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Data processing apparatus and method

A receiver for detecting and recovering data from Orthogonal Frequency Division Multiplexed (OFDM) symbols. The OFDM symbols include within a repeating time frame a signalling OFDM symbol and one or more data bearing OFDM symbols, the signalling OFDM symbol including a pre-amble guard interval and a post-amble guard interval, the pre-amble and the post-amble guard intervals being formed by copying samples from a useful part of the signalling OFDM symbol in the time domain. The receiver includes a signalling and guard detector, which includes a correlator comprising a first branch which includes a first moving averaging filter, which is arranged to form pre-amble average correlated samples by averaging a value of a plurality of pre-amble correlated samples within a moving window, the plurality of samples averaged within the moving window corresponding to a temporal length of the post-amble (Tb), a second branch which includes a second moving averaging filter, which is arranged to form post-amble average correlated samples by averaging a value of a plurality of post-amble correlated samples within a moving window, the plurality of samples averaged within the moving window corresponding to a temporal length of the pre-amble (Tc), a combiner, which is arranged to combine the averaged pre-amble correlated samples and the averaged post-amble correlated samples to form output correlation samples. A post processing detector can detect the signalling OFDM symbol and moreover a synchronisation point derived from a centre of the signalling OFDM symbol with improved accuracy. The receiver finds application, for example, with DVB-T2 in detecting the P1 symbol.
Owner:SATURN LICENSING LLC

Preferential channel identification technology for secondary development of mature oil field

InactiveCN105740563AAdapt to secondary developmentUnique invention theoryDesign optimisation/simulationSpecial data processing applicationsPhacusOil field
The invention discloses a preferential channel identification technology for the secondary development of a mature oil field. The technology comprises the following technical steps of 1, oil deposit area substance streamline simulation phase, wherein the phase focuses on the comprehensive analysis of the oil deposit, particularly the dynamic description and research phase of the four-dimensional oil deposit; and 2, modeling on the preferential channel identification technology for the secondary development of the mature oil field, specifically including fine geologically modeling, processing by using dynamic heterogeneous model and establishing a comprehensive adjustment and development scheme; the specific processes are as shown in figure 1. The technology provided by the invention is unique and novel in theory, applicable to the secondary development of the old producing area, in particular applicable to the secondary oil exploitation of the oil field in northeast and other old industrial bases, and is accurate and reliable; the technology provided by the invention can play a role in decreasing cost and increasing benefit, and in particular applicable to the deflationary environment with continuously decreased international oil price and gloomy economy.
Owner:BEIJING HXXN PETROLEUM TECH CO LTD
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