and stable in outdoor environments. However, it cannot be utilized in an indoor environment because of low signal availability and degradation of accuracy due to the multipath distortion of satellite signals in urban areas. On the contrary, LTE signals are available almost everywhere in urban areas and are quite stable without much variation throughout the year. This is because of the fixed location of base stations and the well-maintained policy of mobile communication service providers. Its varied stability and reliability make LTE signals a more viable method for localization. However, there are some complexities in utilizing LTE signals including signal interference distortion phenomena during propagation multipath fading, and various types of noise. In this paper, we propose a surface correlation-based fingerprinting method to utilize LTE signals for localization in urban areas. The surface correlation converts timely measured signal strength into spatial pattern using the walking distance from a Pedestrian Dead-Reckoning (PDR). The surface correlation is carried out by comparing the spatial signal strength pattern of a pedestrian`s movement trajectory with a fingerprinting database to estimate the location. A reference trajectory of the moving pedestrian is chosen to have a greater correlation among the multiple trajectory candidates generated from a link-based fingerprinting database. By comparing spatial signal strength patterns, the proposed method can improve robustness in localization overcoming the accuracy degradation problem due to RF multipath and noise that are dominant in the conventional RSS measurement-based LTE localization scheme. The test results in urban areas demonstrate that the proposed surface correlation-based fingerprinting method has improved performance compared to the other conventional methods, thus proving to be a useful complementary method to the GNSS in urban areas.

The Hybrid HMM for RSS-Based Localization in Wireless Sensor Networks

2013 ◽  
Vol 347-350 ◽  
pp. 796-802 ◽  
Author(s):  
Yan Hong Zang ◽  
Jin Song Wang ◽  
Lin Ling ◽  
Pei Zhong Lu
Keyword(s):  
Wireless Sensor Networks ◽  
Hidden Markov ◽  
Signal Strength ◽  
Threshold Value ◽  
Signal Propagation ◽  
Propagation Model ◽  
Wireless Sensor ◽  
Node Localization ◽  
Localization Accuracy ◽  
Signal Propagation Model

We proposea method of RSS-base localization in WSN (Wireless Sensor Network), called Hybrid HMM, to improve the stabilityof node localization basedon RSS(Received Signal Strength).This model utilizesHMM(Hidden Markov Model) to takeinto account the time factor when receiving the RSS sequence, andconverts the action of ranging into an operationof classification.For the received RSS used for localization,our Hybrid HMMwill compare it withthe preset RSS threshold value, and put the result into one of two categories for subsequent processing: If the received value is higher than the threshold value, the distance value will be drawn from the signal propagation model. If lower, the information will be obtained from a trained HMM. Experimental results show that the Hybrid HMM method can greatly improve the localization accuracy.

Active RFID Trilateration and Location Fingerprinting Based on RSSI for Pedestrian Navigation

2009 ◽  
Vol 62 (2) ◽  
pp. 323-340 ◽  
Author(s):  
Qing Fu ◽  
Guenther Retscher
Keyword(s):  
Radio Frequency Identification ◽  
Signal Strength ◽  
Signal Propagation ◽  
Rfid Tags ◽  
Iterative Approach ◽  
Cell Of Origin ◽  
International Telecommunication Union ◽  
Pedestrian Navigation ◽  
Location Fingerprinting ◽  
Current Location

In the work package ‘Integrated Positioning’ of the Ubiquitous Cartography for Pedestrian Navigation project (UCPNAVI) alternative location methods using active Radio Frequency Identification (RFID) are investigated for positioning of pedestrians in areas where no GNSS position determination is possible due to obstruction of the satellite signals. In most common RFID applications, positioning is performed using cell-based positioning. RFID tags can be installed at active landmarks (i.e., known locations) in the surroundings and a user equipped with an RFID reader can be positioned using Cell of Origin (CoO). The positioning accuracy, however, depends on the size of the cell defined by the maximum range of the signal. Using long range RFID for positioning the cell size can be quite large, i.e., around 20 m. Therefore, the paper proposes two new methods for positioning, i.e., trilateration and location fingerprinting based on received signal strength indication (RSSI) if more than one RFID tag is visible. The trilateration approach is based on the deduction of ranges to the RFID tags from RSSI. An iterative approach to model the signal propagation will be introduced, i.e., the International Telecommunication Union (ITU) indoor location model that can be simplified to a logarithmic model, and a simple polynomial model is employed for the signal strength to range conversion. In a second attempt, location fingerprinting based on RSSI is investigated. In this case, RSSI is measured in a training phase at known locations inside the building and stored in a database. In the positioning phase these measurements are used together with the current measurements to obtain the current location of the user. For the estimation of the current location different approaches are employed and tested, i.e., a direction-based approach, a tag-based approach, a direction-tag-based approach and a heading-based approach. Using trilateration or fingerprinting positioning accuracies on the one to a few metres level can usually be achieved. The concept and the iterative approach of the different methods and test results are discussed in this paper.

scholarly journals MOBILE ROBOT LOCALIZATION USING WLAN SIGNAL STRENGTHS

2014 ◽  
pp. 73-83
Author(s):  
Christof Röhrig ◽  
Frank Künemund
Keyword(s):  
Mobile Robot ◽  
Communication Technology ◽  
Euclidean Distance ◽  
Signal Strength ◽  
Office Building ◽  
Measured Signal ◽  
Robot Localization ◽  
Omnidirectional Antenna ◽  
Mobile Robot Localization ◽  
Radio Map

Many buildings are already equipped with a WLAN infrastructure, as an inexpensive communication technology. In this paper two methods that estimate the position and the heading (pose) of a mobile robot using WLAN technology are described. The proposed techniques for localizing a mobile robot are based on the use of received signal strength values of WLAN access points in range. Both use a radio map based method. For interpolation of the radio map weigthed Euclidean distance and Euclidean distance in combination with Delaunay triangulation is proposed. Measured signal strength values of an omnidirectional antenna and a beam antenna are compared with the values of a radio map, in order to estimate the pose of a mobile robot, whereby the directionality of the beam antenna is used to estimate the heading of the robot. The paper presents the experimental results of measurements in an office building.

scholarly journals Research and Simulation of Handover Algorithm in Mobile Communication System

2021 ◽  
Vol 2074 (1) ◽  
pp. 012039
Author(s):  
Lihua Sun
Keyword(s):  
Mobile Communication ◽  
Target Cell ◽  
Communication System ◽  
Control Algorithm ◽  
Signal Strength ◽  
Signal Quality ◽  
Mobile Communication System ◽  
Control Threshold ◽  
Threshold Setting ◽  
Handover Algorithm

Abstract In order to improve the handover rate and quickly handover the target cell, the handover control algorithm of the mobile communication system is explored, and the handover algorithm that combines signal strength and signal quality is researched. At the same time, it is experimentally demonstrated, and the handover user and the new user will be connected. The influence of the entry control threshold setting on the system was compared.

Sign in / Sign up

Export Citation Format

Share Document