Multipath Delay Estimation Model and Algorithm in OFDM Systems

Abstract

Abstract:

The precision of the TOA (the time of arrival) estimation is low because it underutilizes the time-frequency characteristics in OFDM (orthogonal frequency division multiplexing) systems. To solve this problem, in this paper, a FDP-MDE (multipath delay estimation based on frequency domain phaseoffset) model was proposed. Besides, a GJ-TDE (grouped joint time delay estimation) algorithm was proposed according to the actual features of the LTE system. First, the time domain signal was converted into the frequency domain signal. Then, it was sampled into the low-dimensional received signal matrix groups, which were used to estimate the time delay. Finally, the mean of all the delay estimation was taken as positioning. The simulation results show that the root mean square error (RMSE) of the GJ-TDE algorithm is 5.503 4 m smaller than that of the synchronization Mensing algorithm when the SNR is 0 dB and the sampling interval is 8.

Key words: orthogonal frequency division multiplexing (OFDM) systems, time of arrival estimation, grouped joint time delay estimation (GJTDE), sampling interval, root mean square error

CLC Number:

TN 929

CHEN Yajun,PENG Jianhua,HUANG Kaizhi,LUO Wenyu. Multipath Delay Estimation Model and Algorithm in OFDM Systems[J]. Journal of Shanghai Jiaotong University, 2014, 48(10): 1372-1377.

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