Unlock instant, AI-driven research and patent intelligence for your innovation.

OFDM (Orthogonal Frequency Division Multiplexing) ultra wide band system compressed sampling method based on compressed sensing

A technology of compressed sampling and compressed sensing, which is applied in the field of wireless communication, and can solve problems such as unfavorable hardware implementation and high-order numbers of analog filters

Inactive Publication Date: 2016-12-07
TIANJIN POLYTECHNIC UNIV
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to accurately reconstruct the original signal, this structure requires the analog filter to have a higher order, which is not conducive to hardware implementation

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
  • OFDM (Orthogonal Frequency Division Multiplexing) ultra wide band system compressed sampling method based on compressed sensing
  • OFDM (Orthogonal Frequency Division Multiplexing) ultra wide band system compressed sampling method based on compressed sensing
  • OFDM (Orthogonal Frequency Division Multiplexing) ultra wide band system compressed sampling method based on compressed sensing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The gist of the present invention is to propose a compressed sampling method based on compressed sensing for OFDM ultra-wideband systems. On the basis of establishing a segmented observation model, an optimized parallel segmented compressed sampling (OPSCS) scheme based on Hadamard matrix is ​​proposed, which effectively realizes the OFDM ultra-wideband system. Compressed sampling for wideband systems, while having good anti-noise capability.

[0020] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] 1. Construction of compressed sampling model of OFDM signal based on compressed sensing

[0022] In OFDM system, frequency domain signal X=[X 0 , X 1 ,...,X N-1 ] T The time-domain signal modulated by IDFT can be expressed as

[0023] x n = 1 N Σ k =...

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

No PUM Login to View More

Abstract

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) ultra wide band system compressed sampling method based on compressed sensing, belongs to the technical field of wireless communication, and aims at providing an optimization parallel segmented compressed sensing (OPSCS) scheme based on a Hadamard matrix according to an established segmented observation model, for a high-speed sampling problem of an OFDM ultra wide band system. The method is technically characterized in that a segmented observation matrix of any dimension is established by employing the Hadamard matrix, multiple ways of orthogonal or quasiorthogonal observing sequences are obtained, and a restricted isometry property is improved; and through adoption of a simplified orthogonal matching pursuit algorithm, iterative operation is avoided. According to the method, compressed sampling of the OFDM ultra wide band system is effectively realized, moreover, the method has the advantage of high noise immunity, and the system performance superior to that realized through adoption of existing compressed sampling and even Nyquist rate sampling can be realized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a compression sampling method for an OFDM ultra-wideband system based on compressed sensing. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) has the advantages of high frequency band utilization, strong anti-symbol crosstalk ability, strong anti-frequency selective fading ability, etc., and is the core of high-speed wireless communication field. [0003] In the current information age, people's demand for communication information is increasing day by day. OFDM technology and multi-antenna technology can improve the frequency band utilization of the system to a certain extent. Improving the transmission rate is the most direct and effective method. 3-10GHz is the first frequency band to support ultra-wideband (UWB) communications, supporting data rates up to 480Mbps. The 60GHz frequency band can realize ultra-high-speed...

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
no application Login to View More
IPC IPC(8): H03M7/30
CPCH03M7/3062
Inventor 张华陈明省戈立军程以泰
Owner TIANJIN POLYTECHNIC UNIV