| 摘要 |
Detecting a symbol boundary in a data packet comprising a guard interval preceding a preamble having a predetermined sequence of symbols, comprising: receiving a signal representing a data packet; sampling the received signal at a sampling rate; estimating channel impulse responses from a set of samples in dependence on the predetermined sequence of symbols of the preamble; determining an energy value for each of a plurality of windows of channel impulse responses, each of the windows corresponding to W number of consecutive samples, the energy value for each of the windows being indicative of the total energy associated with the channel impulse responses of that window; determining which of the windows has the greatest energy value; and identifying the earliest sample of the consecutive W samples in said determined greatest energy window, the earliest sample being indicative of a symbol boundary for the preamble. The symbol boundary detection may be performed on an Orthogonal Frequency Division Multiplex signal. A further embodiment describes a training field preceding the guard interval and estimating a boundary between the training field and the guard interval, the set of samples being taken from said estimated boundary for a period corresponding to the duration of the preamble. |
