Sökning: "orthogonal frequency-division multiplexing"

Visar resultat 16 - 20 av 45 avhandlingar innehållade orden orthogonal frequency-division multiplexing.

1. 16. Single frequency broadcasting networks

   Författare :Göran Malmgren; KTH; []
   Nyckelord :;

   Sammanfattning : An Orthogonal Frequency Division Multiplexing (OFDM) schemeallows all transmitters in a radio network to transmitidentical signals in the same frequency block, forming a socalled Single Frequency Network (SFN). By avoiding frequencyreuse, substantial improvements in bandwidth utilisation arepossible. LÄS MER

3. 17. Enhancing Radio Frequency System Performance by Digital Signal Processing

   Författare :Charles Nader; Peter Händel; Niclas Björsell; Thomas Eriksson; KTH; []
   Nyckelord :;

   Sammanfattning : In this thesis measurement systems for the purpose ofcharacterization of radio frequency power amplifiers are studied.Methods to increase the speed, accuracy, bandwidth, as well as toreduce the sampling requirements and testing cost are presented. LÄS MER

4. 18. Wireless Communication for Critical Control : Analysis and Experimental Validation

   Författare :Xiaolin Jiang; Carlo Fischione; Zhibo Pang; Ming Xiao; Preben Mogensen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Wireless communications are an essential enabler of the Industry 4.0 vision, as they have the potentiality to be deployed in scenarios where the installation of cables is impractical. LÄS MER

5. 19. Modulation and channel effects in digital communication

   Författare :Sara Sandberg; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

   Sammanfattning : This thesis investigates three possible methods to increase the performance of digital communication systems, with focus on wireless systems, by accounting for some of the channel effects that may occur. The modulation scheme plays an important role in the impact of different channel effects on system performance and this work considers both a single-carrier system and orthogonal frequency-division multiplexing (OFDM). LÄS MER

7. 20. Broadband Wireless OFDM Systems

   Författare :Maxime Flament; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; channel model; 4th Generation Wireless 4GW ; shadowing; MMIC; WLAN; scenarios; mobile data; OFDM; turbo codes; propagation; license-exempt bands; coding; 60 GHz channel; broadband wireless; interference; Virtual Cellular Network VCN ; front-end;

   Sammanfattning : While the readiness of the telecommunication market and the users' need for broadband mobile data are not currently noticeable, a set of presented megatrends and scenarios suggest that broadband mobile data access will develop quickly in the next ten years. Identification of the potential frequency bands offering cheap and trouble-free wireless infrastructure is therefore an important step towards the definition of new air interfaces. LÄS MER