| 发明名称 | Carrier frequency acquisition method and apparatus | ||
| 摘要 | The present invention discloses a carrier frequency acquisition method and apparatus in which the structure of a transmission frame includes a short training sequence, the method including: delaying a received short training sequence by L sampling points and multiplying the delayed short training sequence with the original short training sequence to obtain a new sequence; delaying the new sequence by D sampling points and conjugate multiplying the delayed new sequence with the original new sequence; accumulating the results of the conjugate multiplication; and evaluating a phase from the result of the accumulation to estimate carrier frequency offset. With the above method, the present invention is capable of greatly improving the acquisition range of carrier frequency offset while requiring a simple set of hardware. | ||
| 申请公布号 | US9013973(B2) | 申请公布日期 | 2015.04.21 |
| 申请号 | US201213595744 | 申请日期 | 2012.08.27 |
| 申请人 | Omnivision Technologies (Shanghai) Co. Ltd. | 发明人 | Zhang Yun |
| 分类号 | H04J11/00;H04L27/26;H04L27/00 | 主分类号 | H04J11/00 |
| 代理机构 | Blakely Sokoloff Taylor & Zafman | 代理人 | Blakely Sokoloff Taylor & Zafman |
| 主权项 | 1. A carrier frequency acquisition method, comprising the following steps: receiving a transmission frame containing a short training sequence; delaying the received short training sequence by L sampling points and directly multiplying the delayed short training sequence with the received short training sequence to obtain a new sequence, wherein the received short training sequence comprises Q short training symbols; each of the Q short training symbols comprises M sampling points; L=(N+1/2)*M; N is a nonnegative integer smaller than Q; real parts of the first M/2 sampling points of each of the Q short training symbols are imaginary parts of the last M/2 sampling points of the symbol; and real parts of the last M/2 sampling points of each of the Q short training symbols are imaginary parts of the first M/2 sampling points of the symbol; delaying the new sequence by D sampling points and conjugate multiplying the delayed new sequence with the original new sequence, where D is a positive integer; accumulating the results of the conjugate multiplication; and evaluating a phase from the result of the accumulation to estimate a carrier frequency offset. | ||
| 地址 | Shanghai CN | ||