Sökning: "Beamforming"

Visar resultat 1 - 5 av 81 avhandlingar innehållade ordet Beamforming.

  1. 1. Optimal and Adaptive Subband Beamforming

    Detta är en avhandling från Ronneby : Blekinge Institute of Technology

    Författare :Nedelko Grbic; ; [2001]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Beamforming; Optimal; Adaptive; Speech Enhancement;

    Sammanfattning : The increased use of personal communication devices, personal computers and wireless cellular telephones enables the development of new inter-personal communication systems. The merge between computers and telephony technologies brings up the demand for convenient hands-free communications. LÄS MER

  2. 2. Microwave CMOS Beamforming Transmitters

    Detta är en avhandling från Tryckeriet i E-huset, Lunds universitet

    Författare :Johan Wernehag; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Beamforming transmitter; CMOS; frequency doubling power amplifier; polyphase filter; phase shifting;

    Sammanfattning : The increase of the consumer electronics market the last couple of decades has been one of the main drivers of IC process technology development. The majority of the ICs are used in digital applications, and for these CMOS is the choice of technology. The urge to squeeze more transistors on to a given area has led to shrinking feature sizes. LÄS MER

  3. 3. Micro- and Millimeter Wave CMOS Beamforming Receivers

    Detta är en avhandling från Tryckeriet i E-huset, Lunds universitet

    Författare :Andreas Axholt; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; beamforming; CMOS; front-end; microwave; millimeter wave; phase-locked loop; phased-array;

    Sammanfattning : The available bandwidth in wireless communication systems, such as the 802.11 family, is very limited. Together with the ever increasing data traffic, this causes problems. New possibilities are, however, available thanks to wide license-free bandwidth allocated at higher frequencies. LÄS MER

  4. 4. Subband Beamforming for Speech Enhancement in Hands-Free Communication

    Detta är en avhandling från Karlskrona : Blekinge Institute of Technology

    Författare :Zohra Yermeche; ; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Beamforming; Speech enhancement; Subband filtering;

    Sammanfattning : Speech enhancement by means of microphone array signal processing has a major role in voice communication applications such as audio-conferencing, hands-free telephony, voice recognition and hearing aids. In these communication scenarios, the speaker is positioned at a remote distance from the microphones, which causes problems of environment noise and interfering sound corrupting the received speech. LÄS MER

  5. 5. Direction finding, beamforming and mutual coupling in base station antenna arrays

    Detta är en avhandling från Karlskrona : Blekinge Institute of Technology

    Författare :Staffan Lundgren; [1998]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mutual coupling; adaptive arrays; direction finding; base station antennas; mobile communications; phase-only nulling; beamforming; dual polarization; butler matrix;

    Sammanfattning : .... LÄS MER