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  • Adaptive digital transceiver for rayleigh fading channels

    Creator:
    Hughes, Jeffery R.
    Abstract:
    This thesis presents an adaptive modulation scheme using a Walsh-code modulator. The Walsh-code modulator consists of a dynamic demultiplexer and predetermined sets of orthogonal Walsh-Hadamard codes. The demultiplexer can demultiplex the input bit stream into a maximum of thirty-two sub-streams. The Walsh- Hadamard codes are used to spread the spectrum...
    Resource Type:
    Masters Thesis
    Full Text:
    plus AWGN channel. Also, mapping of the PAM signal onto a quadrature amplitude modulation (QAM

  • A wireless communications systems based on space time block coding and QAM transmission

    Creator:
    Kanivichaporn, Pichalinee
    Abstract:
    Modern applications in wireless communications systems demand the capability of high transmission rate. Engineers have to find optimum solutions to transmit the signal over fading environments. In this study, we propose the combination of space-time diversity techniques and optimum QAM constellation design, in order to further improve performance. Specifically, we...
    Resource Type:
    Masters Thesis
    Full Text:
    Quadrature Amplitude Modulation (QAM) Performance Evaluation

  • Decoding channel coded higher-order QAM signals over Gaussian and Rayleigh fading channels

    Creator:
    Yang, Yun
    Abstract:
    In modern digital communication systems, error correction codes (ECC) are widely used and play an important role. The main effect of ECCs is to reduce the transmission error caused by channel noise, thereby protecting data and increasing the quality of information transmission. In addition, high spectral efficiency is desired in...
    Resource Type:
    Masters Thesis
    Full Text:
    ) ............................................................. 10                        2.3.3.3 Quadrature Amplitude Modulation (QAM