By Jon Hamkins, Marvin K. Simon, Joseph H. Yuen
This ebook introduces the reader to the concept that of an self sufficient software-defined radio (SDR) receiver. every one designated point of the layout of the receiver is taken care of in a separate bankruptcy written by means of a number of prime innovators within the box. Chapters commence with an issue assertion after which supply a whole mathematical derivation of an acceptable answer, a call metric or loop-structure as applicable, and function effects.
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Extra resources for Autonomous software-defined radio receivers for deep space applications
We brieﬂy summarize the status of the design and analysis of some of these estimators below. 1 Carrier Phase Tracking In autonomous radio operation, it is desired that the receiver contain a carriersynchronization structure that is generic in the sense that it is capable of tracking the carrier phase independently of the modulation. If the modulation is restricted to the M -PSK class, then it is possible to construct a universal structure that performs the carrier-synchronization function for all values of M .
Using conventional estimation and tracking designs, one quickly gets into a chicken and egg problem, with nearly every estimator needing the output of the other estimators before it can make a maximum-likelihood (ML) estimate. To resolve this problem, we have arranged the estimators/classiﬁers in the partially ordered set shown in Fig. 1-3, which deﬁnes the order in which they may be operated, at least sub-optimally, during the ﬁrst iteration of estimation. Details about the order of estimation and the interaction of the estimators in the ﬁrst and subsequent iterations are discussed in Chapter 11.
1 AGC The AGC controls the voltage level input to the ADC based on a control voltage signal generated digitally in the FPGA. In particular, the AGC is based on a single feedback control loop design with the AGC control voltage extending back from the carrier-tracking loop (CTL) arm-ﬁlter outputs, as indicated in Fig. 2-2. The digital AGC error signal, EAGC , is generated from the CTL armﬁlter outputs, I and Q, via EAGC = Kgain · (1 − I 2 + Q2 ) (2 1) where Kgain controls the time constant of the AGC as well as the variance of the resulting amplitude gain estimate.