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

Space-frequency linear coding method for OFDM system

A linear coding and space-frequency technology, which is applied in the transmission system, baseband system, multi-frequency code system, etc., can solve the problems of performance Doppler frequency shift, performance degradation, etc.

Active Publication Date: 2019-09-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the STLC-OFDM system is greatly affected by the Doppler frequency shift, and its performance will deteriorate sharply at high speeds

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
  • Space-frequency linear coding method for OFDM system
  • Space-frequency linear coding method for OFDM system
  • Space-frequency linear coding method for OFDM system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0031] Take N=1024, BPSK modulation as an example. The number of transmitting antennas is 1, and the number of receiving antennas is 2.

[0032] An OFDM symbol can be divided into 512 OFDM-IM sub-blocks, and each sub-block contains 2 subcarriers. Each sub-block uses X(r)=[x 1 (r)x 2 (r)] T Indicates that r=1,2,…,512. Specifically, there are the following steps:

[0033] Step 1: Obtain the channel information of the OFDM symbol

[0034] Step 2: Perform BPSK modulation on the transmitted bits, and the modulation symbol of each sub-block is represented by [s 1 (r)s 2 (r)] T .

[0035] Step 3: Perform space-frequency linear coding on the modulation symbols of the rth sub-block:

[0036]

[0037] in, Represents the average value of the channel information of the rth sub-block of the first receiving antenna; Indicates the average v...

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 belongs to the technical field of wireless communication, and particularly relates to a space-frequency linear coding method for an OFDM system. In the scheme provided by the invention, two continuous subcarrier symbols are subjected to space-frequency linear coding by using a channel center, and the sending information can be directly demodulated without channel information after the receiving information is linearly combined during detection. A simulation result shows that the provided SFLC-OFDM system is close to a traditional STLC-OFDM system and a traditional STBC-OFDM system, meanwhile, when Doppler frequency shift is increased, the system of the SFLC-OFDM system is hardly changed, and the performance of the STLC-OFDM system is sharply changed. Under the condition of high speed, the SFLC-OFDM is much better than the STLC-OFDM.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a space-frequency linear coding method for OFDM systems; the invention relates to space-frequency linear coding (Space-frequency Line Code, SFLC), space-time linear Code, STLC) and OFDM (Multiple Input Multiple Output, MIMO) and other technologies. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology is a high-speed transmission technology for wireless communication. Its basic principle is to decompose the high-speed data stream into many low-rate sub-data streams, that is, divide the signal into many orthogonal sub-carriers, and use these mutual Orthogonal subcarriers are transmitted simultaneously. This technology uses subcarriers to modulate data, expands the pulse width of symbols, can effectively resist inter-symbol interference (Inter-Symbol Interference, ISI), and improves the performance against multipath f...

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 Applications(China)
IPC IPC(8): H04L25/03H04L27/26H04L5/00
CPCH04L5/0007H04L25/03006H04L27/2601
Inventor 肖悦吴朝武刘男王金福李珣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA