Simple non-coherent detection scheme for IEEE 802.15.4 BPSK receivers

A novel, non-coherent bit-level detection scheme is proposed to compensate for the frequency offset efficiently in IEEE 802.15.4 binary phase shift keying (BPSK) receivers. In the proposed scheme, the frequency-offset estimation process only requires comparison, division, and addition operations. The proposed scheme first creates a suitable estimation-region division, thus the mathematical approximation tan−1(x) ≈ x is efficiently utilised to simplify the conventional optimal estimation. The frequency offset and signal-to-noise ratio conditions do not need a priori knowledge. Simulations demonstrate that the proposed scheme is as reliable as the conventional optimal algorithm, but with a significant reduction of complexity.