4 results about "Chordal distance" patented technology

The application provides a wireless network planning method, device, equipment, medium and product, and belongs to the technical field of wireless communication. The method comprises the following steps: obtaining a first subset of users to be selected; performing chord distance calculation based on a first channel matrix and a second channel matrix to obtain a first distance set corresponding to each of a plurality of target users; performing chord distance calculation based on a third channel matrix and a fourth channel matrix to obtain a second distance set corresponding to each of the plurality of target users; determining a service user combination of each target user based on the first distance set and the second distance set of the target user; and performing wireless network analysis based on the plurality of service user combinations to obtain a wireless network planning result. The wireless network planning method provided by the application reduces the interference caused by inter-system co-frequency interference and inter-system cross-layer interference in wireless network planning, comprehensively reflects the real network, provides an actual theoretical basis for wireless network planning, and thus improves the accuracy of wireless network planning.

The invention relates to the technical field of data analysis and artificial intelligence, in particular to a historical data-based instrumental poem analysis method, which comprises the following steps of: acquiring multi-modal original data containing audio signals, instrumental work symbols and text evaluation data from a historical instrumental work database; performing standardized preprocessing to form a structured analysis data set; based on the data set, extracting multi-dimensional features such as timbre variance, force gradient, duration offset, pitch distribution, rhythm entropy, chord distance, emotion score and vocabulary distribution statistics, and constructing a comprehensive poem concept feature vector; and training the training set marked with the poem concept style label by using a deep neural network, constructing a poem concept analysis model, finally realizing poem concept quantitative scoring and style similarity calculation of the instrumental works, and visually outputting a result. According to the method, the defects of strong subjectivity and single dimension of attribute analysis of abstract instrumental works in the prior art are overcome, and objective, multi-dimensional and interpretable automatic analysis of poems and concepts of the instrumental works is realized.

The invention provides an incoherent SIMO short packet communication unitary constellation parameterization design and efficient detection method which is used for meeting the requirements for high reliability and low delay in SIMO system short packet communication. The method comprises the following steps: firstly, constructing a unitary constellation containing L symbols for any given transmission rate, and parameterizing the unitary constellation; secondly, taking the minimum chord distance in the maximized unitary constellation as an objective function, and establishing a quantitative relation between the objective function and the pairing error probability by analyzing the chord distance between different sending signals; then constellation structure design and bit allocation are carried out in a combined manner, and an optimal bit allocation scheme under different modulation orders is determined by using a minimum distance maximization criterion; and finally, at a receiving end, realizing efficient decoding of each parameter by using a low-complexity recursive incoherent maximum likelihood rapid detection algorithm. According to the invention, the constellation structure and bit distribution are jointly optimized, so that the requirements of high reliability and low delay in short packet communication of the SIMO system are met.

The application discloses a short code polar code encoding construction method based on polarization spectrum. In view of the problems of existing polar code construction in short packet non-coherent SIMO communication, such as dependence on channel state information and limitation of modulation order, a double-core mixed polar code encoding architecture is established, the Kronecker product of two-dimensional cores and arbitrary order cores is adopted, and high-order modulation of an arbitrary symbol mapping bit number is supported; an ordered weight sequence set is generated by calculating the minimum chord distance vector of a constellation diagram; a polarization spectrum statistic is proposed to describe the distribution of segmented weights after the ordering of code words in each sub-code auxiliary set under the condition of no channel state information; an optimization target is established based on the polarization spectrum, the chord distance and the number of receiving antennas, and the optimal information bit allocation is solved by using dynamic programming. Under the symbol level non-coherent SCL decoding, compared with the 5G NR polar code construction scheme and the coherent transmission scheme, the application significantly improves the block error rate performance and is suitable for short packet communication scenes with high mobility and low pilot overhead.