5 results about "Hadamard transform" patented technology

An orthogonal time sequency multiplexing (OTSM)-based communication method includes generating a plurality of candidate matrices in a delay-time domain by multiplying data in row units in a delay-sequency domain by a plurality of preset scrambled Walsh-Hadamard transform (S-WHT) matrices or generating a plurality of candidate matrices in a delay-time domain by scrambling the data in row units in the delay-sequency domain by using a plurality of preset scramble vectors and then multiplying the scrambled data by the S-WHT matrices, and generating a data matrix in the delay-time domain based on the plurality of candidate matrices.

A video encoding method and apparatus for calculating a sum of absolute transformed difference (SATD) through a folded Hadamard transform circuit includes partitioning a current block into SATD blocks, receiving input data associated with a first block of a first SATD block in a first cycle and input data associated with a second block of the first SATD block in a second cycle, and performing a calculation of the first block by a shared Hadamard transform circuit in the first cycle and a calculation of the second block by the shared Hadamard transform circuit in the second cycle. Each shared Hadamard transform circuit is a first portion of each folded Hadamard transform circuit. The video encoding method and apparatus further perform a calculation of an entire SATD block through a final portion of each folded Hadamard transform circuit to generate a final SATD result for the first SATD block for encoding.

This invention belongs to the field of wireless communication and array signal processing technology, specifically relating to a low-precision phase shifter codebook design method suitable for near-field MIMO. Addressing the problems of large size, high computational complexity, and strong dependence on high-precision phase shifters in traditional angle-range domain codebooks in near-field hybrid precoding, this invention constructs a low-precision analog domain codebook based on the complex Hadamard transform of conjugate symmetric sequences, ensuring that codeword elements are taken only from [specific data type], thus supporting 2-bit phase shifter implementation. Furthermore, it improves beam coverage density by constructing an overcomplete codebook and combines it with a virtual subarray structure to perform beam selection at the subarray scale to adapt to the propagation characteristics of near-field spherical waves. This invention achieves good precoding performance under near-field and spatially non-stationary channel conditions while reducing hardware cost and power consumption, making it suitable for ultra-large-scale MIMO and near-field hybrid precoding systems.

A computer-implemented method is presented for performing a computation with a neural network. The method includes: receiving a first input patch of data; applying a Walsh-Hadamard transform to the input patch to yield a transformed input patch in a transformed domain; computing an element-wise product of the transformed input patch and a kernel of the neural network; applying an inverse Walsh-Hadamard transform to the element-wise product to yield an intermediate matrix; and creating a first output patch from the intermediate matrix, where the size of the first output patch is smaller than the intermediate matrix.