摘要:
A method for reducing the complexity of a multi-bit DAC in a sigma-delta ADC. The DAC resolution can be made to be less than that of the quantizer by canceling truncation error present in multi-bit DACs. Truncation errors are introduced by differences between the digital output word of the quantizer and the digital input word of the feedback DAC(s). The truncation error(s) can be cancelled and eliminated from the system transfer function. A preferred embodiment comprises expanding all feedback loops in the ADC, adding an adjusted truncation error for each feedback loop to an inner feedback loop, and then calculating a correction term for each adjusted truncation error. The correction term can be calculated by zeroing all signals except for the adjusted truncation error being canceled and then calculating a truncation error transfer function.
摘要:
A method for reducing the resolution of a digital-to-analog converter in a multi-bit sigma-delta ADC is described. With the addition of digital sigma-delta modulators in the feedback path of a sigma-delta ADC, the truncation errors between the digital word output of the multi-bit sigma-delta ADC to the DAC input can be shaped to higher order than that of the quantization error. Thus, the DAC resolution can be reduced and the implementation of DEM for multi-bit DAC can be avoided. A preferred embodiment comprises selecting an outermost feedback loop in a sigma-delta ADC that has not been replaced and replacing it with a circuit with an equivalent transfer function. The circuit can be further enhanced with an additional term if the order of the noise shaping of the circuit is less than the order of the noise shaping of the sigma-delta ADC.
摘要:
A method for reducing the resolution of a digital-to-analog converter in a multi-bit sigma-delta ADC is described. With the addition of digital sigma-delta modulators in the feedback path of a sigma-delta ADC, the truncation errors between the digital word output of the multi-bit sigma-delta ADC to the DAC input can be shaped to higher order than that of the quantization error. Thus, the DAC resolution can be reduced and the implementation of DEM for multi-bit DAC can be avoided. A preferred embodiment comprises selecting an outermost feedback loop in a sigma-delta ADC that has not been replaced and replacing it with a circuit with an equivalent transfer function. The circuit can be further enhanced with an additional term if the order of the noise shaping of the circuit is less than the order of the noise shaping of the sigma-delta ADC.
摘要:
An apparatus for providing quantization of synchronization signals may include a processor and a memory storing executable instructions. In response to execution of the instructions by the processor, the apparatus may perform at least receiving an indication of a first variable defining a communication parameter with respect to communications associated with a serving node, receiving an indication of a second variable defining the communication parameter with respect to communications associated with a neighbor node, determining variable information based on a difference between the first variable and the second variable, and providing the variable information to the serving node in a quantized message enabling the serving node to modify a value associated with the first variable to reduce the difference between the first variable and the second variable. A corresponding method and computer program product are also provided.
摘要:
The invention is related to wireless communication systems, methods, devices, computer program, and computer-readable memory medium, and, more specifically, relate to synchronization techniques. The invention relates to a method, including deriving two different timings from a timing source, wherein a first derived timing is a physical timing used for timing at least transmissions from a wireless network access node, and wherein a second derived timing is a virtual timing representing a currently preferred physical timing; receiving an indication of a virtual timing from at least one other network access node; comparing the at least one received virtual timing indication with the derived virtual timing of the network access node, and update the derived virtual timing; and determining achieving synchronization of the derived virtual timing with the at least one received virtual timing, and to adjust the physical timing accordingly.
摘要:
A vacuum mold includes a mold body with a molding surface. The mold body defines a plurality of extraction holes. Each extraction hole includes a first hole portion, a second hole portion, and a connecting portion connecting the first hole portion and second hole portion. The first hole portion is adjacent to the molding surface, and a diameter of the first hole portion is smaller than a diameter of the second hole portion.
摘要:
This invention is directed to compounds which are selective antagonists for melanin concentrating hormone-1 (MCH1) receptors. The invention provides a pharmaceutical composition comprising a therapeutically effective amount of the compound of the invention and a pharmaceutically acceptable carrier. This invention provides a pharmaceutical composition made by combining a therapeutically effective amount of the compound of this invention and a pharmaceutically acceptable carrier. This invention further provides a process for making a pharmaceutical composition comprising combining a therapeutically effective amount of the compounds of the invention and a pharmaceutically acceptable carrier. This invention also provides a method of reducing the body mass of a subject which comprises administering to the subject an amount of a compound of the invention effective to reduce the body mass of the subject. This invention further provides a method of treating a subject suffering from depression and/or anxiety which comprises administering to the subject an amount of a compound of the invention effective to treat the subject=s depression and/or anxiety. This invention further provides a method of treating a subject suffering from a urinary disorder.
摘要:
A transmission timing interval (TTI) adjusting method is provided according to the embodiments of the present invention. Use condition of a system resource is obtained and it is judged whether a user meets a TTI adjusting requirement according to a current TTI of the user and the obtained use condition of the system resource. TTI adjustment is performed on all or a part of the users meeting the TTI adjusting requirement.
摘要:
The present invention relates to a pneumatic device for cleaning ventilation ducts which includes a guiding air hammer, a turning conduit, an air-supply pipe and a slewing mechanism for the conduit. The guiding air hammer is of a hollow spherical or hemispherical shape, connected to the turning conduit and provided with cleaning fumarole and guiding fumarole on its rear arc wall. When cleaning the ventilation duct, according to the principle of air motion, the guiding air hammer cleans our of dust lain on the inner walls and in all the corners of the ventilation ducts with the air-supply pipe stretching means retracting and stretching the air-supply pipe, without an operator entering the ventilation duct. The air-supply pope stretching means may be controlled by manual operation or program composition. The design of the invention may be use for cleaning all ventilation ducts with polygonal section. According to the present invention, the pneumatic device for cleaning ventilation ducts has compact structure, has and advantage of automated operation, may clean any corner of the ventilation duct, decreases the number of operators and reduced the labor strength of the operator greatly.
摘要:
An exemplary embodiment in accordance with this invention is a method for determining the number of interfering streams. The method includes calculating statistical information based on one or more received OFDM signals. The number of interfering streams is estimated from the statistical information in this method. The OFDM signal(s) are received via a plurality of antennas. Storing the OFDM signal(s) in a square matrix may be included in the method. A covariance matrix of the square matrix can be determined; and a noise subspace and a signal plus interference subspace can be determined based on a SVD of the covariance matrix. The statistical information may be based on the signal plus interference subspace. Apparatus, computer programs and computer-readable media are also disclosed.