Channel equalizer performance analysis for Hybrid 3DTV in ATSC 3.0 standard
Recently, next generation broadcasting standardization has being conducted to transmit UHDTV contents. In this paper, an equalizer using least square estimation is designed and reception performance is analyzed for Hybrid 3DTV transceiver system. Equalizer structure for Hybrid 3DTV is designed by referring to ATSC 3.0 PHY layer. Hybrid 3DTV uses time division multiplexing for transmitting two physical layer pipes. The equalizer performance is simulated on Pedestrian Indoor channel which has long echoes. Simulation result shows that equalizer performance for Hybrid 3DTV is improved about 5 dB.
Physical Layer Framing for ATSC 3.0
An ATSC 3.0 physical layer frame consists of a bootstrap immediately followed by a preamble containing layer 1 control signaling and then one or more subframes carrying payload data. Subframes within a particular frame may be of the same or different types, with different subframe types being configured for different classes of receivers (e.g., mobile versus fixed). This paper focuses on the subframe structure, configuration, and contents, including subframe boundary symbols which carry additional pilots to assist with channel estimation at the receiver and cell multiplexing which maps physical layer pipe (PLP) payload data to physical layer resources within each subframe. Various methods for cell multiplexing multiple PLPs within a subframe are discussed and described, including time division multiplexing, frequency division multiplexing, time-frequency division multiplexing, and layered division multiplexing. Frequency interleaving, pilot insertion, and guard interval insertion are also covered, including a method of distributing extra samples to guard intervals in order to obtain frame lengths equal to an integer number of milliseconds.
System Discovery and Signaling Transmission Using Bootstrap in ATSC 3.0
In ATSC 3.0, a bootstrap is used to enable service discovery and signaling reception at low signal levels. The ATSC 3.0 bootstrap is described in this paper. The bootstrap signal consists of several specially-coded OFDM symbols. The first bootstrap symbol is used for detection, synchronization, and service discovery. The remaining symbols convey system parameters describing the associated physical layer frame structure, e.g., signal bandwidth, sampling rate. The originating sequence for bootstrap signaling is a combination of a Zadoff-Chu sequence and a pseudo-noise sequence in the frequency domain. Signaling information is conveyed through the use of cyclic shifts in the time domain. The coarse timing synchronization, symbol detection, and fractional frequency offset estimation are performed simultaneously in the time domain, while the integral frequency offset estimation and the transmission parameter signaling decoding are performed in the frequency domain. Superior detection and decoding performance are proved by simulation in typical use cases, and very low thresholds and capability in difficult channel models are enabled by the use of the bootstrap.