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35222296fe
Introduce polyphase channelizer (Rx) and synthesis (Tx) filterbanks, which serve as the signal processing backend for multi-carrier GSM. Fast Fourier Transform (FFT) is used internally. FFTW is added as a new build dependency. Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
#ifndef _SYNTHESIS_H_
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#define _SYNTHESIS_H_
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#include "ChannelizerBase.h"
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class Synthesis : public ChannelizerBase {
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public:
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/** Constructor for synthesis filterbank
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@param m number of physical channels
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@param blockLen number of samples per output of each iteration
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@param hLen number of taps in each constituent filter path
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*/
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Synthesis(size_t m, size_t blockLen, size_t hLen = 16);
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~Synthesis();
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/* Return required input and output buffer lengths */
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size_t inputLen() const;
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size_t outputLen() const;
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/** Rotate "output commutator" and drive samples through filterbank
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@param out complex output vector
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@param oLen number of samples in buffer (must match block length * m)
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@return false on error and true otherwise
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*/
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bool rotate(float *out, size_t oLen);
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/** Get buffer for an input path
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@param chan channel number of filterbank
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@return NULL on error and pointer to buffer otherwise
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*/
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float *inputBuffer(size_t chan) const;
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bool resetBuffer(size_t chan);
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};
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#endif /* _SYNTHESIS_H_ */
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