Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Methods of Pilot Transmission, Channel Estimation and Noise Power Estimation in ofdm System

A transmission method and channel estimation technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as CIR energy leakage

Inactive Publication Date: 2011-12-28
POTEVIO INFORMATION TECH CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, in a communication system using OFDM as the main multiple access technology, since the system bandwidth is usually shared by multiple users, for any user, the ratio between the total number of system subcarriers N and the number of occupied system subcarriers M The difference between them will be larger, so the energy leakage problem of CIR is also more serious

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
  • Methods of Pilot Transmission, Channel Estimation and Noise Power Estimation in ofdm System
  • Methods of Pilot Transmission, Channel Estimation and Noise Power Estimation in ofdm System
  • Methods of Pilot Transmission, Channel Estimation and Noise Power Estimation in ofdm System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] The basic idea of ​​the present invention is to process the transmitted pilot frequency through frequency domain windowing, thereby greatly reducing the out-of-band leakage of the time domain response of the corresponding channel.

[0033] Figure 4 It is a schematic diagram of the sending end performing pilot signal transmission and the receiving end performing noise power estimation and channel estimation in the present invention.

[0034] Specifically, it is assumed that the number of pilots transmitted by the system is M p , the processing operations for the pilot signal at the sending end include:

[0035] Step 101: Generate pilot sequence X(k), k=0,...,M p -1.

[0036] Step 102: Select a window function sequence, and perform windowing processing on ...

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 discloses a method for sending a pilot signal in an OFDM system. The pilot sequence is sent after performing frequency domain windowing processing. The present invention also discloses a channel estimation method and a noise power estimation method. The pilot signal processed by frequency domain windowing is received, and the channel estimation is performed according to the unwindowed pilot sequence to determine the frequency domain channel on each subcarrier corresponding to a user. Respond to the initial value and use the corresponding channel time domain response to calculate the signal power of the channel time domain response whose index value is greater than NCP-W in the channel time domain response, as the noise power of the system; the index value in the channel time domain response is greater than NCP-W The channel time domain response value of W is set to 0, the denoising processing of channel estimation is completed, and the denoising processed CIR is subjected to Fourier transform and window removal processing to obtain the final frequency domain channel response of each subcarrier. By applying the present invention, the accuracy of noise power estimation and channel estimation can be improved.

Description

technical field [0001] The present invention relates to technology in Orthogonal Frequency Division Multiplexing (OFDM) system, in particular to a pilot transmission method, a channel estimation method and a noise power estimation method in the OFDM system. Background technique [0002] OFDM technology is a multi-carrier digital modulation technology. Due to its high spectrum utilization, low cost, and good performance in multipath and mobile environments, OFDM technology is widely used in digital audio and video broadcasting, wireless local area network, LTE and other communication systems. [0003] OFDM technology uses multiple carriers with mutual orthogonal characteristics to improve frequency utilization. At the same time, through figure 1 The shown method of inserting a cyclic prefix (CP) effectively suppresses intersymbol interference caused by multipath. OFDM converts the high-rate data stream through serial-to-parallel conversion, so that the data symbol duration...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 陆涛雷旭胡炜
Owner POTEVIO INFORMATION TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com