OFDM access based reverse signal transmitting-receiving method and apparatus

An orthogonal frequency division multiple access and reverse signal technology, applied in the field of mobile communication, can solve the problem that the destruction of the orthogonality of Walsh codes cannot be completely eliminated, etc.

Inactive Publication Date: 2010-01-27
HUAWEI TECH CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although by adding a channel interleaver, randomizing the angle spread of channel fading in high-speed channels can improve the performance under high-speed conditions, but it still cannot completely eliminate the damage to the orthogonality of Walsh codes caused by high-speed mobile channel fading. Performance improvements are limited

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 access based reverse signal transmitting-receiving method and apparatus
  • OFDM access based reverse signal transmitting-receiving method and apparatus
  • OFDM access based reverse signal transmitting-receiving method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0142] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0143] The core of the present invention is to pre-divide the physical channel resources used to carry the control channel in a physical frame into smaller time-frequency blocks, each time-frequency block consists of consecutive subcarriers and consecutive symbols less than one physical frame The number of OFDM symbols in each time-frequency block is determined according to the maximum design speed of the terminal in the cell. For example, if the maximum design speed of the terminal in the cell is 200-400 km / h, the time-frequency block consists of continuous subcarriers and continuous OFDM symbols less than or equal to 4; if the maximum design speed of the terminal in the cell If the speed is greater than 400 km / h, the time-frequency block consists of continuous s...

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 mobile communication field, discloses a receiving and transmitting method for backward signal based on orthogonal frequency division multiple access and a device thereof, the performance of backward control channels can be improved greatly in condition of high speed channel, multipath search and relative complexity of the receiving end are reduced. The invention changes resource structure of backward control channels, divides a backward channel resource block into smaller blocks, terminal signals can be transmited in the smaller time-frequency blocks, the effect of quickly changed channels to the backward control channels can be reduced. The terminal selects time-frequency blocks for bearing signals thereof randomly or according to MAC ID to make number of users beared by each time-frequency block be even. If the length of signals to be transmited is less than the predetermined length, the signals to be transmited are error correction coded and interlaced, corresponding error correction coding is done on the receiving end.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to Orthogonal Frequency Multiple Access (Orthogonal Frequency Multiple Access, "OFDMA") technology. Background technique [0002] In recent years, a multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, "OFDM") has attracted widespread attention. Multi-carrier transmission decomposes a data stream into several independent sub-streams, each of which will have a much lower bit rate. Using the low-rate multi-state symbols formed at such a low bit rate to modulate the corresponding subcarriers constitutes a transmission system in which multiple low-rate symbols are sent in parallel. [0003] As a multiplexing technique, OFDM multiplexes multiple signals on different orthogonal subcarriers. The traditional frequency division multiplexing (Frequency Division Multiplexing, referred to as "FD...

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): H04Q7/38H04Q7/32H04L27/26
CPCH04L27/2647H04L27/2626H04J13/004H04J13/16H04L5/0021
Inventor 李斌阮卫罗毅杜颖钢夏林峰薛丽霞
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap