Title :
An improved OFDM-MSK system for wireless communications
Author :
Weng, Weiwen ; Liu, Yuan´an ; Hu, Hefei ; Yuan, Dongming
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
As a well attractive modulation scheme, minimum-shift keying (MSK) has a fast roll-off side-lobe spectrum. Because of this excellent property, we introduce MSK into the conventional OFDM to form an improved OFDM-MSK system. The new system can effectively overcome the carrier frequency offset (CFO), mitigate the interference among the sub-carriers. And two kinds of OFDM-MSK receiver are discussed in detail. At the same time, two FFT-based sampling modes (mode A and mode B) are also proposed and analyzed. And a practical OFDM-MSK structure design is given. Simulation results show that when SNR is high, the BER performance of OFDM-MSK systems outperforms that of OFDM-QPSK systems over AWGN and Rayleigh wireless fading channels.
Keywords :
AWGN channels; OFDM modulation; Rayleigh channels; error statistics; fast Fourier transforms; interference suppression; minimum shift keying; radiocommunication; wireless channels; AWGN; BER performance; FFT-based sampling modes; OFDM-minimum-shift keying system; Rayleigh wireless fading channels; carrier frequency offset; interference mitigation; modulation scheme; roll-off side-lobe spectrum; wireless communications; AWGN; Bit error rate; Fading; Interference; OFDM modulation; Phase modulation; Sampling methods; System performance; Viterbi algorithm; Wireless communication; CFO; Continuous Phase modulation(CPM); MLSD; MSK; OFDM-MSK; Viterbi Algorithm(VA); inter-carrier interference(ICI);
Conference_Titel :
Communications and Networking in China, 2009. ChinaCOM 2009. Fourth International Conference on
Conference_Location :
Xian
Print_ISBN :
978-1-4244-4337-6
Electronic_ISBN :
978-1-4244-4337-6
DOI :
10.1109/CHINACOM.2009.5339923
