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1. 发明授权

US5579347A Digitally compensated direct conversion receiver 失效
标题翻译：数字补偿直接转换接收器
公开(公告)号：US5579347A
公开(公告)日：1996-11-26
申请号：US365037
申请日：1994-12-28
申请人： Bjorn Lindquist , Martin Isberg , Heino Wendelrup , Martin Sallenhag , Kjell Gustafsson
发明人： Bjorn Lindquist , Martin Isberg , Heino Wendelrup , Martin Sallenhag , Kjell Gustafsson
IPC分类号： H04L27/38 , H03D3/00 , H04B1/10 , H04B1/22 , H04B1/26 , H04B1/30 , H04L27/14 , H04L27/227 , H04L27/233 , H03D1/22 , H04B1/12
CPC分类号： H03D3/009 , H04B1/30 , H04L27/2275 , H04L27/2332
摘要： A digitally compensated direct-conversion receiver includes devices for generating digital samples of a base-band in-phase signal and a base-band quadrature signal and for detecting the presence of a second-order product signal produced by an amplitude-modulated interfering signal. Also, the apparatus comprises a device for digitally compensating the digital samples by removing the second-order product signal, thereby producing compensated digital samples. In one method of digitally compensating samples of an information signal quadrature-modulating a carrier signal, estimated samples of a second-order product from a switched carrier signal are formed by averaging the digital samples during two time periods and by determining a time of ramps in the in-phase and quadrature signals that occur between the time periods due to the interfering signal. The digital samples may be differentiated and the results smoothed in determining the time of the ramps. In another apparatus, the estimated samples of the second-order product signal are produced by a device for averaging a square of a difference between respective digital samples of the in-phase signal and the quadrature signal, thereby determining an amplitude of the amplitude-modulated carrier signal, and a device for combining the amplitude and the digital samples, thereby generating the estimated samples.
摘要翻译：数字补偿直接转换接收机包括用于产生基带同相信号和基带正交信号的数字样本的装置，并用于检测由幅度调制的干扰信号产生的二阶乘积信号的存在。此外，该装置包括一个用于通过去除二阶乘积信号对数字样本进行数字补偿从而产生经补偿的数字样本的装置。在对对载波信号进行正交调制的信息信号的样本进行数字补偿的一种方法中，通过在两个时间段期间对数字样本进行平均并且通过确定在两个时间段内的斜坡时间来形成来自切换载波信号的二阶乘积的估计样本由于干扰信号在时间周期之间发生的同相和正交信号。可以区分数字样本，并且在确定斜坡的时间时平滑结果。在另一装置中，二阶乘积信号的估计样本由用于对同相信号和正交信号的相应数字样本之间的差的平方进行平均的装置产生，由此确定幅度调制的幅度载波信号和用于组合幅度和数字样本的装置，由此产生估计样本。

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