Abstract:
The present invention provides a constellation mapping method, and the method includes: flipping a plurality of bits in each modulation symbol unit to be mapped in part of or all of modulation symbol units to be mapped of a bit sequence to be mapped; and mapping each flipped modulation symbol unit to be mapped as a modulation symbol in a constellation. By means of the present invention, the phenomenon that consecutive bits have the same reliability can be effectively avoided by changing unevenness of reliability distribution of the consecutive bits, and at the same time, the link performance can be improved.
Abstract:
The present invention discloses a coding method, a coding device, a decoding method and a decoding device for low density generator matrix codes. Wherein the coding method includes: constructing the mother code set of the low density generator matrix code using P low density generator matrix codes of different code lengths at a code rate R0, wherein the mother code set of the low density generator matrix code has a uniform basic matrix Gbuniform, R 0 = k b n b , where kb is the row number of the basic matrix and nb is the column number of the basic matrix; obtaining the length L of an intermediate variable according to the relationship between the length K of the information bit sequence to be coded in the mother code set of the low density generator matrix code and the length L of the intermediate variable; obtaining an expansion factor zk for processing the basic matrix using the length L of the intermediate variable and the row number kb of the basic matrix, and obtaining a generator matrix Gldgc, by modifying and expanding the basic matrix using the expansion factor zk; and coding the information bit sequence to be coded using a matrix Gldgc(1:L,1:N+L−K) comprised of L rows and the first N+L−K columns of the generator matrix.
Abstract:
Methods and apparatus are provided for polishing barrier layer materials. In one embodiment, a composition is provided for removing at least a barrier material from a substrate surface, including includes a base composition, a silica abrasive, a solvent, a pH between about 7 and about 10, and one or more components selected from the group of a metal passivating compound, an oxidizer, and an alumina abrasive. The composition may be used to chemical mechanical polishing process a substrate surface having a ruthenium-based barrier and one or more material selected from the group of a polysilicon layer, a dielectric layer, or metal layer.
Abstract:
A method, device and system for determining a DOA of a signal are described. Determination of the DOA of the signal may include receiving first and second UWB waveforms of the signal at one or more antennas of a UWB transceiver. A window may be defined in the first and second UWB waveforms such that the window is defined in a leading portion of the signal. First and second amplitude values of the respective first and second UWB waveforms in the window may be calculated. An amplitude ratio may be calculated with the first and second amplitude values and compared with calibration data to determine the DOA of the signal.
Abstract:
A system and method for determining position of, for example, a robot based on reflected signals comprises a transmitter for transmitting signals in a number of directions within a range of directions and a receiver for receiving echoes of the signals from any direction in the range. The transmitter has a first rotatable antenna and the receiver has a second rotatable antenna which is mechanically couplable to the second antenna. The received echoes are processed by a processor to derive echo data signals indicative of the distance of the system to one or more reflective surfaces and the direction of the reflective surface(s) relative to the system. The processor is arranged to determine the position of the system relative to a starting position from the derived echo data signals indicative of the distance of the system to the reflective surface(s) and the direction of the reflective surface(s) relative to the system.
Abstract:
A local positioning system is proposed for wirelessly locating an object using existing features within a static environment, such as walls, as the references for determining the position of the system. An antenna 16 attached to the object transmits RF signals which are reflected by the surroundings. During a training mode, the reflected signals are used to train a neural network 22, 43 to map the position of the object to the characteristics of the reflected signals. During a working mode, the trained neural network is to identify the position of the object based on reflected signals in working mode. Optionally, the reflected signals may be subject to a clustering process before input to the neural network.
Abstract:
A method, device and system for determining a DOA of a signal are described. Determination of the DOA of the signal may include receiving first and second UWB waveforms of the signal at one or more antennas of a UWB transceiver. A window may be defined in the first and second UWB waveforms such that the window is defined in a leading portion of the signal. First and second amplitude values of the respective first and second UWB waveforms in the window may be calculated. An amplitude ratio may be calculated with the first and second amplitude values and compared with calibration data to determine the DOA of the signal.
Abstract:
A method for generating a numeric or alpha-numeric identifier representative of a chemical structure having at least two atoms connected by a bond includes the step of assigning a numerical value to each atom and a numerical bond value to each bond. The method updates the numerical values for each atom based on the current values assigned to each atom and the numerical bond value. After the numerical values for each atom have been updated the method calculates a numeric or alpha-numeric identifier for the chemical structure.