Abstract:Orthogonal Frequency Division Multiplexing (OFDM) is a kind of multiple carrier digital modulation technique as well as one of the core techniques of the fourth generation of mobile communication. Compared with ordinary digital communication systems, it has higher bandwidth usage rate and stronger capacity of resisting multi-path disturbance, etc, thus suitable for high-speed wireless communication system.
The thesis introduces the basic principle of OFDM and studies the effect that convolution codes, interlacing technology and different modulating methods have on the performance of the OFDM system. On the basis of OFDM systematic mode, the simulation work has been done together with the designing procedures for reference through use of MATLAB tools. Finally, the BER curves of convolution codes，interlacing technology and different modulating methods in AWGN channels are given and compared. The conclusion is satisfactory.
Keywords：Orthogonal Frequency Division Multiplexing；convolution encoding,；interlacement； quaternary phase shift keying；16 Quadrature Amplitude Modulation；the channel of AWGN
