Signal detection method for non-coherent detection in a chirp spread spectrum communication system

A communication signal detection method for a chirp spread spectrum communication system (CSS), comprising:

• receiving an encoded stream of data signals modulated by a plurality of overlapping chirps by a non-coherent receiver at non-coherent FIR chirp matched filter, the encoded stream having a data rate, Tb,new, wherein the encoded stream of data signals is generated with a differential phase shift keying (DPSK) convertor;
• generating an internal chirp signal by a non-coherent finite impulse response (FIR) chirp matched filter, the internal chirp signal having an FT product equal to a sweep frequency (F) multiplied by the inverse of the data rate of the chirp spread spectrum communication system, Tb,old;
• matching the encoded stream to the internal chirp signal and generating a stream of first chirp matched signals;
• delaying each first chirp matched signal by a FIR delay filter and generating a second chirp matched signal which is phase shifted from the first chirp matched signal;
• multiplying the second chirp matched signal by the first chirp matched signal and generating a stream of multiplied chirp matched signals each having a main lobe;
• integrating a plurality of amplitudes of the stream of multiplied chirp matched signals over each main lobe for a time period less than the inverse of the first data rate and generating a sum of the amplitudes for each of the multiplied chirp matched signals;
• determining a polarity of the sum of the amplitudes for each of the multiplied chirp matched signals, converting each sum to a one or a zero based on the polarity;
• and
• outputting a decoded stream of ones and zeroes representative of a plurality of data signals.