Sökning: "Orthogonal codes"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden Orthogonal codes.

  1. 1. Performance Analysis of a MIMO Cognitive Cooperative Radio Network with Multiple AF Relays

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

    Författare :Advaita Advaita; Mani Meghala Gali; [2016]
    Nyckelord :Cognitive radio; Cooperative communications; Space time coding; MIMO systems; Outage probability;

    Sammanfattning : With the rapid growth of wireless communications, the demand for the various multimedia services is increasing day by day leading to a deficit in the frequency spectrum resources. To overcome this problem, the concept of cognitive radio technology has been proposed which allows the unlicensed secondary user (SU) to access the licensed spectrum of the primary user (PU), thus improving the spectrum utilization. LÄS MER

  3. 2. Robust MIMO Precoding on Real-World Measured Channels

    Master-uppsats, KTH/Signalbehandling

    Författare :Filip Hedenskog; [2015]
    Nyckelord :MIMO; maximin; imperfect CSIT; real-world measured channels; uncertainty set; worst-case robustness;

    Sammanfattning : It is well known that multi-input multi-output (MIMO) wireless communication systemsthat employ precoding techniques are capable of meeting the high expectations of modernand future wireless communication standards. In order to fully utilize these techniques, thecommunication system typically requires information of the channel, commonly referred toas channel state information (CSI). LÄS MER

  4. 3. Performance Evaluation of Error Correcting Techniques for OFDM Systems

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för kommunikationssystem

    Författare :Yasir Javed Qazi; Jawad Ahmed Malik; Safwan Muhammad; [2014]
    Nyckelord :OFDM; Linear block codes; Convolution codes; Reed-Solomon codes;

    Sammanfattning : Orthogonal frequency-division multiplexing (OFDM) systems provide efficient spectral usage by allowing overlapping in the frequency domain. Additionally, they are highly immune to multipath delay spread. LÄS MER

  5. 4. Low complexity algorithms for faster-than-Nyquistsign : Using coding to avoid an NP-hard problem

    Master-uppsats, KTH/Optimeringslära och systemteori

    Författare :Emil Ringh; [2013]
    Nyckelord :;

    Sammanfattning : This thesis is an investigation of what happens when communication links are pushed towards their limits and the data-bearing-pulses are packed tighter in time than previously done. This is called faster-than-Nyquist (FTN) signaling and it will violate the Nyquist inter-symbol interference criterion, implying that the data-pulsesare no longer orthogonal and thus that the samples at the receiver will be dependent on more than one of the transmitted symbols. LÄS MER

  7. 5. Performance Analysis of Decode and Forward Relaying with Keyhole in Nakagami-m Fading Channels

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för datalogi och datorsystemteknik

    Författare :pawan khadka; [2012]
    Nyckelord :decode and forward; orthogonal space time block codes; Nakagami-m fading; keyhole effects; symbol error rate; moment generating function; fading severity parameter;

    Sammanfattning : Fading has always been a major obstacle in the effective transmission of signals from the transmit antenna to the receive antenna. The innovation of multiple-input multiple-output (MIMO) system has led to the regression of the adverse effect of these fading entities and thus provided a higher data rate communication while maintaining the quality of service (QoS). LÄS MER