A Novel Preamble Design for OFDM Transmission Parameter Signalling

Abstract

Abstract-A novel preamble design is proposed for orthogonal frequency division multiplexing systems, which exploits the variable distance between a pair of training sequences for the transmission parameter signalling. Compared to the existing P1-symbol based preamble for the second generation digital terrestrial television broadcasting standard, the proposed design maintains the high performance and robustness in timing and carrier frequency offset estimation while significantly reducing the signalling detection complexity. Simulation results demonstrate that the proposed preamble achieves a better signalling detection performance than the standardized P1 symbol design.

Robust Preamble Design for Synchronization, Signaling Transmission, and Channel Estimation

“…Finally, the signaling demodulation exploits the correlation of adjacent active pilots. However, the correlation may be severely corrupted owing to some null pilots arranged between the adjacent active carriers [13].…”

“…∆ε > 0 means that CIR estimation window position need to be lagged, and vice versa. The CIR estimation (13), (14) can also be used for the following OFDM symbols. For instance, a P2 symbol following the P1 symbol can provide static, configurable, dynamic layer-1 signaling as well as data in DVB-T2 system [2].…”

“…In the frequency domain of the OFDM symbol, all the pilots are active, which is different from the conventional schemes [2], [13]. The frequency domain of the OFDM symbol can be represented as…”

“…In terms of signaling demodulation, a preamble based on distance detection (PBDD) is introduced [13] which has a better performance than the P1 symbol in DVB-T2. In this preamble, a pair of identical pseudo-noise (PN) sequences with variable distance are inserted in the frequency domain to convey the signaling information.…”

“…At the receiver, a low-complexity circular correlation is used for CFO estimation and signaling demodulation. Compared with the conventional preamble schemes [2], [13], the proposed preamble improves the CFO estimation performance and the signaling capacity. Meanwhile, in the proposed preamble scheme, all the subcarriers are exploited.…”