MATLAB: RTL-SDR Receiver Gains

rtl-sdrsimulink

I am working through a book (see first attachment) and have come across a SIMULINK model of a receiver – second attachment. In this model you will see an RF gain of 50 dB and another gain MHz of 1e6.

Is this related to gain bandwidth product i.e. gain of 50 dB upto 1 MHz ?

Best Answer

The gain 50 dB is Receiver gain and 100MHz is the center frequency. The center frequency of a channel is measure of center frequency between upper and lower cutoff frequencies.It is usually defined as either the arithmetic mean or the geometric mean of the lower cutoff frequency and the upper cutoff frequency.

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MATLAB: Changing the LO frequency of ad9361_RX block in ad9361_QPSK testbench model causes unexpected behavior

If you change both the LO and the RF center frequency in the ad9361_RX block, you will notice very minor differences. The RF center frequency of the RX should the same as the TX LO center frequency. The input signal to the RX is a complex equivalent baseband signal, and the RF center frequency of the RX defines the RF center frequency of the incoming signal.

The LO RX center frequency should be close (within the simulation bandwidth) to the RF center frequency. This is described in the support package documentation. To access this, please type the following command at the Command Window -

open(ad93xx_getdoc)

If you set the TX LO frequency at 2 GHz, the RX RF frequency at 2GHz, and the LO center frequency at 1GHz, results will be incorrect.

MATLAB: Which mixer (Circuit Envelop/ Idealized baseband/ Equivalent Baseband from SimRF blocksets) is best suited for single carrier frequency input with imperfections such as noise/clipping in SimRF 3.2 (R2012a)

Idealized baseband mixer has built-in frequency-dependent phase noise. It might be simpler to use for a single-frequency system with a known phase noise model.

Equivalent Baseband mixer is more general, because it allows the arbitrary oscillator signal (see, for example, the phase noise block in the 'simrf_low_if' demo). The "phase noise" block is used as a noisy oscillator to the two mixers in Hartley Receiver.

With respect to circuit envelope mixer, the closest demo which will explain more is 'simrf_friis'. There you can see the simple chain, where the signal is downconverted by a mixer and a noiseless oscillator.

Idealized baseband mixer would be more suited with respect to single frequency system.

Best Answer

Related Solutions

MATLAB: Changing the LO frequency of ad9361_RX block in ad9361_QPSK testbench model causes unexpected behavior

MATLAB: Which mixer (Circuit Envelop/ Idealized baseband/ Equivalent Baseband from SimRF blocksets) is best suited for single carrier frequency input with imperfections such as noise/clipping in SimRF 3.2 (R2012a)

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