Computationally efficient design for broadcast satellite single wire and/or direct demod interface
View Patent ↗A broadcast satellite single wire interface comprises a low noise block amplifier module having multiple outputs, a plurality of filter banks, each filter bank coupled to each of the outputs of the low noise block amplifier module in a respective fashion and comprising a plurality of filters, and a plurality of analog-to-digital (A/D) converters, each A/D converter coupled to a filter in the plurality of filters in the plurality of filter banks in a respective fashion, wherein the A/D converters directly sample incoming downconverted broadcast satellite signals and the sampled incoming downconverted broadcast signals are output on a single wire in a stacked output.
1. A system comprising:
a plurality of amplifiers, each of the plurality of amplifiers for amplifying one of a plurality of signals received from a respective one of a plurality of transponders, the plurality of signals having L carriers;
a network, coupled to the plurality of amplifiers, for frequency-translating each of the amplified signals into a frequency-translated signal;
a plurality of analog-to-digital (A/D) converters, wherein each A/D converter is communicatively coupled to receive a respective frequency-translated signal;
a plurality of filters for channelizing the output of the plurality of A/D converters into a plurality of channelized signals, wherein the plurality of filters comprises L′ filters, wherein L′>L and L′ is a plurality of two; and
a combiner, coupled to outputs of the filters, for combining selected ones of the plurality of channelized signals into a stacked output.
2. The system of claim 1 , wherein:
the network frequency-translates each of the amplified signals into a frequency-translated signal having the first bandwidth and an adjustable starting frequency;
a sampling frequency of the A/D converters is adjustable; and
the starting frequency and the sampling frequency are adjusted to accommodate non-uniform channel spacing of the transponders.
3. The system of claim 1 , wherein each of the frequency-translated signals comprises a first bandwidth and the plurality of filters comprises a plurality of polyphase bandpass filters, each having a passband bandwidth subdividing the first bandwidth, wherein each polyphase bandpass filter comprises a plurality of parallel uniformly spaced filters.
4. The system of claim 3 , wherein the bandwidth of the plurality of polyphase bandpass filters overlap.
5. The system of claim 4 , wherein a plurality of stacked outputs are present.
6. The system of claim 5 , wherein at least one of the plurality of stacked outputs is an In-phase/Quadrature phase (I/Q) near-baseband output.
7. The system of claim 1 , wherein the signals received from the plurality of transponders comprise L signals and the plurality of filters channelizes the output of the plurality of A/D converters into L′ stacked channelized signals.
8. The system of claim 4 , wherein each polyphase bandpass filter comprises a different number of parallel uniformly spaced filters.