Sökning: "radio series"

Visar resultat 31 - 35 av 97 avhandlingar innehållade orden radio series.

  1. 31. Secondary Electromagnetic Radiation Generated by HF Pumping of the Ionosphere

    Författare :Lars Norin; Bo Thidé; Savely M. Grach; Bengt Gustafsson; James W. LaBelle; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; space physics; ionospheric modification experiments; plasma turbulence; stimulated electromagnetic emission; ionospheric irregularities; radio waves; parametric processes; thermal parametric instability; transient dynamics; wave-wave interactions; Physics; Fysik;

    Sammanfattning : Electromagnetic waves can be used to transmit information over long distances and are therefore often employed for communication purposes. The electromagnetic waves are reflected off material objects on their paths and interact with the medium through which they propagate. LÄS MER

  3. 32. Predictive and prognostic factors in cervical carcinomas treated with (chemo-) radiotherapy

    Författare :Louise Bohr Mordhorst; Bengt Sorbe; Preben Kjölhede; Örebro universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; cervical carcinoma; radio-chemotherapy; biomarkers; predictive factors; prognostic factors; multiprotein analysis; Hedgehog pathway; Wnt β-catenin pathway; Surgery; Kirurgi;

    Sammanfattning : A series of 131 women with cervical carcinoma FIGO stage I-IV were treated with external radiotherapy and intracavitary brachytherapy. In 47 patients (36%) concomitant chemotherapy was given. One hundred and twenty-one tumors (92%) achieved complete remission. Addition of chemotherapy increased primary cure rate to 98%. LÄS MER

  4. 33. Characterization and Compensation of Hardware Impairments in Transmitters for Wireless Communications

    Författare :Zain Ahmed Khan; Peter Händel; Magnus Isaksson; Mikko Valkama; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power amplifier; RF transmitters; SISO; MIMO; crosstalk; Volterra series; Volterra kernels; behavioral modeling; DPD; Ramanujan sums; multitone signals; I Q Imbalance; non-linearity; memory polynomial; density estimation; hardware impairments; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Increasing demands for data rate, energy efficiency and reliability in wireless communications have resulted in the introduction of radio frequency (RF) multiple input multiple output (MIMO) transmitters. However, MIMO transmitters suffer from additional crosstalk impairments along with the power amplifier (PA) and I/Q imbalance distortions observed in single input single output (SISO) transmitters. LÄS MER

  5. 34. Antenna array mapping for DOA estimation in radio signal reconnaissance

    Författare :Per Hyberg; Björn Ottersten; Alex Gershman; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Array mapping; array interpolation; Signalbehandling; Signal processing; Signalbehandling;

    Sammanfattning : To counter radio signal reconnaissance, an efficient way of covert communication is to use subsecond duration burst transmissions in the congested HF band. Against this background, the present thesis treats fast direction finding (DF) using antenna arrays with known response only in a few calibration directions. LÄS MER

  7. 35. Towards intuitive interfaces

    Författare :Otto Carlander; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Radio Communication; Fighter Jet; Tactile; Combat Vehicle; Multimodal; Command Operators; 3D audio;

    Sammanfattning : Operators like fighter pilots, combat vehicle drivers and fire and rescue command operators handle considerable amount of information during mission critical activities. The increasing complexity of the information landscape calls for alternative information presentation. LÄS MER