Method of Synchronization using IEEE 802.11a OFDM Training Structure for Indoor Wireless Applications

摘要

IEEE standard 802.1 1 a supports the new high rate physical layer OFDM (Orthogonal Frequency Division Multiplexing) wireless LAN system for operation in the 5GHz unlicensed national information infrastructure (U-NII) band. The OFDM physical layer specifies PPDU (PLCP protocol data unit) frame format that consists of PLCP (Physical Layer Convergence Procedure) preamble, the PLCP header, PSDU, Tail bits and Pad bits. The PLCP preamble is the major component for synchronization, and it consists of 10 "Short" OFDM symbols and 2 "Long" OFDM symbols. This project focuses on researching robust synchronization methods for 802.1 la OFDM systems using the PLCP "Short" and "Long" training symbols. Monte Carol simulations are applied to evaluate the performance of the proposed methods of synchronization in AWGN (Additive White Gaussian Noise) channel and indoor residential channel using JTC (Joint Technical Committee) wireless channel model.