公开(公告)号：US06654596B1

公开(公告)日：2003-11-25

申请号：US09492381

申请日：2000-01-27

申请人： Jan Peter Jakobsson ,  Sven Erik Niklas Stenström

发明人： Jan Peter Jakobsson ,  Sven Erik Niklas Stenström

IPC分类号： H04B126

CPC分类号： H04B1/30 ,  H03D3/008

摘要： A homodyne radio receiver apparatus receives radio frequency signal bursts containing a number of symbols and generates digital samples of at least a complex base band signal (I and Q) of each signal burst. A DC compensator comprises an average calculator (8,8′), which determines an average DC-level of said samples, and a signed square sum calculator (9,9′), which calculates a signed square sum of a plurality of said samples and weights the square sum by a compensation factor. Correction means (10,10′) subtracts the square sum from an output of said average calculator means for forming the DC-level estimate.

摘要翻译： 零差无线电接收机装置接收包含多个符号的射频信号脉冲串，并生成至少每个信号脉冲串的复基带信号（I和Q）的数字样本。 直流补偿器包括确定所述样本的平均直流电平的平均计算器（8,8'）和有符号的平方和计算器（9,9'），其计算多个所述样本的有符号平方和 并将平方和加权补偿因子。 校正装置（10,10'）从用于形成直流电平估计的所述平均计算器装置的输出中减去平方和。

公开(公告)号：US06757340B1

公开(公告)日：2004-06-29

申请号：US09255576

申请日：1999-02-22

申请人： Jan Peter Jakobsson

发明人： Jan Peter Jakobsson

IPC分类号： H04L2506

CPC分类号： H04L25/062 ,  H03D3/008 ,  H04B1/30

摘要： A radio receiver and method is provided that effectively compensates for an undesirable DC offset in a digital section of the radio receiver by preloading a filter with an average DC offset before filtering a signal within the filter. More specifically, the radio receiver includes an antenna for receiving a radio signal, and an analog section for demodulating the received radio signal into at least one baseband signal. The radio receiver also includes an analog-to-digital section for converting the at least one baseband signal into at least one digital baseband signal. The radio receiver further includes a preloading system for calculating an average DC offset using a predetermined number of symbols from the at least one digital baseband signal and for preloading a filter with the calculated average DC offset prior to filtering the at least one digital baseband signal in the filter.

摘要翻译： 提供了一种无线电接收机和方法，其通过在对滤波器内的信号进行滤波之前预先加载具有平均DC偏移的滤波器来有效地补偿无线电接收机的数字部分中的不期望的DC偏移。 更具体地，无线电接收机包括用于接收无线电信号的天线和用于将所接收的无线电信号解调为至少一个基带信号的模拟部分。 该无线电接收机还包括用于将至少一个基带信号转换成至少一个数字基带信号的模拟 - 数字部分。 无线电接收机还包括预加载系统，用于使用来自至少一个数字基带信号的预定数量的符号来计算平均DC偏移量，并且在滤波至少一个数字基带信号之前，将具有计算出的平均DC偏移的滤波器预加载 过滤器。