摘要:
This disclosure relates a method and apparatus for generating pre-coding matrix codebook. The method for generating pre-coding matrix codebook, comprising: acquiring a universal set of pre-coding matrixes in a first format; acquiring a universal set of pre-coding matrixes in a second format; selecting a first predetermined number of pre-coding matrixes in the first format from the universal set of pre-coding matrixes in the first format; and selecting a second predetermined number of pre-coding matrixes in the second format from the universal set of pre-coding matrixes in the second format, according to the selected first predetermined number of pre-coding matrixes in the first format.
摘要:
Embodiments of the invention generally include multi-component catalyst systems, polymerization processes and heterophasic copolymers formed by the processes. The multi-component catalyst system generally includes a first catalyst component selected from Ziegler-Natta catalyst systems including a diether internal electron donor and a metallocene catalyst represented by the general formula XCpACpBMAn, wherein X is a structural bridge, CpA and CpB each denote a cyclopentadienyl group or derivatives thereof, each being the same or different and which may be either substituted or unsubstituted, M is a transition metal and A is an alkyl, hydrocarbyl or halogen group and n is an integer between 0 and 4. The multi-component catalyst system further includes a second catalyst component generally represented by the formula XCpACpBMAn, wherein X is a structural bridge, CpA and CpB each denote a cyclopentadienyl group or derivatives thereof, each being the same or different and which may be either substituted or unsubstituted, M is a transition metal and A is an alkyl, hydrocarbyl or halogen group and n is an integer between 0 and 4 and wherein the second catalyst component exhibits a higher ethylene response than the first catalyst component.
摘要:
The present invention provides a wireless transmission method and system based on maximum multi-path delay estimation. A wireless transmission method based on an estimation of maximum multi-paths delay, comprising: a communication apparatus involved in wireless communication estimates the maximum multi-paths delay of a currently received frame; the communication apparatus performs a quantization and coding on feedback information related with the estimated maximum multi-paths delay, and then sends the feedback information which has been subjected to the quantization and coding to an opposing communication apparatus which is in wireless communication with the communication apparatus; the opposing communication apparatus recovers the feedback information by demodulating and decoding the feedback information which has been subjected to the quantization and coding; the opposing communication apparatus performs an adaptive adjustment of wireless signals transmitted to the communication apparatus, based on the recovered feedback information. With this method, system parameters can be adaptively adjusted so as to that sufficiently improves the spectrum utilization efficiency of wireless resources (the throughput is increased by about 5%).
摘要:
The detecting and monitoring of solid structure or phase transformation, such as those used for testing the formation of gas hydrates and their inhibition by chemical additives may be conducted in a multi-test assembly of laboratory bench scale loops. The test loop contains a fluid that includes water and hydrate-forming guest molecules such as methane, ethane, carbon dioxide and the like at hydrate-forming conditions of low temperature and high pressure. A small bit or “pig” may be circulated through the test loop at variable speeds to circulate the fluid in the loop. The pig may be moved or impelled through the test loop remotely. The exterior of the pig and/or the interior of the loop may be smooth and/or have a friction-reducing coating thereon to facilitate movement of the pig through the loop. The formation of hydrates may be monitored with consistent and reproducible results.
摘要:
Embodiments of the present invention provide a method, apparatus and system for temporal synchronization of digital content based on a marker symbol and a marker code. A marker symbol is inserted at an identifiable location of a payload (e.g., the beginning and/or end of a payload) at regular intervals in the digital content and the payload is marker coded to form a periodic sequence. The payload is marker coded such that the maker symbol is not repeated by the coded payload. The periodic sequence is then embedded into digital content. A decoder is able to re-synchronize the payload by determining the location of the marker symbol. As such, a method, apparatus and system is provided for robust temporal synchronization for, for example, content encoding and decoding for applications such as audio and video water-marking and the like.
摘要:
A method for feeding back spatial channel state and a device for feeding back spatial channel state are disclosed by the invention. The method for feeding back spatial channel state according to an embodiment of the present invention includes: determining the probability of being scheduled of the spatial channel; determining feedback information based on the probability of being scheduled of the spatial channel; and transmitting the determined feedback information; wherein more feedback information is used for the spatial channel having high probability of being scheduled than that of the spatial channel with low probability of being scheduled.
摘要:
The present invention relates to a bit allocation apparatus, a transmitter, a bit allocation method and a power allocation method. The apparatus comprises: a selecting unit, for selecting a collection of modulation symbols from a predetermined number of modulation symbols according to a bit metric indicative of channel quality of each bit location in each modulation symbol, thus that a sum of numbers of bits on the modulation symbols included in the collection of modulation symbols is equal to a number of code word bits to be allocated; and an allocating unit, for allocating code word bits to be allocated to modulation symbols in the collection of modulation symbols selected by the selecting unit. The apparatus may select a sub-collection with good performance from a predetermined number of modulation symbols or subcarriers to allocate bits, thereby ensuring that the demodulation algorithm output optimal soft demodulating information.
摘要:
New tertiary amine salts are useful as gas hydrate inhibitors in oil and gas production and transportation. These tertiary amine salts give very good separation from an emulsion, are economic and have reduced toxicity concerns.
摘要:
A method and a device for generating a precoding matrix codebook used in a multi-antenna communication system that includes determining an initial precoding matrix codebook consisted of L precoding matrixes; dividing a channel set into L channel groups being in one-to-one correspondence to the precoding matrix of the initial precoding matrix codebook; selecting a precoding matrix which optimally matches the channel group, from the precoding matrix universal set, to form a new precoding matrix codebook; judging whether the initial precoding matrix codebook and the new precoding matrix codebook are same; adopting the new precoding matrix codebook as the initial precoding matrix codebook, and if the initial and new precoding matrix codebook are not same, return to precoding; and adopting the new precoding matrix codebook as a precoding matrix codebook to be used in the multi-antenna communication system if the initial and new precoding matrix codebook are same.
摘要:
This disclosure relates a method and apparatus for generating pre-coding matrix codebook. The method for generating pre-coding matrix codebook, comprising: acquiring a universal set of pre-coding matrixes in a first format; acquiring a universal set of pre-coding matrixes in a second format; selecting a first predetermined number of pre-coding matrixes in the first format from the universal set of pre-coding matrixes in the first format; and selecting a second predetermined number of pre-coding matrixes in the second format from the universal set of pre-coding matrixes in the second format, according to the selected first predetermined number of pre-coding matrixes in the first format.