Reconfigurable wideband channelized receiver

An apparatus for sampling a wideband analog signal comprising:

• a plurality of splitters for splitting the wideband analog signal into N parallel channels, where N is an integer;
• a plurality of demodulators for randomly demodulating each of the signals in N parallel channels with non-identical pseudo-random binary spreading codes to uniquely demodulate each of the signals in each N parallel channels;
• a plurality of samplers for sampling each randomly demodulated signal using a sub-Nyquist sampling rate;
• a first combiner for combining each sampled signal into a sub-Nyquist digitized random demodulated signal;
• a compressive sensor for compressive sensing the combined sub-Nyquist digitized random demodulated signal to estimate missing samples of a full Nyquist rate uniform sample set X(n);
• a plurality of analysis filters for convolving the uniform sample set X(n) to break the X(n) signal into N sub-bands channels, each analysis filter having a different coefficient;
• a plurality of decimators for decimating output of each analysis filter using decimation ratios of M:1 to generate a sub-banded signal set Yi (n), i=1, . . . , N, where M is an integer less than or equal to N;
• a processor for processing the sub-banded signal set;
• a plurality of up-samplers for up-sampling each processed sub-band signal by M;
• a plurality of synthesis filters for convolving each up-sampled sub-band signal with a corresponding synthesis filter;
• and
• a second combiner for combining two or more of the convolved signals to generate a non-uniform spectral partitioning of the wideband analog signal.

A method for sampling a wideband analog signal, the method comprising:

• receiving the wideband analog signal;
• splitting the received wideband analog signal into N parallel channels, where N is an integer;
• randomly demodulating each of the signals in N parallel channels with non-identical pseudo-random binary spreading codes to uniquely demodulate each of the signals in each N parallel channels;
• sampling each randomly demodulated signal using a sub-Nyquist sampling rate;
• combining each sampled signal into a sub-Nyquist digitized random demodulated signal;
• compressive sensing the combined sub-Nyquist digitized random demodulated signal to estimate missing samples of a full Nyquist rate uniform sample set X(n);
• sequentially delaying X(n) with N identical first delays to generate N delayed signals;
• decimating each of the N delayed signals by M, where M is an integer less than or equal to N;
• filtering each of the N decimated signals by N corresponding identical filters;
• performing a Fast Fourier Transform (FFT) on the N filtered signals;
• processing outputs of the FFT;
• performing an inverse Fast Fourier Transform (IFFT) on the processed signals;
• filtering outputs of the IFFT to generate N filtered signals;
• up-sampling each filtered signal;
• sequentially delaying each up-sampled signal with N identical second delays;
• and
• combining two or more of the delayed up-sampled signals to generate a non-uniform spectral partitioning of the wideband analog signal.

An apparatus for sampling a wideband analog signal comprising:

• a plurality of splitter for splitting the wideband analog signal into N parallel channels, where N is an integer;
• a plurality of demodulators for randomly demodulating each of the signals in N parallel channels with non-identical pseudo-random binary spreading codes to uniquely demodulate each of the signals in each N parallel channels;
• a plurality of samplers for sampling each randomly demodulated signal using a sub-Nyquist sampling rate;
• a first combiner for combining each sampled signal into a sub-Nyquist digitized random demodulated signal;
• a compressive sensor for compressive sensing the combined sub-Nyquist digitized random demodulated signal to estimate missing samples of a full Nyquist rate uniform sample set X(n);
• a first tab delay line including N identical first delays for sequentially delaying X(n) to generate N delayed signals;
• a plurality of decimators for decimating each of the N delayed signals by M, where M is an integer less than or equal to N;
• a plurality of analysis filters for filtering each of the N decimated signals;
• a Fast Fourier Transform (FFT) module for performing an FFT on the N filtered signals;
• a processor for processing outputs of the FFT;
• an Inverse Fast Fourier Transform (IFFT) module for performing an IFFT on the processed signals;
• a plurality of synthesis filters for filtering outputs of the IFFT to generate N filtered signals;
• a plurality of up-samplers for up-sampling each filtered signal;
• a second tab delay line including N second delays for sequentially delaying each up-sampled signal;
• and
• a second combiner for combining two or more of the delayed up-sampled signals to generate a non-uniform spectral partitioning of the wideband analog signal.