Patent ID: 7848436

Claim:
A method for detecting a symbol timing synchronization of an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising: receiving, via the OFDM system configured to support transmissions of signals via radio channels that exhibit multi-path delays, a transmission symbol that has a Cyclic Prefix (CP) or a Cyclic Suffix (CS) inserted in a Orthogonal Frequency Division Multiplexing (OFDM) symbol; and applying either a first timing metric or a second timing metric to the received transmission symbol in order to detect a timing synchronization of the OFDM symbol based on a maximum value of the first or second timing metric, wherein the first timing metric is defined as shown in the following formula when the transmission symbol uses the CP: M new_CP ⁡ ( d ) =  P new_CP ⁡ ( d )  R new_CP ⁡ ( d ) ⁢ M CP ⁡ ( d - N 2 - L ) , wherein P new — CP(d) denotes a correlation metric, R new — CP(d) denotes an energy of the OFDM symbol, d denotes a time index, N denotes a length of the OFDM symbol, and L denotes a length of the CP, wherein the second timing metric is defined as shown in the following formula when the transmission symbol uses the CS: M new_CS ⁡ ( d ) =  P new_CS ⁡ ( d )  R new_CS ⁡ ( d ) ⁢ M CS ⁡ ( d - N 2 ) , wherein P new — CS(d) denotes a correlation metric, R new — CS(d) denotes an energy of the OFDM symbol, d denotes the time index, and N denotes the length of the OFDM symbol, wherein the correlation metric P new — CP(d) is obtained by the following formula, wherein r denotes a reception signal, d denotes the time index, and N denotes the length of the OFDM symbol: P new_CP ⁡ ( d ) = ∑ m = 1 N / 2 - 1 ⁢ ⁢ r ⁡ ( d - m ) ⁢ r ⁡ ( d + m ) . , wherein the energy of the OFDM symbol R new — CP(d) is obtained by the following formula, wherein r denotes the reception signal, d denotes the time index, and N denotes the length of the OFDM symbol: R new_CP ⁡ ( d ) = ∑ m = 1 N / 2 - 1 ⁢ ⁢  r ⁡ ( d + m )  2 . , wherein the correlation metric P new — CS(d) is obtained by the following formula, wherein r denotes the reception signal, d denotes the time index, and N denotes the length of the OFDM symbol: P new_CS ⁡ ( d ) = ∑ m = 1 N / 2 - 1 ⁢ ⁢ r ⁡ ( d - m ) ⁢ r ⁡ ( d + m ) . , ⁢ and wherein the energy of the OFDM symbol R new — CS(d) is obtained by the following formula, wherein r denotes the reception signal, d denotes the time index, and N denotes the length of the OFDM symbol: R new_CS ⁡ ( d ) = ∑ m = 1 N / 2 - 1 ⁢ ⁢  r ⁡ ( d + m )  2 .