Time-frequency joint positioning for Chinese digital television terrestrial broadcasting system

The digital television terrestrial broadcasting (DTTB) system is a promising candidate for positioning due to the high power level and wide coverage of DTTB signals. This paper proposes a positioning scheme for Chinese DTTB system whose key technology is time domain synchronous OFDM (TDS-OFDM). The transmission parameter signaling (TPS) embedded in TDS-OFDM signals are firstly regarded as pilots, and then the time-frequency joint positioning algorithm is proposed using both the time-domain pseudo-noise (PN) sequence and the frequency-domain TPS (pilots). The Cramer-Rao lower bound (CRLB) of the proposed scheme is also presented. Numerical results show that the positioning accuracy is less than 0.2 m when the signal-to-noise ratio (SNR) is greater than 20 dB under the additive white Gaussian noise (AWGN) and the simulated multi-path channels.