High Data Rate QAM Transmission
by Aaron Coakley and Edward Lee Advisors: Dr. In Soo Ahn and Dr. Thomas Stewart The project involves the design and implementation of high data rate
multilevel quadrature amplitude modulation (QAM) transmission utilizing
the Motorola Digital Signal Processor 56002. Quadrature Amplitude Modulation
is used to fit more information into a narrow bandwidth. Four bits were
coded into two separate voltage levels and multiplied by a cosine and sine
waves respectively. The cosine and sine waves are then summed to be transmitted
to a receiver. The receiver manipulates this data to recover the original
four bits. The first phase of the project was to simulate the operation
of the transmitter and receiver using Matlab. The next phase was to test
and implement the theory on a Motorola DSP56002 Evaluation Kit along with
a personal computer. The simplex modem would be practically applied using
two coded DSP56002 integrated chips as the transmitter and receiver. The
paper contains an explanation of QAM theory, an example of the Matlab simulation
and results, a look at the preliminary steps to implement the DSP56002
EVM kit to test the theory, and a result of the final transmitter and receiver
with coding.
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