Title :
Frequency selective Rician fast fading estimation for the downlink of TD-SCDMA system in the presence of a residual frequency offset
Author :
Junfeng Wang ; Jianfu Teng ; Yue Cui ; Xiurong Ma
Author_Institution :
Sch. of Electron. Inf. Eng., Tianjin Univ., Tianjin, China
Abstract :
In this paper, a new scheme is proposed for estimating the frequency selective Rician fast fading channel for the downlink of TD-SCDMA system in the presence of a residual frequency offset (RFO). Via modifying the burst structure, the channel impulse response (CIR) with the RFO for each block of the modified burst structure is first modeled as a linear function of time, which is analysed and verified by theory and computer simulation, respectively. Then, a maximum-likelihood-based method is presented along with the modified burst structure to estimate these time-varying CIR coefficients with the RFO. Finally, the simulation results illustrate that the proposed method leads to small mean square error for fading estimation even at high speed of the mobile terminals and the RFO up to 200 km/h and 200 Hz, respectively.
Keywords :
Rician channels; channel estimation; code division multiple access; maximum likelihood estimation; mean square error methods; time division multiplexing; RFO; TD-SCDMA system; channel impulse response; computer simulation; downlink; frequency selective Rician fast fading channel estimation; maximum-likelihood-based method; mean square error; mobile terminal; modified burst structure; residual frequency offset; time-varying CIR coefficient estimation; TD-SCDMA system; channel estimation; frequency selective Rician fast fading; maximum-likelihood; residual frequency offset;
Conference_Titel :
Signal Processing (ICSP), 2012 IEEE 11th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-2196-9
DOI :
10.1109/ICoSP.2012.6491843
