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Signal emission and reception method of GFDM system based on weight fraction Fourier transform

A fractional Fourier, signal transmission technology, applied in digital transmission systems, transmission systems, multi-frequency code systems, etc., can solve problems such as interference and matrix operation complexity reduction, achieve low peak-to-average power ratio, excellent bit error rate The effect of rate performance

Inactive Publication Date: 2016-04-27
HARBIN INST OF TECH
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Problems solved by technology

[0004] In 2012, a low-complexity transmitter and receiver device was published in Document 2 ("Analysis of an alternative multi-carrier technique for next generation cellular systems" published by N.Michailow in 2012) and Document 3 ("LowComplexityGFDMReceiverBasedonSparseFrequencyDomainProcessing" published in 2013 by I. Gaspar) It is proposed that this device uses efficient FFT operations to greatly reduce the complexity of previous matrix operations, and the physical meaning of each step is more clear; at the receiving end, the sampling method of this new device is a matching receiving method, so it will Causes interference between subcarriers, in order to improve the performance of the system, a method of subcarrier interference elimination is needed to improve the performance of the system

Method used

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  • Signal emission and reception method of GFDM system based on weight fraction Fourier transform
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  • Signal emission and reception method of GFDM system based on weight fraction Fourier transform

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specific Embodiment approach 1

[0041] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, the signal transmission and reception method of the GFDM system based on weighted fractional Fourier transform,

[0042] The K subcarriers included in the GFDM system, each subcarrier has M subsymbols; K and M are positive integers;

[0043] The method includes the following steps:

[0044]Step 1. Perform the subcarrier order allocation operation at the transmitting end, that is, implement different WFRFT orders for the K subcarriers included in the original GFDM system and the M subsymbols on each subcarrier, so that it can be flexibly selected according to requirements Parameters, in the present invention, for the convenience of analysis and simplification of the system, the data on each subcarrier is all carried out the weighted fractional Fourier transform of -α order;

[0045] Step 2. Carry out subcarrier mapping, which can map subcarriers of different segments to different us...

specific Embodiment approach 2

[0050] Specific embodiment two, the signal transmitting and receiving method of the GFDM system based on weighted fractional Fourier transform,

[0051] Step 1: At the transmitter such as figure 1 Assuming that the same order of WFRFT transformation is performed on each subcarrier and the number of users is a single user, perform 1-α order WFRFT on the data on each subcarrier, and transform the data into the frequency domain ;

[0052] Step 2: Copy the data in the frequency domain and arrange them sequentially. The length of the current sequence is 2M, and use the RC shaping function to shape the signal with a length of 2M. After shaping, the middle data remains unchanged, and the data on both sides is 0. The intermediate data is in the shape of a "slope", and the length of the "slope" is related to the shaping function parameter β;

[0053] Step 3: At this time, the data length corresponding to each sub-carrier is 2M, and the data of each sub-carrier is superimposed and cor...

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Abstract

The invention discloses a signal emission and reception method of a GFDM system based on weight fraction Fourier transform, relating to the signal emission and reception technology of the GFDM system based on the weight fraction Fourier transform. The invention can obtain better bit error rate and reduces the peak-to-average power ratio. The invention can flexibly regulate the subcarrier and the WFRFT order in the unit carrier wave block according to the channel state information and user demands, and the order in each subcarrier can maintain different in order to achieve to the need of the system performance. Besides, the invention performs precoding through WFRFT and reasonably chooses the appropriate transformation order according to the channel condition, which enables the encoded system to obtain a better bit error rate performance and have lower peak-to-average power ratio.

Description

technical field [0001] The invention relates to the signal transmission and reception technology of the GFDM system based on weighted fractional Fourier transform. Background technique [0002] The GFDM carrier system is a new carrier system for future 5G technology. It is developed on the basis of OFDM technology and further evolved from filter multi-carrier technology. In the future 5G communication system, more and more attention will be paid to the combination of multiple scenarios, such as M2M and more dense and complex communication networks and heterogeneous networks, etc., and require higher transmission rates, shorter response times, and in limited Transmission of more data under spectrum resources is a challenge to the OFDM technology on which 4G technology is based. According to the requirements of 5G scenarios, the main disadvantages of OFDM technology are large out-of-band power radiation and lack of waveform flexibility. Larger out-of-band power radiation wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2614H04L27/2628H04L27/265
Inventor 梅林王震铎王晓鲁沙学军张乃通
Owner HARBIN INST OF TECH
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