Patent ID: 7733988

Claim:
A method of detecting a signal, comprising: generating at least one multi-frame correlation set based on a correlation set for at least one previous frame and a correlation set for the current frame such that based on at least a portion of control data transmitted in the current frame and at least a portion of control data transmitted in the at least one previous frame being the same, the correlation set for the current frame and the correlation set for the at least one previous frame being determined at least partially based on the portion of the control data that is the same between the current control frame and the at least one previous control frame, wherein each correlation set includes a plurality of correlation values, and each correlation value indicates a likelihood that a codeword is present in a signal; generating decoding metrics for a current frame of a control channel based on the at least one multi-frame correlation set; and detecting whether a signal is present on the control channel based on the generated decoding metrics; wherein in the generating at least one multi-frame correlation, a threshold value of retransmissions is used to determine a number of the at least one previous frame included in generating the at least one multi-frame correlation set.