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Inf/Sup frequency shift scheme change to set bandwidth closer to device center frequency

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f4exb
2018-05-10 22:17:39 +02:00
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plugins/samplesource/bladerfinput/readme.md
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@@ -72,9 +72,14 @@ The I/Q stream from the BladeRF ADC is downsampled by a power of two before bein
Possible values are:
- **Cen**: the decimation operation takes place around the BladeRF Rx center frequency
- **Inf**: the decimation operation takes place around the center of the lower half of the BladeRF Rx passband.
- **Sup**: the decimation operation takes place around the center of the upper half of the BladeRF Rx passband.
- **Cen**: the decimation operation takes place around the BladeRF Rx center frequency Fs
- **Inf**: the decimation operation takes place around Fs - Fc.
- **Sup**: the decimation operation takes place around Fs + Fc.
With SR as the sample rate before decimation Fc is calculated as:
- if decimation n is 4 or lower: Fc = SR/2^(log2(n)-1). The device center frequency is on the side of the baseband. You need a RF filter bandwidth at least twice the baseband.
- if decimation n is 8 or higher: Fc = SR/n. The device center frequency is half the baseband away from the side of the baseband. You need a RF filter bandwidth at least 3 times the baseband.
<h3>7: Rx filter bandwidth</h3>