Compensation for the demodulated phase errors caused by sampling frequency offset in OFDM systems
OFDM has been successfully adopted in Digital video broadcasting-terrestrial (DVB-T) due to its excellent spectral efficiency and inherent resistance to multipath effect.However,OFDM is a multi-carrier transmission technique and sampling frequency offset (SFO) always exists in OFDM systems.It must be noticed that SFO would result in interference between adjacent sub-carriers (ICI) as well as demodulated phase deviation and seriously degrade performance of demodulation.Therefore,in this paper we propose an adaptive sampling frequency tracking and demodulated phase error compensation scheme based on synchronization symbol information of OFDM signals.We achieved correction of phase errors and solved the problem that OFDM signals cannot be correctly demodulated for complex constellation when SFO exists.Infield test results of the proposed scheme in an ADSL environment indicate great performance improvement of demodulation,typel.
OFDM sampling frequency Offset phase deviation
Yujie Xiong Xiaofei Zhang Yi Zhang
School of Information and Electronic Beijing Institute of Technology,BIT Beijing,P.R China
国际会议
杭州
英文
382-385
2013-03-22（万方平台首次上网日期，不代表论文的发表时间）