Title :
Multiple Chirp-Rate Modulation Based on Fractional Fourier Transform
Author :
Zhao, Qi-Ming ; Zhang, Qin-yu ; Zhang, Nai-Tong
Author_Institution :
Sch. of Electron. & Inf. Technol., Harbin Inst. of Technol., Harbin, China
Abstract :
A novel modulation scheme called Multiple Chirp-rate-Shift Keying (MCrSK) is proposed, which uses different chirp-rates to represent symbols. Due to the Fractional Fourier Transform (FrFT) properties of the chirp signals, a noncoherent demodulation method of MCrSK based on FrFT is available. Results of simulation indicate that MCrSK acquires better Bit Error Rate (BER) performance than MPSK in higher modulation order cases and better power efficiency than MQAM due to its constant envelope property. Further, keying of central frequencies of chirp signal can also be utilized with MCrSK to achieve a hybrid modulation, providing diverse trade-off ways between BER and spectrum efficiency.
Keywords :
Fourier transforms; chirp modulation; error statistics; bit error rate; fractional Fourier transform; multiple chirp-rate modulation; noncoherent demodulation method; spectrum efficiency; Bit error rate; Chirp; Demodulation; Fourier transforms; Frequency modulation; Time frequency analysis; Chirp; Chirp-rate modulation; Fractional Fourier Transform; Multiple Chirp-rate-Shift Keying (MCrSK); hybrid modulation;
Conference_Titel :
Pervasive Computing Signal Processing and Applications (PCSPA), 2010 First International Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-8043-2
Electronic_ISBN :
978-0-7695-4180-8
DOI :
10.1109/PCSPA.2010.171