A method for estimation of the dc - offset of an ofdm - received signal, a device for carrying out the method, radio receiver, with such a device, as well as a method for compensation of a dc - offset of an ofdm - received signal, a device for carrying out this method and the radio receiver with such a device

摘要

In each burst of a, for example, according to the wlan - standard ieee 802.11a / g of transmitted ofdm - signal is a preamble with a sequence of ten short training signals contain. The dc - of the offset of the average value of the signal over a measuring section of the training signal sequence is derived, wherein a chronologically first subsection of the measuring section with an increasing weighting function and a temporally last lower portion of the measuring section is weighted with a falling weighting function. Between the two can be followed by a central lower portion, which is not weighted. The signal is in this way by way of the measurement portion, and the result of accumulated by the sum of the weights of the subsections divided. In this procedure has the center position, the process better filtering properties with respect to a noise contribution of the actual signal on.