Title :
BER performance of chirp QPSK in multipath channel
Author :
Feng, Zhi-Cheng ; An, Jian-ping
Author_Institution :
Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China
Abstract :
Chirp signal can be modulated to transmit digital data. We investigated quadrature phase shift keying (QPSK) modulation for chirp signals and analyzed the bit error rate (BER) performance in multipath fading channel. In receiver, synchronous demodulation is used to demodulate received chirp signal, and the output of multipath signal in matched filter has two factors to interfere with the decision vector of direct signal. When the initial frequency equals to the frequency deviation during a half symbol duration, and the chirp rate is negative slope, the output of multipath signal in matched filter has the same phase or the reverse phase as that of direct signal, the impact of multipath signal on BER performance of demodulation is alleviated. Finally, numerical simulation results show the effectiveness of the scheme for mitigating multipath interference.
Keywords :
chirp modulation; error statistics; fading channels; multipath channels; phase shift keying; BER performance; bit error rate performance; chirp QPSK; chirp signal; multipath channel; multipath fading channel; multipath signal; quadrature phase shift keying modulation; synchronous demodulation; Bit error rate; Chirp; Demodulation; Matched filters; Phase shift keying; Signal to noise ratio; Vectors; bit error rate; chirp; multipath interference; quadrature phase shift keying;
Conference_Titel :
Electronics, Communications and Control (ICECC), 2011 International Conference on
Conference_Location :
Ningbo
Print_ISBN :
978-1-4577-0320-1
DOI :
10.1109/ICECC.2011.6066430
