Exhaustive Search in Complementary Subspace for Carrier Frequency Offset Estimation

• Main Authors: Li-Ya Chang, 張孋雅
• Other Authors: Wen-Thong Chang
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/92819120384711432499

碩士 === 國立交通大學 === 電信工程系 === 91 === An efficient iterative carrier frequency offset (CFO) algorithm for orthogonal frequency division multiplexing (OFDM) is proposed. By exploiting the orthogonality characteristic of OFDM systems, unused sub-channels called virtual sub-carriers are used to form the CFO estimator. By proper selection of the virtual sub-carriers, the associated CFO estimation range can expand the entire sub-carriers frequency range. Instead of exhaustive search over the entire uncertainty range for the CFO estimate, an efficient iterative algorithm to locate the CFO is proposed. The proposed algorithm is very attractive for its low complexity and excellent performance.