Performance of a transmit delay scheme in digital simulcast environment

Download

index.pdf

Date

2004

Author

Özgür, Ayfer

Metadata

Show full item record

Item Usage Stats

48
views

37
downloads

Simulcasting is a spectrally efficient wide area coverage technique that can be advantageous in private mobile radio applications such as emergency services. In a simulcast network, multiple base stations broadcast the same information on a single nominal carrier frequency, causing severe multipath interference at a receiver in the overlap region of several neighboring base stations. In this thesis, we introduce a transmit delay scheme for simulcast networks and investigate the performance of the scheme in LOS and Rayleigh fading environments. In this scheme a relative transmit delay is introduced between neighboring base stations to extend the differential delay between different paths in the overlap regions, from the order of the carrier period to the order of the symbol period, thus transform RF carrier interference into ISI. The receiver employs MLSE to obtain diversity gain from ISI. The performance of the system is evaluated using analytical bounds and simulations carried out for an MLSE based p/4 DQPSK receiver and the results show that the proposed scheme operates succesfully, turning destructive interference disadvantage into a multipath diversity advantage, provided that a sufficient delay is used between the base stations. The أsufficientؤ delay value is determined by considering the coverage properties of the scheme and is in fact أoptimumؤ, since more than sufficient transmit delays result in useless increased receiver complexity. We provide our results using parameters for the TETRA system, however, the results of the work can readily be used for other systems.

Subject Keywords

Telecommunication (including telegraphy, telephone, radio, radar, television).

URI

http://etd.lib.metu.edu.tr/upload/12605179/index.pdf
https://hdl.handle.net/11511/14293

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Reliable real-time video communication in wireless sensor networks Ayran, Orhan; Akan, Özgür Barış; Department of Electrical and Electronics Engineering (2007) Many wireless sensor network (WSN) applications require efficient multimedia communication capabilities. However, the existing communication protocols in the literature mainly aim to achieve energy efficiency and reliability objectives and do not address the multimedia communication challenges in WSN. In this thesis, comprehensive performance evaluation of the existing transport protocols is performed and it has been shown that the existing proposals achieve very poor performance in terms of large set of me...
Range resolution improvement of fmcw radars Kurt, Sinan; Demir, Şimşek; Department of Electrical and Electronics Engineering (2007) Frequency Modulated Continuous Wave (FMCW) radar has wide application areas in both civil and military use. The range resolution is a critical concept for these FMCW radars as for the other radar types. There are theoretical restrictions in the range resolution. In addition, the non-ideal properties of the modules used in the systems negatively affects the range resolution. The transmitter leakage, non-linear frequency sweep, FM to AM distortion and measurement errors are some of the critical non-ideal prop...
Downlink transmission techniques for multi user multi input multi output wireless communications Coşkun, Adem; Candan, Çağatay; Department of Electrical and Electronics Engineering (2007) Multi-user MIMO (MIMO-MU) communication techniques make use of available channel state information at the transmitter to mitigate the inter-user interference. The goal of these techniques is to provide the least interference at the mobile stations by applying a precoding operation. In this thesis a comparison of available techniques in the literature such as Channel Decomposition, SINR Balancing, Joint-MMSE optimization is presented. Novel techniques for the MIMO multi-user downlink communication systems, w...
Scheduling algorithms for wireless cdma networks Hakyemez, Serkan Ender; Schmidt, Şenan Ece; Department of Electrical and Electronics Engineering (2007) In recent years the need for multimedia packet data services in wireless networks has grown rapidly. To overcome that need third generation (3G) mobile services have been proposed. The fast growing demands multimedia services in 3G services brought the need for higher capacity. As a result of this, the improvement on throughput, traffic serving performance has become necessary in 3G systems. Code division multiple access (CDMA) technique is one of the most important 3G wireless mobile techniques that has be...
Parallel decodable channel coding implemented on a MIMO testbed Aktaş, Tuğcan; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2007) This thesis considers the real-time implementation phases of a multiple-input multiple-output (MIMO) wireless communication system. The parts which are related to the implementation detail the blocks realized on a field programmable gate array (FPGA) board and define the connections between these blocks and typical radio frequency front-end modules assisting the wireless communication. Two sides of the implemented communication testbed are discussed separately as the transmitter and the receiver parts. In a...

Citation Formats

A. Özgür, “Performance of a transmit delay scheme in digital simulcast environment,” M.S. - Master of Science, Middle East Technical University, 2004.