Now showing items 1-6 of 6

  • A Simple Iterative Equalizer for Space Time Coded Multiple Antenna Systems 

    Authors:Güçlüoǧlu, Tansal
    Publisher and Date:(IEEE, 2009)
    In this paperg a simple low complexity iterative receiver for spacetime coded zSTCg transmission is proposed and the pen formance over frequencyyselective fast and quasistatic fading channels is investigatedF Simulation results show that the pery formance of the proposed structure improves with each iteraytionF Considering the practically prohibitive complexity of opytimal equalizersg the proposed iterative receiver can be more desirable in wireless systems with large number of antennasg big ...

  • Performance analysis of transmit and receive antenna selection over flat fading channels 

    The paper considers two different antenna selection schemes for space-time coded systems over flat fading channels. First we explore antenna selection at the transmitter side based on the received signal to noise ratios. We then study the joint selection of receive and transmit antennas. Both schemes assume a slowly fading channel (i.e. quasi-static fading) and require some limited feedback from the receiver to the transmitter. By computing upper bounds on the pairwise error probabilities and ...

  • Performance of space-time coded systems with transmit antenna selection 

    Authors:Güçlüoǧlu, Tansal; Duman, Tolga M.
    Publisher and Date:(IEEE, 2007)
    We deal with transmit antenna selection for space-time coded (STC) systems over multiple input multiple output (MIMO) channels. Using pairwise error probability analysis and simulation results we show that transmit antenna selection based on received power levels does not reduce the achievable diversity order for full rank STCs. Initially we prove the results for Rayleigh flat fading channels and then we state our expectations for the case of frequency selective (FS) fading. In addition to the ...

  • Performance of Stack Equalizer over Frequency Selective Fading Channels 

    Authors:Güçlüoǧlu, Tansal
    Publisher and Date:(IEEE, 2008)
    In this paper the performance of the low complexity modified stack equalizer over frequency-selective fading channels is inspected. With the help of simulation results it is illustrated that by sacrificing the computational complexity insignificantly the performance of the modified equalizer can be made closer to optimum. This equalizer can be used at the receiver of uncoded systems or bit interleaved coded systems with iterative receivers.

  • Performance of transmit and receive antenna selection in the presence of channel estimation errors 

    This letter considers the effect of channel estimation errors on the performance of space-time coded (STC) systems with transmit and receive antenna selection over quasi-static flat fading channels. By performing pairwise error probability analysis and presenting numerical examples we show that the diversity order achieved with perfect channel state information (CSI) is still achievable with imperfect CSI used both at the antenna selection and the space-time decoding processes. We note that our ...

  • Space-time coded systems with joint transmit and receive antenna selection 

    Authors:Güçlüoǧlu, Tansal; Duman, Tolga M.
    Publisher and Date:(IEEE, 2007)
    This paper studies performance of space-time coded (STC) systems with joint transmit and receive antenna selection over multiple input multiple output (MIMO) flat and frequency-selective (FS) fading channels. Specifically we first perform a pairwise error probability analysis over flat fading channels explicitly. Then we comment on our expectations for the case of FS fading channels. We show that the joint transmit and receive antenna selection based on received power levels does not degrade the ...