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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>
40 lines
843 B
C++
40 lines
843 B
C++
#ifndef _CHANNELIZER_BASE_H_
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#define _CHANNELIZER_BASE_H_
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class ChannelizerBase {
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protected:
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ChannelizerBase(size_t m, size_t blockLen, size_t hLen);
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~ChannelizerBase();
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/* Channelizer parameters */
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size_t m;
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size_t hLen;
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size_t blockLen;
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/* Channelizer filterbank sub-filters */
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float **subFilters;
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/* Input/Output buffers */
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float **hInputs, **hOutputs, **hist;
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float *fftInput, *fftOutput;
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/* Pointer to opaque FFT instance */
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struct fft_hdl *fftHandle;
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/* Initializer internals */
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bool initFilters();
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bool initFFT();
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void releaseFilters();
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/* Map overlapped FFT and filter I/O buffers */
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bool mapBuffers();
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/* Buffer length validity checking */
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bool checkLen(size_t innerLen, size_t outerLen);
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public:
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/* Initilize channelizer/synthesis filter internals */
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bool init();
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};
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#endif /* _CHANNELIZER_BASE_H_ */
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