Subcarrier Mapping Method Using Compressed Spectrum in Multicarrier 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: 2016-11-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • 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

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  • Subcarrier Mapping Method Using Compressed Spectrum in Multicarrier Frequency Shift Keying System
  • Subcarrier Mapping Method Using Compressed Spectrum in Multicarrier Frequency Shift Keying System
  • Subcarrier Mapping Method Using Compressed Spectrum in Multicarrier Frequency Shift Keying System

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Experimental program
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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.

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Abstract

The invention belongs to a method for subcarrier mapping by using compressed frequency spectrum in a multi-carrier frequency shift keying system in the technical field of wireless communication. Including transmitter: symbol mapping, serial-parallel conversion, compressed sub-channel carrier mapping, frequency-time conversion processing, up-conversion processing and signal transmission; and receiving end: signal reception and down-conversion processing, time-frequency conversion processing, compressed sub-channel Carrier demapping, parallel conversion, symbol demapping. The invention uses compressed spectrum technology to compress the minimum sub-channel interval to Δf=α / Ts, increasing the number of sub-channels to 1 / α times of the original, and adopts sub-channel carrier mapping with an interval of α·Δf; under the same conditions Compared with the conventional MC-MFSK system, the bit signal-to-noise ratio of the MC-MFSK system of the present invention is increased by 1-1.2dB (equivalent to improving the data transmission capacity by 26-31%). Therefore, it has the characteristics of greatly improving the spectrum utilization rate of each subcarrier spectrum in the system and the MC-MFSK system, as well as the data transmission capability and efficiency of multi-carrier wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for subcarrier mapping by using compressed spectrum in a multi-carrier frequency shift keying (MC-MFSK, Multi CarrierM-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 Xiaoh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/10
Inventor 董彬虹宋延光周兰林邹洋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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