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This ebook introduces the reader to the idea that of an independent software-defined radio (SDR) receiver. every one distinctive point of the layout of the receiver is taken care of in a separate bankruptcy written by way of a number of prime innovators within the box. Chapters commence with an issue assertion after which supply an entire mathematical derivation of a suitable resolution, a choice metric or loop-structure as acceptable, and function effects.
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Additional info for Autonomous software-defined radio receivers for deep space applications
Finally, an adaptive algorithm based on the modiﬁed SSME was developed that allows the system to automatically converge on the true SNR, starting with an initial guess (estimate) derived from a partition of two subdivisions. 4 Frequency Tracking We present a robust frequency-tracking loop for a residual-carrier system that is capable of tracking the oﬀset frequency without knowledge of received SNR. The proposed frequency-tracking loop can operate robustly not only over an AWGN channel but also over a Rayleigh fading channel.
A critical issue with this approach is the impact of the AGC on the operation of the ADC as well as the internal digital arithmetic implemented in the FPGA. Ideally the input ADC voltage is scaled to achieve an optimal trade-oﬀ between ADC quantization noise and clipping distortion. In contrast, the AGC loop attempts to maintain the complex magnitude of the CTL arm-ﬁlter outputs to be unity on average. Thus, there is no guarantee that this criterion of unity rootmean-square (rms) CTL arm-ﬁlter outputs will enable the ADC to operate at its optimal input scaling (loading) point or even prevent the ADC from saturating.
3 Estimators and Classifiers of the Autonomous Radio After identifying the proper order for the estimator modules shown in Fig. 1-3, a design for the individual modules can begin. 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.