1. A channel estimation method, comprising: converting −1's in a local Barker code to 0's to form a second Barker code, the local Barker code being stored on a cyclic Barker correlator; receiving, by a symbol determination module, a first preamble symbol output from a first Barker correlator and a second preamble symbol output from a second Barker correlator, the first preamble symbol being adjacent to the second preamble symbol; multiplying, by a multiplication module, a result output from the symbol determination module with a correlation result output from the cyclic Barker correlator so as to obtain a channel estimation response, and outputting, the channel estimation response to a time-domain channel data storage unit; and receiving, by the time-domain channel data storage unit, channel estimation responses output from the multiplication module, and averaging the channel estimation responses to obtain a noise-reduced channel estimation response.