OFDM frequency-offset estimating method based on allocycly adjacent structure
A long-period and short-period technology, applied in the field of communication, achieves the effects of high precision and large frequency offset estimation range
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[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0020] The cyclic prefix of the OFDM symbol sent at the transmitting end of the OFDM system is an OFDM cyclic prefix (Heter-cycle abutted CP, HCA-CP) proposed by the present invention. Such as figure 2 As shown, the cyclic prefix is determined by the CP 1 and CP 2 It consists of two parts: the first part is the replication of the front part of the effective data symbol (length N) of OFDM (referred to as the short-period cyclic prefix CP 1 / Sc-CP), length L 1 ; The second part is the replication of the tail part of the OFDM effective data symbol (referred to as the long-period cyclic prefix CP 2 / Lc-CP), the length is L 2 , therefore, the length of the entire cyclic prefix is L (L=L 1 +L 2 )CP 1 The corresponding symbol period is L, and CP 2 The corresponding symbol period is N. The cyclic prefix of the adjacent structure of different pe...
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