Frequency-Shift Chirp Spread Spectrum Communications With Index Modulation

This article introduces a novel frequency-shift chirp spread spectrum (FSCSS) system with index modulation (IM). By using combinations of orthogonal signals for message representation, the proposed FSCSS (FSCSS-IM) is very flexible to design and can achieve much higher data rates than conventional under same bandwidth. The presents optimal detection algorithms, both coherently noncoherently, FSCSS-IM system. Furthermore, low-complexity noncoherent algorithm also developed reduce computational complexity receiver, which shown near-optimal performance. results are presented demonstrate that system, while enabling rates, enjoys similar bit-error performance as