Capacity-based Parameter Optimization of Bandwidth Constrained CPM.

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ProQuest, 2007 - 175 pages
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Continuous phase modulation (CPM) is an attractive modulation choice for bandwidth limited systems due to its small side lobes, fast spectral decay and the ability to be noncoherently detected. Furthermore, the constant envelope property of CPM permits highly power efficient amplification. The design of bit-interleaved coded continuous phase modulation is characterized by the code rate, modulation order, modulation index, and pulse shape. This dissertation outlines a methodology for determining the optimal values of these parameters under bandwidth and receiver complexity constraints. The cost function used to drive the optimization is the information-theoretic minimum ratio of energy-per-bit to noise-spectral density found by evaluating the constrained channel capacity. The capacity can be reliably estimated using Monte Carlo integration. A search for optimal parameters is conducted over a range of coded CPM parameters, bandwidth efficiencies, and channels. Results are presented for a system employing a trellis-based coherent detector. To constrain complexity and allow any modulation index to be considered, a soft output differential phase detector has also been developed.
 

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Contents

Channel Coding for Modern Communication Systems
15
Modulation for Bandwidth Limited Systems
40
Detector Designs For CPM
59
Mutual Information as a Performance Measure
87
Optimization Results for BitInterleaved Coded CPM
108
Conclusion
135
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