BER performance of digital color shift keying with target color control

In this paper, target color control for digital color shift keying (DCSK) with multiple multicolor LEDs is presented for improving illumination performances of the modulated DCSK signal. This DCSK system using multiple multicolor LEDs can represent the conventional multi-level CSK symbol with the total amount of each non-varying “On-Off” intensity of multiple LEDs. This paper analyzes the illumination and communication performances of DCSK signals, including correlated color temperature (CCT), color tolerance, color rendering index (CRI), and bit error rate (BER). In particular, the BER performances of the DCSK constellations points, which achieve CCT = 3000K, 5000K, and 6500K, are evaluated from theoretical analysis under the conditions of total optical power or total luminous flux is constant for flicker mitigation. Consequently, the CRI performances can be increased when the number of Quad LEDs (QLEDs) increases. Moreover, it can be seen that the BER performance of DCSK with desired CCT of 5000K is better than those of 3000K and 6500K.