Sökning: "radio base station receiver"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden radio base station receiver.

1. 1. GaN HEMT Low Noise Amplifiers for Radio Base Station Receivers

   Författare :Pirooz Chehrenegar; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gallium nitride GaN ; radio base station receiver; cascode; high linearity; robustness.; cascade; high electron mobility transistor HEMT ; low noise; low noise amplifier;

   Sammanfattning : Gallium nitride (GaN) high electron mobility transistor (HEMT) has been introduced as the technology of choice for high power microwave applications due to its material properties including high saturation electron velocity and breakdown field together with excellent thermal conductivity and robustness.It is also a promising candidate for receiver front-ends in the radio base station(RBS) where low noise figure and high linearity are key issues for low noiseamplifier (LNA) design. LÄS MER

3. 2. Analysis of Radio Channel Measurements Using Multiple Base Stations

   Författare :Niklas Jaldén; Björn Ottersten; Bo Göransson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Channel Modellin; Telecommunication; Telekommunikation;

   Sammanfattning : Future wireless communication systems will utilize the spatial properties of the wireless channel to improve the spectral efficiency and thus increase capacity. This is realized by deploying multiple antennas at both the transmitter and receiver. LÄS MER

4. 3. Single-User Receivers for Partly Known Interference in Multi-User Environments

   Författare :Bo Hagerman; Jens Zander; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cellular systems; mobile radio systems; co-channel interference; inter-cell interference; interference adaptive receiver; macrocells; microcells; Information technology; Informationsteknik; SRA - ICT; SRA - Informations- och kommunikationsteknik;

   Sammanfattning : In multiuser environments such as cellular radio systems, the limited available bandwidth is one of the principal design constraints. For future high subscriber density systems, frequency reuse is one of the fundamental approaches for efficient spectrum utilization in order to meet the increased demands for capacity. LÄS MER

5. 4. Iterative receivers with channel estimation for MIMO and multi-user OFDM systems

   Författare :Peter Hammarberg; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Iterative receiver; channel estimation; multi-user detection; OFDM; MIMO; IDMA; complexity; EXIT chart; channel measurements.;

   Sammanfattning : The traffic in wireless networks has been showing an exponential growth over the last decade. In order to meet the demand, and support a continuation of this growth, the scarce radio resources need to be efficiently used. LÄS MER

7. 5. Channel Related Optimization of Wireless Communication Systems

   Författare :Fredrik Tufvesson; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; time division duplex; multicarrier; Radio communication; orthogonal frequency division multiplex; channel estimation; pilot symbol assisted modulation; sub-channel spacing; sub-channel bandwidth; interchannel interference; cyclic prefix; intersymbol interference; Rayleigh fading; precoding; pre-compensation;

   Sammanfattning : This thesis deals with different optimization problems in the design of wireless communication systems. It is mainly directed to the design of systems based on multicarrier techniques and orthogonal frequency division multiplex, OFDM, but some of the problems apply to single carrier systems as well. LÄS MER