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

Sub-carrier mapping method adopting compressed spectrum in multi-carrier frequency-shift keying system

A frequency-shift keying system and sub-carrier mapping technology, applied in multi-frequency code systems, FM carrier systems, etc., can solve problems such as affecting spectrum utilization and data transmission capabilities, low spectrum utilization of a single carrier, and easy to cause problems. Achieve the effect of improving data transmission capacity and efficiency, improving spectrum utilization, and overcoming spectrum leakage

Inactive Publication Date: 2013-09-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned technology still has defects such as the low spectrum utilization rate of a single carrier, which affects the further improvement of the spectrum utilization rate and data transmission capacity of the entire MC-MFSK system, and is easy to cause

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
  • Sub-carrier mapping method adopting compressed spectrum in multi-carrier frequency-shift keying system
  • Sub-carrier mapping method adopting compressed spectrum in multi-carrier frequency-shift keying system
  • Sub-carrier mapping method adopting compressed spectrum in multi-carrier frequency-shift keying system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The working frequency band of the system is: 11MHz~11.32MHz in the shortwave frequency band (2~30MHz) is the working frequency band;

[0040] Minimum interval between subchannels: select T s =200μs, compression rate α=1 / 2, minimum sub-channel interval is α / T s =2.5KHz, evenly select N=(11.32-11)MHz / 2.5KHz=128 sub-channels as the working frequency band for signal transmission and reception in this embodiment;

[0041]The number of data bits carried by each subcarrier (BPC, Bit Per Carrier): 4bit;

[0042] Number of subchannels per subcarrier: M=2 BPC =16;

[0043] The number of subcarriers on the working frequency band: m=N / M=8;

[0044] Source data: 10000000 randomly generated binary bit data is used as the source, and each 32bit is used as a source data packet;

[0045] Wireless Channel Environment: Conducted in shortwave fading channel.

[0046] The specific mapping method of this embodiment is:

[0047] Transmitter A

[0048] Step A-1. Symbol mapping: The dat...

Embodiment 2

[0061] The frequency spectrum compression rate α=1 / 4 of this embodiment, BPC=5, M=32 in the MC-MFSK system of compressing frequency spectrum at this moment; The rest are all the same as embodiment 1; Through emulation operation: MC-MFSK system of this embodiment Compared with the conventional MC-MFSK system, the bit signal-to-noise ratio performance is improved by 1.2dB (equivalent to a 31% increase in data transmission capacity); the comparison of the simulation operation effect curve can also be found in Figure 5 the corresponding section shown.

Embodiment 3

[0063] The frequency spectrum compression rate α=1 / 8 of this embodiment, BPC=6, M=64 in the MC-MFSK system of compressing frequency spectrum at this moment; The rest are all the same as embodiment 1; Through emulation operation: MC-MFSK system of this embodiment Compared with the conventional MC-MFSK system, the bit signal-to-noise ratio performance is improved by 1.21dB; the comparison of simulation operation effect curves can also be found in Figure 5 the corresponding section shown.

[0064] Now because the interference between multiple carriers increases, the rate of improvement of the data transmission capability of its multi-carrier frequency shift keying system is limited, that is, it only improves 0.01dB compared with Embodiment 2, which is of little significance; thus the best frequency spectrum of the present invention The compression rate is 1 / 4≤α≤1 / 2.

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 performing sub-carrier mapping by adopting a compressed spectrum in a multi-carrier frequency-shift keying system, belonging to the technical field of wireless communication. The method comprises the steps that: a transmitting end carries out symbol mapping, serial-to-parallel conversion, compressed sub-channel carrier mapping, frequency-time conversion treatment, up-conversion treatment and signal transmission ; and a receiving end carries out signal reception and down-conversion treatment, time-frequency conversion treatment, compressed sub-channel carrier inverse mapping, parallel-serial conversion and symbol mapping. As a compressed spectrum technology is adopted to compress a minimum sub-channel gap to deltaf=alpha / Ts, the number of the sub-channels is increased to 1 / alpha of the original number, and the sub-channel carrier mapping with the gap of alpha*deltaf is adopted; at the presence of the same conditions, the bit SNR (Signal to Noise Ratio) of the MC-MFSK (Multi-Carrier and Multi-Frequency Shift Keying) system is improved by 1-1.2 dB than that of a regular MC-MFSK system (equivalently, the data transmission capability is improved by 26-31%). Therefore, the method for performing the sub-carrier mapping by adopting the compressed spectrum in the multi-carrier frequency-shift keying system has the characteristics of greatly improving the spectrum utilization rate of each sub-carrier spectrum and the MC-MFSK system, the data transmission capability and efficiency of the multi-carrier wireless communication, and the like.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for subcarrier mapping using compressed spectrum in a multi-carrier frequency shift keying (MC-MFSK, Multi Carrier M-ary Frequency Shift Keying) system. Background technique [0002] In wireless communication technology, spectrum is the most precious resource. Multi-carrier wireless communication technology allocates serial high-speed data streams to each sub-carrier for parallel transmission, which improves spectrum utilization (that is, every second and every Hz can transmit the number of bits). However, spectrum resources are limited after all, so improving the spectrum utilization rate of multi-carrier wireless communication technology is our unremitting goal. [0003] In the article "Multi-carrier MFSK Underwater Acoustic Communication Method Based on IFFT / FFT" ("Acoustic Technology" Aug., 2008, Vol.27, No4: 231-234, Authors: Shen Xiaohon...

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): H04L27/26H04L27/10
Inventor 董彬虹宋延光周兰林邹洋
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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