Abstract: A method of signal processing and a signal processor for a receiver for OFDM encoded digital signals. OFDM encoded digital signals are transmitted as data symbol sub-carriers in several frequency channels. A subset of the sub-carriers is in the form of pilot sub-carriers having a pilot value (ap) known to the receiver. The method comprises estimation of a channel transfer function (H) and a derivative of the channel transfer function (H?) by means of a channel estimation scheme from a received signal (y). Then, an estimation of data (a) is performed from the received signal (y) and the channel transfer function (H). Finally, an estimation of a cleaned received signal (y2) is performed from the data (a), the derivative of the channel transfer function (H?) and the received signal (y) by removal of inter-carrier interference (ICI), by taking into account at least one of a previous and a future OFDM symbol, followed by an iteration of the above-mentioned estimations.

Abstract: A method of signal processing for a receiver for OFDM encoded digital signals, for counteracting inter-carrier interference (ICI) caused by Doppler broadening. The OFDM encoded digital signals are transmitted as sub-carriers in several channels, which form OFDM blocks. The method comprises estimation of a channel transfer function (?1) by a channel estimation scheme in each sub-carrier and estimation of data (â1) by a data estimation scheme from said channel transfer function (?1) and a received signal (y0). Then, a derivative (Hj?) of said channel transfer function in each sub-carrier is estimated by a temporal filtering; and the inter-carrier interference (ICI) is removed from said received signal by using the estimated data (â1) and the estimated derivative (Hj?) of the channel transfer function in order to obtain a cleaned received signal (y1).

Abstract: A method of signal processing for a receiver for OFDM encoded digital signals. The OFDM encoded digital signals are transmitted as data symbol sub-carriers in several frequency channels. A subset of the sub-carriers is in the form of pilot sub-carriers having a pilot value (ap) known to the receiver. First, a received signal (y0) is obtained, followed by a first estimation of a pilot channel transfer function (H0)at pilot sub-carriers from said received signal (y0) and said known pilot values (ap). Then a second estimation of a channel transfer function (H1) is performed at all sub-carriers from said pilot channel transfer function (H0). A third estimation of a derivative (H?1) of the channel transfer function (H1) is performed from the channel transfer function (H1) and a channel transfer function (H3) from a past OFDM symbol.

Abstract: A method of signal processing and a signal processor for a receiver for OFDM encoded digital signals. The OFDM encoded digital signals are transmitted as data symbol sub-carriers in several frequency channels. A subset of said sub carriers is in the form of pilot sub-carriers having a value known to the receiver. A first estimation of channel coefficients (H0) at said pilot sub-carriers is performed followed by cleaning of the estimated channel coefficients (H0) at the pilot sub-carriers. Then, a second estimation of channels coefficients (H1) is performed at the data symbol sub-carriers. The first estimation is performed by dividing received symbols (yp) at said pilot sub-carriers by the known pilot symbols (ap). the channel frequency response is supposed to vary linearly within one OFDM symbol. Therefore for each symbol and sub-band, a channel frequency response and its derivate are calculated or interpolated.

Abstract: A system is provided for processing electronic devices, and in particular for handling, inspecting, sorting and offloading the same. An apparatus for inspecting an electronic device comprises a holder for supporting the electronic device and a driving mechanism for moving the electronic device between an onloading position where the electronic device is placed onto the holder and an offloading position where the electronic device is removed from the holder. A first optical system between the onloading and offloading positions is configured to inspect a first surface of the electronic device while it is supported by the holder, Concurrently or subsequently, a second optical system between the onloading and offloading positions is configured to inspect a second surface of the electronic device that is opposite to the first surface while it is supported by the holder.