A frame synchronization and frequency offset estimation algorithm for OFDM system and its analysis
EURASIP Journal on Wireless Communications and Networking
Efficient Inner Receiver Design for OFDM-Based WLAN Systems: Algorithm and Architecture
IEEE Transactions on Wireless Communications
Design of multiplierless correlators for timing synchronization in IEEE 802.11a wireless LANs
IEEE Transactions on Consumer Electronics
Design and implementation of synchronization and AGC for OFDM-based WLAN receivers
IEEE Transactions on Consumer Electronics
Modified virtually scaling-free adaptive CORDIC rotator algorithm and architecture
IEEE Transactions on Circuits and Systems for Video Technology
Low-complexity sequential searcher for robust symbol synchronization in OFDM systems
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
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Orthogonal frequency division multiplexing (OFDM) is a viable technology for high-speed data transmission by virtue of its spectral efficiency and robustness to multi-path fading. These advantages can be achieved only with good synchronization both in time and frequency. This paper proposes new efficient synchronization methods for an OFDM-based system, IEEE 802.16d. For the coarse time synchronization and the fractional carrier frequency offset (CFO) estimation, a disjoint architecture is proposed that performs auto-correlations separately to achieve more reliable frequency synchronization and to reduce overall hardware complexity and power consumption. In addition, for the fine symbol timing offset (STO) and the integer CFO, a new joint estimation method employing parallel cross-correlations between the received samples and the pre-rotated training sequences is proposed. Experimental results show significantly superior performance to the previous synchronization methods. A prototype synchronizer based on the proposed methods is designed with a 0.25- µm CMOS process, which reduces power consumption by more than 60% compared to a conventional synchronizer.