Sökning: "Rayleigh Fading"

Visar resultat 16 - 20 av 54 uppsatser innehållade orden Rayleigh Fading.

  1. 16. Comparison and Evaluation of Doppler Spread Estimation Algorithms in WCDMA

    Master-uppsats, KTH/Kommunikationsteori

    Författare :Hui Wen; [2014]
    Nyckelord :;

    Sammanfattning : In a WCDMA transmission systems, the properties of the radio transmissionchannels can be strongly aected by the movement of User Equipment (UE) orthe surrounding objects. The estimation of Doppler spread is therefore of greatimportance since it is closely related to the mobile speed, as it can also be usedto characterize the fast fading in the radio channel. LÄS MER

  3. 17. Performance and Complexity Comparison of Doppler Spread Estimation for WCDMA Systems

    Master-uppsats, KTH/Kommunikationsteori

    Författare :Ziqi Peng; [2014]
    Nyckelord :Doppler spread estimation; WCDMA uplink systems; Rayleigh fading model; Rician fading model; computational complexity.;

    Sammanfattning : In cellular communication systems, the estimation of Doppler spread has a wide range of applications such as handoff, channel assignment scheme, adaptivetransmission, power control, etc. A great quantity of Doppler spread estimation algorithms have been proposed in the literature. LÄS MER

  4. 18. Performance evaluation of interleaving techniques for IEEE 802.15.4 transmissions

    Kandidat-uppsats, Mittuniversitetet/Avdelningen för informations- och kommunikationssystem

    Författare :Jiahuan Lei; Qingbi Liao; [2014]
    Nyckelord :interleaving; Matlab; Reed-Solomon; TinyOS; WSN; FEC; MicaZ;

    Sammanfattning : In the wireless sensor network, the WLAN interference, multi-path fading andattenuation are the main reason for packets’ corruption. Forward errorcorrection is one of the methods for error mitigation. Many coding methods aredesigned to improve the reliability of wireless channel. LÄS MER

  5. 19. Performance Analysis of 3-hop using DAF and DF over 2-hop Relaying Protocols

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Faisal Mehmood; Muneeb Ejaz; [2013]
    Nyckelord :Bit Error Rate; Cognitive Radio; Decode Amplify and Forward; Energy Detection; Probability of Detection; Rayleigh Fading; Relay Network;

    Sammanfattning : In wireless Communication, the need of radio spectrum increases nowadays. But in the system we are losing approximately 82-86% of spectrum most of the time due to the absence of Primary User (PU). To overcome this issue Cognitive Radio (CR) is an admirable approach. LÄS MER

  7. 20. MIMO Channel Equalization and Symbol Detection using Multilayer Neural Network

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Athar Waseem; A.H.M Sadath Hossain; [2013]
    Nyckelord :MIMO; ISI; NN; SER; Channel Equalizer; QAM;

    Sammanfattning : In recent years Multiple Input Multiple Output (MIMO) systems have been employed in wireless communication systems to reach the goals of high data rate. A MIMO use multiple antennas at both transmitting and receiving ends. These antennas communicate with each other on the same frequency band and help in linearly increasing the channel capacity. LÄS MER