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This ebook introduces the reader to the concept that of an self sufficient software-defined radio (SDR) receiver. every one precise element of the layout of the receiver is taken care of in a separate bankruptcy written by way of a number of top innovators within the box. Chapters start with an issue assertion after which provide a whole mathematical derivation of a suitable resolution, a call metric or loop-structure as acceptable, and function effects.
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Extra info for Autonomous Software-Defined Radio Receivers for Deep Space Applications (JPL Deep-Space Communications and Navigation Series)
The most convenient form for use in the autonomous radio application is its simplification based on low SNR approximations applied to the nonlinearities inherent in the MAP phase estimate. When this is done, the error signal in the loop for M-PSK is of the form sin(M$), where $ is the phase error, which from Introduction and Overview 13 simple trigonometry can be written as sin(M+) = 2 sin[(M/2)+] cos[(M/2)+]. Thus, it is seen that the error signal in the loop for M-PSK is formed from the product of the error signal sin[(M/2)+] and the lock detector signal cos[(M/2)+] in the loop for (M/2)-PSK modulation.
A space-qualified RF design has been developed through proper selection of parts. The functionality of the digital portion of the Electra transceiver is exhibited in the block diagram presented in Fig. 2-1. Emphasis in this chapter will be focused primarily on the programmable digital portions of the Electra transceiver (receiver and digital modulator). The programmable digital receiver front-end processing is described in Section 2-1, and the Electra data demodulator is discussed in Section 2-2.
Both the real and imaginary signals are filtered by a pair of identical lowpass arm filters, G ( f ) ,with a programmable cut-off frequency. After the arm filters, one or both of the arm filter outputs is used to form the input to the loop filter, F ( f ) , depending on whether the tracking loop is operated in the suppressed-carrier- (Costas) or the residual-carrier-tracking mode (labeled PLL mode in Fig. 2-4). There are three switches (SWs) in the CTL. SW1 and SW2 are selected depending on whether the loop is operated in the Costas loop or the residual-carrier-tracking mode.