Patent ID: 8019025

Claim:
A method for performing frame synchronization by setting a training sequence in a wireless communication system, the method comprising the steps of: configuring a transmitter to send a signal to a receiver, the signal incorporating the training sequence; setting the training sequence, x[n], between the transmitter and receiver using a differential detection-based frame synchronization unit of the receiver, in a scheme where a differential value of the training sequence corresponds to a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence, c[n], according to EXPRESSION 6, so that a differential detection-based correlation property (EXPRESSION 4) equals a simple correlation property (EXPRESSION 1), wherein a simple correlation property using the CAZAC sequence, c[n], equals the EXPRESSION 1: R ⁡ ( τ ) = ∑ n = 0 L - 1 ⁢ y ⁡ [ n + τ ] ⁢ c * ⁡ [ n ] EXPRESSION ⁢ ⁢ 1 where y[n] corresponds to the received signal, and where L represents the length of the training sequence, c[n] is the CAZAC sequence and is set differently depending on a sectionalizing factor k as in the EXPRESSION 2 below: c ⁡ [ n ] = { exp ⁡ [ j2π ⁢ ⁢ k L ⁢ ( n + n ⁢ n + 1 2 ) ] , ⁢ L ⁢ ⁢ is ⁢ ⁢ odd exp ⁡ [ j2π ⁢ ⁢ k L ⁢ ( n + n 2 2 ) ] , ⁢ L ⁢ ⁢ is ⁢ ⁢ even EXPRESSION ⁢ ⁢ 2 wherein a differential detection-based correlation property using the CAZAC sequence, c[n], equals the EXPRESSION 4: R ⁡ ( τ ) = ∑ n = 1 L - 1 ⁢ y * ⁡ [ n - 1 + τ ] ⁢ y ⁡ [ n + τ ] ⁢ x ⁡ [ n - 1 ] ⁢ x * ⁡ [ n ] ; and EXPRESSION ⁢ ⁢ 4 wherein the EXPRESSION 6 is as follows: EXPRESSION 6 c[n]={dot over (x)}[n− 1] x[n] , ( n≧ 1, n[ 0]=exp[ jφ ]) where x[n] corresponds to the training sequence set between the transmitter and the receiver.