Research and simulation for an ultra-high-speed mobile broadband multimedia transmission system

This paper presents a broadband multimedia transmission system for the ultra-high-speed mobile application. Based on the time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system, training sequences in frame headers are regarded as samples of time-varying channel parameters under the fast-varying channel, instead of assuming that the channel impulse response remains constant during several frames, and an advanced method of channel estimation and equalization is proposed. The mobile TDS-OFDM system model which is able to estimate the channel parameters quickly is designed for the fast-varying channel with Doppler, by using the dual PN frame structure, LDPC code and method of information aid anti Doppler offset (IAADO). In the simulation, the proposed system offers a performance gain under fast-varying channel, compared with the traditional TDS-OFDM system. The transmission rate can reach 2.1Mbps by using 7.56MHz bandwidth under the six-path channel with 1kHz Doppler at lower than -1dB SNR, which is able to accommodate a multimedia transmission.