Chirp spread spectrum system and method

1. A radio frequency receiver for receiving an interleaved single carrier chirp spread spectrum signal based on a chirp sequence, comprising:

a demodulator configured to receive, demodulate, and digitize a modulated radio frequency (RF) signal to form a digital baseband signal; and

a signal decoder configured to:

despread the digital baseband signal by at least:

buffering signal data into blocks of L samples, L being a number of samples greater than one;

multiplying the blocks of L samples with a conjugate of the chirp sequence to form a result; and

performing a Fast Fourier Transform (FFT) on the result;

equalize data from the FFT to form N data values, N being a number of sub-channels greater than one;

transform the N data values into N demodulation symbols via an N-point inverse Fourier transform; and

decode the demodulation symbols to form codec symbols.

2. The receiver of claim 1 , wherein the signal decoder is further configured to deinterleave and convolutionally decode the codec symbols to obtain recovered information data.

3. The receiver of claim 1 , wherein symbol mapping in the radio frequency receiver is Quadrature phase-shift keying (QPSK); and

wherein the signal decoder is configured to decode the demodulation symbols to form codec symbols by at least applying Quadrature phase-shift keying (QPSK) decoding.

4. The receiver of claim 1 , wherein symbol mapping in the radio frequency receiver is Binary phase-shift keying (BPSK); and

wherein the signal decoder is configured to decode the demodulation symbols to form codec symbols by at least applying Binary phase-shift keying (BPSK) decoding.

5. The receiver of claim 1 , wherein symbol mapping in the radio frequency receiver is quadrature amplitude modulation (QAM); and

wherein the signal decoder is configured to decode the demodulation symbols to form codec symbols by at least applying quadrature amplitude modulation (QAM) decoding.

6. A radio frequency receiver for receiving an interleaved single carrier chirp spread spectrum signal based on a chirp sequence, comprising:

a demodulator configured to receive, demodulate, and digitize a modulated radio frequency (RF) signal to form a digital baseband signal; and

a signal decoder configured to:

buffer signal data from the digital baseband signal into blocks of L samples, L being a number of samples greater than one;

transform the blocks of L samples into the frequency domain using an L point FFT;

correlate the blocks of L samples in the frequency domain with a chirp signal based on the chirp sequence;

perform a Fast Fourier Transform (FFT) on the correlated blocks of L samples;

equalize data from the FFT to form N data values, N being a number of sub-channels greater than one;

transform the N data values into N demodulation symbols via an N-point inverse Fourier transform; and

decode the demodulation symbols to form codec symbols.

7. The receiver of claim 6 , wherein the signal decoder is further configured to deinterleave and convolutionally decode the codec symbols to obtain recovered information data.

8. The receiver of claim 6 , wherein symbol mapping in the radio frequency receiver is Quadrature phase-shift keying (QPSK); and

wherein the signal decoder is configured to decode the demodulation symbols to form codec symbols by at least applying Quadrature phase-shift keying (QPSK) decoding.

9. The receiver of claim 6 , wherein symbol mapping in the radio frequency receiver is Binary phase-shift keying (BPSK); and

wherein the signal decoder is configured to decode the demodulation symbols to form codec symbols by at least applying Binary phase-shift keying (BPSK) decoding.

10. The receiver of claim 6 , wherein symbol mapping in the radio frequency receiver is quadrature amplitude modulation (QAM); and

wherein the signal decoder is configured to decode the demodulation symbols to form codec symbols by at least applying quadrature amplitude modulation (QAM) decoding.