Multiple-input multiple-output wavelet packet modulation based software-defined radio transceiver design
Cribbs, Michael R.
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In this thesis, a software-defined radio (SDR) transmitter and receiver is developed using GNU Radio. The designed SDR multiplexes orthogonal subcarriers using wavelet packet modulation (WPM). WPM achieves subcarrier orthogonality by employing the inverse discrete wavelet packet transform (IDWPT) for the transmitter and discrete wavelet packet transform (DWPT) for the receiver. Realization concerns for the IDWPT and DWPT are discussed to allow for any desired wavelet to be utilized in these transforms. Alamouti encoding and decoding techniques are used to achieve a multiple-input multiple-output (MIMO) configuration with two transmit antennas and two receive antennas. The order in which Alamouti encoding and IDWPT algorithms are applied to the transmit data stream results in a MIMO space time and frequency block code. Quadrature phase-shift keying is used for digital modulation coding, but quadrature amplitude modulation is also readily supportable. Forward error correction is performed using built-in GNU Radio blocks that implement a rate one-half, constraint length seven convolutional code. Bit error ratio performance curves generated from software simulations are provided to illustrate the success of the developed SDR. Successful hardware testing results using universal software radio peripherals for transmitter and receiver radio frequency front-end interfaces are also presented.
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