Weighted score Fourier transform time-spreading transmission method in simultaneous system
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A fractional Fourier, synchronous system technology, applied in the field of weighted fractional Fourier transform time-expanded transmission technology, can solve problems such as multi-user scenarios not considered
Active Publication Date: 2015-09-16
HARBIN INST OF TECH
View PDF5 Cites 12 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, this method is only suitable for single-user
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment approach 1
[0069] Specific implementation mode 1. Combination figure 1 , figure 2 and Figure 4 Illustrate this specific embodiment, weighted fractional Fourier transform time-spreading transmission method in the synchronous system, it is realized by the following steps:
[0070] The present invention considers the use of weighted fractional Fourier transform with a length of N for processing, and N is a positive integer; assuming that the type of data service processed by the base station central system is M, M is a positive integer, and M≤N, the first data from service i k bits or sign information is represented by D i k =±a i k ±jb i k (i=1,2,3,...,M) means;
[0071] Step A1. The central base station preprocesses the data symbols from M services, and different service data are allocated to different communication time slots. The specific allocation method is as follows figure 2 shown. The assigned signal form satisfies:
[0072] S k ...
specific Embodiment approach 2
[0093] Specific embodiment two, combine image 3 and Figure 4 Illustrate this specific implementation mode, weighted fractional Fourier transform time-spreading transmission method in the synchronous system, this method adopts the weighted fractional Fourier transform of length N to process, and N is a positive integer; Suppose the data service type handled by the base station central system is M, M is a positive integer, and M≤N; the kth bit or symbol information of the data from service i is determined by D i k =±a i k ±jb i k Express; i=1,2,3,...,M; where: a is the real part data; b is the imaginary part data; j is the symbol of the imaginary part; k is a positive integer;
[0094] Step C1. Map the data bits or symbol information from different services to different subcarrier positions in the weighted domain. In the time domain, the signal after the data mapping of service i satisfies the relationship:
[0095] S i ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
A weighted score Fourier transform time-spreading transmission method in a simultaneous system relates to the communication field. The weighted score Fourier transform time-spreading transmission method is used for resisting the decline of an information channel and improving transmission capacity. A transmitting terminal of a first solution is as follows: a central base station preprocesses data symbols from M businesses and distributes different business data to different communication time slots, performs series/parallel conversion to the data symbols from the M businesses, performs N-point weighted score Fourier transform, and transmits to the information channel after performing parallel/series conversion, modulating and filtering; a reflecting end of a second solution is as follows: the reflecting end maps data bit or symbol information from different businesses to different weighted region sub-carrier positions, performs signal combination to M signals after respectively performing N-point weighted score Fourier transform and transmits to the information channel after performing parallel/series conversion, modulating and filtering. The method of the invention is applied to the weighted score Fourier transform time-spreading transmission in the simultaneous system.
Description
technical field [0001] The invention relates to the communication field, in particular to the weighted fractional Fourier transform time-spreading transmission technology in a synchronous system. Background technique [0002] Fractional Fourier Transform (FRFT) is an important time-frequency analysis tool. It has been widely studied in recent years and has been applied in some engineering technology fields. FRFT is an extension of the traditional Fourier transform. Its fundamental The characteristics can be understood as the fractionalization of Fourier transform eigenvalues, the continuity of parameter values, the addition of rotations and the unity of the time-frequency form of signals are the basic properties of FRFT. Due to the different ways of scoring the eigenvalues and the broad constraints on the properties of FRFT, FRFT has many different forms of definition. According to their respective starting points and basic characteristics, these definitions can be roughl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more