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The aim of our project is to implement a quadrature phase shift keying baseband modulator and demodulator on ADSP 105. The project discuss the theory behind the qpsk techniques and implementation in electronic device.The project also discuss the software programming that controls the various aspects of the qpsk techniques. In the project we are showing how a keyboard character gets modulated in the transmitter side and how it gets demodulated in the receiver side.
For qpsk modulation the original pulse stream has to be partioned as even and odd bits according to their position.The even pulse stream shifts the phase of the cosine function by 0° or 180° consequently this produce bpsk waveform. Similarly the odd pulse stream shifts the phase of the sine function.The summation of these two orthogonal components yields the qpsk waveform.
The qpsk demodulation can be divided into three major sections. Since the incoming wave is suppressed in nature coherent detection is used. Secondly raw data is obtained by coherent multiplication and used to derive clock synchronization information. The new data is then passed through the channel filter which shape the pulse train. This shaped pulse train is then routed along with the derived clock to the data samples which outputs the demodulated data.
Qpsk has its application in almost all the fields of the digital communication. In case of mobile communication where the bandwidth efficency and less power transmission with less bit error probability is the main criterion,the qpsk finds its application.Qpsk also finds its application in under ocean communication,military and other commercial fields.
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