Invention Grant
US07720131B2 Iterative pilot-aided frequency offset estimation and C/I measurement for TDMA signal with offset larger than nyquist frequency of the reference symbol rate
有权
偏移导频辅助频偏估计和TDMA信号的C / I测量，偏移大于参考符号率的nyquist频率
- Patent Title: Iterative pilot-aided frequency offset estimation and C/I measurement for TDMA signal with offset larger than nyquist frequency of the reference symbol rate
- Patent Title (中): 偏移导频辅助频偏估计和TDMA信号的C / I测量，偏移大于参考符号率的nyquist频率
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Application No.: US11769537Application Date: 2007-06-27
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Publication No.: US07720131B2Publication Date: 2010-05-18
- Inventor: Vikash Srivastava , Meng Chen
- Applicant: Vikash Srivastava , Meng Chen
- Applicant Address: US IL Bloomingdale
- Assignee: PC-Tel, Inc.
- Current Assignee: PC-Tel, Inc.
- Current Assignee Address: US IL Bloomingdale
- Agency: Husch Blackwell Sanders Welsh & Katz
- Main IPC: H04L27/30
- IPC: H04L27/30
Abstract:
A method and apparatus are provided for decoding a wireless signal from a set of samples with an embedded training sequence. The method includes the steps of determining a first frequency offset from the samples where the first frequency offset is assumed to be less than a Nyquist frequency of the training sequence and calculating a first carrier to interference ratio based upon the first frequency offset. The method further includes the steps of determining a second frequency offset from the samples by subtracting an absolute value of the first frequency offset from an integer multiple of the Nyquist frequency and giving the second frequency offset a sign opposite that of the first frequency offset, calculating a second carrier to interference ratio based upon the second frequency offset and selecting one of the first and second frequency offsets based upon a relative values of the calculated carrier to interference ratios.
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