Search for dissertations about: "multiuser communication"

Showing result 21 - 25 of 37 swedish dissertations containing the words multiuser communication.

  2. 21. Superconductor Digital Signal Processor

    Author : Irina Kataeva; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rapid Single Flux Quantum logic RSFQ ; multiuser detector; VHDL; Multiply-Accumulate Unit; Successive Interference Canceller;

    Abstract : Superconductor digital technology based on Rapid Single Flux Quantum logic (RSFQ) offers more than 50 times gain in speed and more than 100 reduction in power consumption over mainstream CMOS devices. However, the necessity of cooling down to 4 K and modest degree of integration density currently available mean that employing RSFQ is reasonable only for the tasks that are impossible or ineffective to implement in CMOS technology. READ MORE

  4. 22. Channel Estimation and Receiver Design in Single- and Multiuser Multiantenna Systems : Dissertation Submitted for the Degree of Doctor of the Hungarian Academy of Sciences

    Author : Gabor Fodor; Ericsson Research; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multiple antenna systems; estimation theory; stochastic modeling; Electrical Engineering; Elektro- och systemteknik; Telecommunication; Telekommunikation;

    Abstract : As an engineer and researcher, I have been dealing with the research, standardization and industrial-ization of wireless communication systems since the late 90’s. Specifically, I have been witnessing andcontributing to the evolution of the 3rd, 4th and currently to the 5th generation of cellular networks. READ MORE

  5. 23. Muliple-access techniques for adaptive wireless systems

    Author : Wei Wang; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : With the growing demand for mobile content, the roles of mobile handsets have started shifting from merely communication tools to multi-media channels. This trend will push the current 3G/UMTS networks towards higher throughput, mobility and connectivity. READ MORE

  6. 24. Cross-layer Aspects in OFMDA Systems : Feedback, Scheduling and Beamforming

    Author : Patrick Svedman; Björn Ottersten; Ana I. Pérez-Neira; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

    Abstract : This thesis mainly studies the downlink of a wireless multiuser system, where the transmitter has limited knowledge about the communication channels of the users. Key techniques to improve the performance of such systems are, for instance, multiple antennas, multiuser diversity and orthogonal frequency-division multiple access (OFDMA). READ MORE

  7. 25. Synchronization and channel estimation in OFDM systems

    Author : Jaap van de Beek; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

    Abstract : This thesis addresses synchronization and channel estimation in OFDM communication systems. The joint maximum likliehood estimator of symbol time and carrier frequency offsets for OFDM systems using a cyclic prefix is presented. This estimator exploits the redundancy introduced by the prefix and does not require extra pilot information. READ MORE