Autonomous Software-Defined Radio Receivers for Deep Space by J. Hamkins, et al.,

By J. Hamkins, et al.,

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10] J. G. , 1995. [11] G. Ungerboeck, “Channel Coding with Multilevel/Phase Signals,” IEEE Transactions on Information Theory, vol. IT-28, pp. 55–67, January 1982. [12] S. W. Asmar, “Characteristic Trends of Ultrastable Oscillators for Radio Science Experiments,” The Telecommunications and Data Acquisition Progress Report 42-129, January–March 1997, Jet Propulsion Laboratory, Pasadena, California, pp. 1–5, May 15, 1997. pdf [13] S. Hinedi, “A Functional Description of the Advanced Receiver,” The Telecommunications and Data Acquisition Progress Report 42-100, October– December 1989, Jet Propulsion Laboratory, Pasadena, California, pp.

The constant is pre-computed as a function of data rate and is programmed into the FPGA. The next stage of the DTTL contains a set of integrators. Each integrator is designed to integrate the symbol level over a different segment of the symbol period. Since the window size of this DTTL is 1/2 a symbol, four integrators must be used. Two of them are used for detecting symbol transitions at symbol boundaries, and two are used for the mid-symbol boundaries. The timing of these integrators is controlled by the DTTL timing logic.

At first glance, it may seem that some of these estimator modules are simply long-established, conventional designs. For example, phase-tracking loops have been designed and analyzed for nearly every reasonable signal type. However, the authors were unable to find any literature for the design of a phase-tracking loop for suppressedcarrier signals in which the modulation type is unknown. A loop is needed that works adequately for any phase-modulated signal, and which can improve its performance by later taking input from the modulation classifier when it starts producing an output.

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