OFDM signal transmission method for extended hybrid carrier precoding

A mixed carrier and signal transmission technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve problems such as poor performance, and achieve the effects of improving reliability, achieving anti-fading performance, and good bit error performance

Active Publication Date: 2021-04-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the poor performance of the existing multi-carrier communication method against channel fading under the condition of time-frequency double fading channel, and propose an OFDM signal transmission method with extended mixed carrier precoding

Method used

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  • OFDM signal transmission method for extended hybrid carrier precoding
  • OFDM signal transmission method for extended hybrid carrier precoding
  • OFDM signal transmission method for extended hybrid carrier precoding

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Experimental program
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specific Embodiment approach 1

[0064] Specific implementation mode one: as figure 1 shown. A method for transmitting an OFDM signal with extended hybrid carrier precoding described in this embodiment, the method specifically includes the following steps:

[0065] Step 1. After baseband constellation mapping is performed on the 0 and 1 bit data generated by the information source, the modulation result after constellation mapping is obtained;

[0066] Step 2. Group the modulation results obtained in step 1: starting from the first bit of the modulation result, divide the modulation result into M data blocks of equal length, and the length of each data block is L=2 N , N is a positive integer, and each data block corresponds to a frame of data, where: the i'th frame data is expressed as X i′ , i'=1,2,3,...,M, M is the total number of data blocks;

[0067] i'th frame data X i′ expressed as X i′ =[x 0 x 1 ...x L-1 ],x 0 、x 1 and x L-1 Respectively X i′ 1st, 2nd and 2nd in N data;

[0068] Step 3:...

specific Embodiment approach 2

[0094] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the extended hybrid carrier decoding matrix The expression is:

[0095]

[0096] f e -k is a matrix of L*L, F e -k The elements in row t and column t in Expressed as:

[0097]

[0098] θ 0 ∈[0,2π) is a transformation parameter, which is the same as that in Embodiment 1.

specific Embodiment approach 3

[0099] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in step seven, the analog modulation signal X obtained in step six T0 Perform up-conversion processing to obtain the signal after the up-conversion processing, the specific form of the signal after the up-conversion processing is:

[0100]

[0101] Among them, X T1 is the signal after up-conversion processing, f c Is the center frequency of carrier modulation, t is the timing mark, and Re[·] means to take the real part.

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Abstract

The invention discloses an OFDM signal transmission method for expanding hybrid carrier precoding, and belongs to the technical field of wireless communication. According to the invention, the problem that the existing multi-carrier communication method is poor in channel fading resistance under the condition of time-frequency double fading channels is solved. The invention designs a signal transmission method of an extended transform domain for an existing multicarrier communication system, and by performing extended hybrid carrier precoding on a modulated signal in front of an IDFT module, an extended hybrid carrier precoded OFDM signal with an energy averaging characteristic can be obtained. Under the channel condition with time dispersion, due to equalization processing on channel fading, the probability of complete loss of signal energy due to deep attenuation is greatly reduced, so that a receiving end can recover an original signal, a system has better error code performance, and the communication reliability of a multi-carrier system is effectively improved. Meanwhile, the method has good compatibility with other existing multi-carrier communication methods. The present invention can be applied to the technical field of wireless communications.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an OFDM signal transmission method with extended mixed carrier precoding. Background technique [0002] In the field of wireless communication, the multi-carrier system has been promoted and applied in various digital communication systems due to its advantages of high frequency band utilization and resistance to deep fading in the time domain. However, due to its poor performance against deep fading in the frequency domain, it makes There is still room for improvement in the performance of multi-carrier communication methods under poor channel conditions such as time-frequency double fading. In recent years, due to the characteristic of time-frequency energy averaging, the mixed-carrier modulation method based on weighted fractional Fourier transform has been gradually studied and used to improve the reliability of the existing multi-carrier system. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2634
Inventor 沙学军宋鸽房宵杰
Owner HARBIN INST OF TECH
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