Abstract: Based on strong autocorrelation of up-chirp and down-chirp, and extra-low cross-correlation between them, and using Chirp-BOK, we propose the Chirp-BOK-BPSK modulation that can be used in UWB wireless communication system. In this scheme, input data are modulated onto both phases of the Chirp and slope of instantaneous frequency. The BER performance of Chirp-BOK-BPSK UWB scheme is analyzed in an AWGN environment. In the indoor setting, however, the system shows seviere ISI. Simulation has been done to obtain BER performance of the Chirp-BOK-BPSK and compared with the Chirp-BOK UWB. The results show that BER of Chirp-BOK-BPSK is less than 10-4 at a 12dB SNR.

Key words: UWB, chirp, Chirp-BOK-BPSK，BPSK