Download Digital Radio System Design by Grigorios Kalivas PDF

By Grigorios Kalivas

A scientific clarification of the foundations of radio platforms, electronic Radio method layout deals a balanced remedy of either electronic transceiver modems and RF front-end subsystems and circuits. It presents an in-depth exam of the full transceiver chain which is helping to attach the 2 issues in a unified method idea. even if the booklet tackles such varied fields it treats them in adequate intensity to provide the fashion designer an effective origin and an implementation standpoint. overlaying the foremost suggestions and elements that characterise and impression radio transmission and reception, the ebook offers issues equivalent to receiver layout, noise and distortion. info is supplied approximately extra complicated points of approach layout corresponding to implementation losses as a result of non-idealities. offering bright examples, illustrations and designated case-studies, this publication is a perfect advent to electronic radio platforms layout.

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26 shows the fundamental and IP3 curves along with the noise floor. Point A is the point representing the strongest allowable signal and consequently DR is equal to the length AB. 157) For example, a GSM-900 system has a bandwidth of 200 kHz and requires an SNR of 9 dB. 7 dB. 2 Link Budget and its Effect on the Receiver Design Link budget refers to the analysis and calculation of all factors in the transceiver system in order to ensure that the SNR at the input of the digital demodulator is adequate for achieving satisfactory receiver performance according to the requirements of the application.

34) To obtain the lowpass complex envelope signal xLP (t) from x(t), the term jA(t) sin [2πfC t + θ(t)] must be added to the passband signal x(t) and the carrier must be removed by multiplying by exp (−2πfC t). 4. 36) From the above we realize that the Hilbert transform is a simple filter which shifts by −π/2 the phase of the positive frequencies and by +π/2 the phase of the negative frequencies. 5 Lowpass nature of the PSDs SXI ( f ), SXQ ( f ) of quadrature components xI (t), xQ (t) If XN (t) is a stationary bandpass process of zero mean, processes XnI (t) and XnQ (t) are also zero mean [Proakis02].

The noise figure (NF) or noise factor (F) of a circuit (or system) along the receiver is defined as the amount by which SNR deteriorates when passing through it. 147) The noise figure is given by NF = 10 log (F). 23(a) shows a two-port network including all noise sources, which is used to find a suitable expression for the noise factor. 148) We assume that the voltage gain is A1 from point IN to point P and A2 from point P to the output. The input SNR is measured at point P and is equal to the ratio of signal power produced 42 Digital Radio System Design by an input signal of amplitude Vin to the noise due to the source resistance RS .

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