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

Physical layer mode selection optimizing method for multi-carrier system

A multi-carrier system and mode selection technology, applied in the direction of multi-frequency code system, orthogonal multiplexing system, multiplexing communication, etc., can solve the problem of high signaling overhead, unappreciated and unapplied subcarrier allocation Algorithm complexity and other issues, to achieve the effect of improved throughput performance and easy implementation

Inactive Publication Date: 2011-02-02
SHANGHAI RES CENT FOR WIRELESS COMM
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the realization of this idea needs to optimally set a threshold value to determine which subcarriers are discarded, which will lead to a complex subcarrier allocation algorithm and a large signaling overhead
Therefore, this method has not been paid attention to and applied

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
  • Physical layer mode selection optimizing method for multi-carrier system
  • Physical layer mode selection optimizing method for multi-carrier system
  • Physical layer mode selection optimizing method for multi-carrier system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A multi-carrier system physical layer mode selection optimization method, comprising the following steps:

[0036] 1) Set the threshold σ threshold 2 ; When the instant channel frequency selective attenuation σ h(t) 2When it is higher than the threshold value, the high-profile and low-bit-rate combination method G under the same data transmission rate 2 The link performance is higher than that of low-profile high-bit-rate combination mode G 1 ; For a multi-carrier system, the difference between a frequency-selective fading channel and a flat fading channel such as an AWGN channel is that the attenuation forms experienced by subcarriers passing through the channel are different. In a frequency selective fading channel, G 2 It is possible to show more than G 1 Better link performance, which at least shows that when the frequency selectivity changes from no (zero) to a certain degree, prioritizing the decoding ability of the decoder will bring better link performance...

Embodiment 2

[0045] A multi-carrier system physical layer mode selection optimization method, adding a flag bit representing the change of channel attenuation to the signaling of the feedback link, and setting the threshold value σ threshold 2 ; When the instant channel frequency selective attenuation σ h(t) 2 When it is higher than the threshold value, the high-profile and low-bit-rate combination method G under the same data transmission rate 2 The link performance is higher than that of low-profile high-bit-rate combination mode G 1 ; If the instant channel characterizes the quantity of channel frequency selective fading characteristics σ inst 2 ≥ σ threshold 2 , Then set the flag bit to 1, G 2 is selected; otherwise, the flag is 0, G 1 be chosen. Compared with embodiment one, embodiment two needs to increase the signaling overhead of 1 bit (bit); G 1 with G 2 The select...

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

A method for selecting and optimizing the physical layer mode of multicarrier system comprises the following steps: 1) setting a threshold value sigmathreshold<2>; when instant channel frequency selective deamplification sigmah(t)<2> is higher than the threshold value, the link capacity of high-modulation low-code-rate combination mode G2 under the precondition of same data transmission rate is higher than that of the low-modulation high-code-rate combination mode G1; 2) traversing the channel to obtain the statistical property of selective deamplification of channel, calculating the appearing probability p1 of instant channel lower than sigmathreshold<2> and the appearing probability p2 of instant channel higher than sigmathreshold<2>; and 3) if p1>p2, selecting G1 as a mode supporting the data transmission rate; and otherwise G2 is selected. The method according to the invention has advantages of easy realization, no complexity adding of hardware realization or consumption of storing resource, and increasing the throughput capability of system.

Description

technical field [0001] The invention belongs to the field of orthogonal frequency division multiplexing multi-carrier technology, and in particular relates to a method for selecting a physical layer mode of a multi-carrier system. Background technique [0002] Link adaptation is one of the key technologies in the future mobile communication system. It aims to track real-time channel changes and automatically adjust some system parameters to improve spectrum efficiency under the premise of satisfying the system quality of service (QoS). For the physical layer, link adaptation is mainly embodied by adaptive modulation and coding technology, that is, according to the feedback channel quality indicator (CQI), on the premise that the packet error rate performance is satisfied, select the modulation method and code rate. The combination of modulation scheme and code rate is called physical layer mode. For example, the combination (QPSK, 1 / 2) indicates that the modulation method ...

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): H04J11/00H04L27/26
Inventor 邱赐云戎璐
Owner SHANGHAI RES CENT FOR WIRELESS COMM