Patent application number | Description | Published |
20090062487 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethylene characterized by good incorporation of the α-olefin and low long-chain branching. The process is capable of forming high-molecular-weight polyethylene and has good hydrogen sensitivity. | 03-05-2009 |
20090062488 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethylene characterized by good incorporation of the α-olefin and moderate long-chain branching. The process is capable of forming high molecular weight polyethylene and has good catalyst activity. | 03-05-2009 |
20090062489 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged bis-indeno[2,1-b]indolyl zirconium complex. The process uses a highly active catalyst and provides polyethylene characterized by a high level of long-chain branching. | 03-05-2009 |
20090062490 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin, hydrogen, and a catalyst comprising an activator and a supported, dimethylsilyl-bridged bis(indenoindolyl)zirconium complex. The process has high catalyst activity and produces polyethylene having a broad molecular weight distribution. | 03-05-2009 |
20090275711 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in a first reactor in the presence of hydrogen and a catalyst comprising an activator and a supported dimethylsilyl-bridged indeno[1,2-b]indolyl zirconium complex to produce an ethylene homopolymer, removing some of the unreacted hydrogen, and reacting the homopolymer slurry in a second reactor with ethylene and a C | 11-05-2009 |
20090292087 | Olefin polymerization process - A process for making polyethylene having an uncommon but valuable balance of broad molecular weight distribution and a low level of long-chain branching is disclosed. The process comprises polymerizing ethylene in a single reactor in the presence of an α-olefin and a catalyst comprising an activator and a supported dialkylsilyl-bridged bis(indeno[1,2-b]indolyl)zirconium complex. The polyethylene, which has an M | 11-26-2009 |
Patent application number | Description | Published |
20080205504 | DECISION FEEDBACK EQUALIZERS AND EQUALIZING METHODS THEREOF - Decision feedback equalizers and related equalizing method are provided. One proposed decision feedback equalizer includes: a feed-forward filter for filtering an incoming signal to generate a filtered signal; a feedback filter for generating a feedback signal according to a decision signal; an operating device, coupled to the feed-forward filter and the feedback filter, for generating an output signal according to the filtered signal and the feedback signal; a decision device, coupled to the operating device and the feedback filter, for generating the decision signal according to the output signal; and an updating device coupled to the feedback filter for constraining coefficients of predetermined taps of the feedback filter while updating the tap coefficients of the feedback filter; wherein each predetermined tap of the feedback filter corresponds to a tap of the feed-forward filter. | 08-28-2008 |
20080260017 | SELECTIVE SLICING EQUALIZER - An equalizer. The equalizer, either operated in a blind mode or a decision directed mode, comprises a feed-forward filter, a feedback filter, a decision device, a control circuit, and a multiplexer. The feed-forward filter receives an input signal. The feedback filter filters an equalized signal. The combiner combines the feed-forward filtered signal and the feedback filtered signal. The decision device maps the combined signal to one symbol of a symbol set. The control circuit receives the combined output and generates a slice control signal. The multiplexer selects the combined signal or the mapped signal as the equalized according to the slice control signal when operated in the blind mode. | 10-23-2008 |
20080285693 | RECEIVER APPARATUS FOR PROCESSING AMPLITUDE-MODULATED SIGNAL - An amplitude-modulation signal reception apparatus is provided. The amplitude-modulation signal receiver apparatus includes a timing recovery module, a symbol phase shift unit, and an equalizer. The carrier recovery module removes a frequency offset and a phase jitter from an amplitude-modulation signal to generate a carrier recovered signal. The timing recovery module estimates a proper re-sampling position to re-sample the carrier-recovered signal. The phase shifter further shifts the signal that is timing recovered and carrier recovered. The equalizer applies equalization to the shifted signal to remove inter-symbol interference from the shifted signal. | 11-20-2008 |
20080291992 | SYSTEM AND METHOD OF DETECTING BURST NOISE AND MINIMIZING THE EFFECT OF BURST NOISE - A communication system and a method which can reduce the effect of burst noise. The communication system comprises a controllable oscillator, a mixer, a decision circuit, a comparator, a loop filter, and a controller. The controllable oscillator generates an oscillating signal. The mixer coupled to the controllable receives input data and mixes the input data with the oscillating signal. The decision circuit receives the mixed input data and generates an estimated symbol. The comparator generates a decision error between the estimated symbol and the mixed input data. The loop filter coupled to the controllable oscillator filters the decision error, and generates a filtered decision error, and the controllable oscillator generates the oscillating signal according to the filtered decision error. The controller reduces a bandwidth of the loop filter according to the decision error. | 11-27-2008 |
20100040128 | Equalizer and Method for Processing a Signal and Communication Receiving System Comprising the Same - A communication receiving system, an equalizer, and a method for mitigating a burst noise effect of a signal are provided. The equalizer is configured to compensate the signal received from a communication channel. The communication receiving system comprises a receiver, the equalizer, and a detection module. The receiver transmits the signal to the equalizer after receiving the signal. The equalizer compensates the signal and adapts its weighting factors by modifying a correction term upon detection of burst noise. Thereby, the burst noise effect of the signal is mitigated, and the probability that the equalizer survives the burst noise condition increases. Thus, the quality of communication systems under burst noise cases may be enhanced under without increasing the complexity of hardware. | 02-18-2010 |
20110116536 | NARROW-BAND INTERFERENCE DETECTOR, SIGNAL RECEIVER EMPLOYING NARROW-BAND INTERFERENCE DETECTOR AND CONTROLLING DEMODULATOR PARAMETER SETTING ACCORDING TO NARROW-BAND INTERFERENCE DETECTION RESULT, AND RELATED METHODS THEREOF - A signal receiver includes a demodulator, a narrow-band interference detector, and a control module, where the demodulator is for performing signal demodulation upon a received communication signal, the narrow-band interference detector is for performing narrow-band interference detection and accordingly generating a detection result, and the control module is for controlling an operation of the demodulator according to the detection result. In addition, a narrow-band interference detector includes an input port and a processing circuit, where the input port is coupled to an equalizer included in a signal receiver for receiving a signal generated from the equalizer, and the processing circuit is coupled to the input port for performing a narrow-band interference detection according to the signal generated from the equalizer, and accordingly generating a detection result. | 05-19-2011 |
20130069738 | IMBALANCE COMPENSATOR FOR CORRECTING MISMATCH BETWEEN IN-PHASE BRANCH AND QUADRATURE BRANCH, AND RELATED IMBALANCE COMPENSATION METHOD AND DIRECT CONVERSION RECEIVING APPARATUS THEREOF - An imbalance compensator includes a phase/filter mismatch correction circuit and a gain mismatch correction circuit. The phase/filter mismatch correction circuit includes an adjustable filter and a processing unit. The adjustable filter is arranged for adjusting a filter coefficient setting according to a first input signal of a first signal branch and a second input signal of a second signal branch, and generating a first compensated signal to the first signal branch according to the filter coefficient setting and the first input signal. The processing unit is arranged for processing the second input signal according to the first compensated signal and generating a second compensated signal to the second signal branch. The gain mismatch correction circuit is arranged for referring to the first and second compensated signals to configure gain compensation, and applying the configured gain compensation to one of the first and second compensated signals. | 03-21-2013 |