公开(公告)号：US20150341078A1

公开(公告)日：2015-11-26

申请号：US14638299

申请日：2015-03-04

Applicant: Texas Instruments Incorporated

Inventor： Srinivas Lingam ,  Timothy Mark Schmidl

IPC: H04B1/7075

CPC classification number: H04B1/7075 ,  H04B1/7087 ,  H04L25/02

Abstract: Methods and apparatus for frequency offset estimation and correction prior to preamble detection of DSSS signals. An integrated circuit is disclosed including a receiver circuit having an input coupled to receive a DSSS signal, the receiver circuit configured to sample the DSSS signal and to output a sequence of digital samples; carrier frequency offset estimation logic configured to perform a carrier frequency offset estimation on the digital samples; carrier frequency correction logic configured to correct the carrier frequency of the sequence of digital samples using the carrier frequency offset estimation and to output a sequence of corrected digital samples; offset quadrature phase shift keying (O-QPSK) demodulation logic configured to perform demodulation on the corrected digital samples and further configured to output symbols corresponding to the corrected digital samples; and preamble identification configured to identify and detect a preamble sequence in the symbols. Additional methods and apparatus are disclosed.

Abstract translation: DSSS信号前导码检测前频偏估计和校正的方法和装置。 公开了一种集成电路，其包括具有耦合以接收DSSS信号的输入的接收器电路，所述接收器电路被配置为对DSSS信号进行采样并输出数字采样序列; 载波频率偏移估计逻辑，被配置为对所述数字样本执行载波频率偏移估计; 载波频率校正逻辑，被配置为使用载波频率偏移估计来校正数字样本序列的载波频率，并输出校正的数字样本序列; 偏移正交相移键控（O-QPSK）解调逻辑，被配置为对所述经校正的数字样本执行解调，并且还被配置为输出与所述经校正的数字样本相对应的符号; 以及前导码识别，被配置为识别和检测符号中的前导码序列。 公开了附加的方法和装置。