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Nonorthogonal multi-carrier transmission method

A transmission method and non-orthogonal technology, applied in the field of multi-carrier transmission and wireless communication, can solve the problems of increased inter-symbol interference and high complexity of the receiving end

Inactive Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] GFDM divides the carrier into a block structure, and then replaces linear filtering with pulse-shaping filtering for each carrier to improve spectrum utilization, but it will lead to increased inter-carrier interference (ICI) and in

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Examples

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Embodiment 1

[0024] An embodiment of the present invention provides a non-orthogonal multi-carrier transmission method, see figure 1 , the method includes the following steps:

[0025] 101: Extend mutually orthogonal subcarriers in an OFDM system into non-orthogonal subcarriers with different sampling start times in multiple time domains;

[0026] 102: Combining multiple non-orthogonal subcarrier transmissions with compressed sensing, so that the signal mapped to the subcarrier is sparse, and obtaining the mapped signal;

[0027] Firstly, the carrier matrix is ​​used to obtain the sparse representation of the original input signal in the carrier matrix domain, and the dimension of the sparse representation signal is the same as the number of carriers; then the obtained sparse representation is mapped to the corresponding subcarriers for transmission .

[0028] 103: Recover the original signal through a reconstruction algorithm at the receiving end.

[0029] The receiving end first uses ...

Embodiment 2

[0032] Combined with the specific calculation formula, the appended figure 2 The scheme in Example 1 is further introduced, see the following description for details:

[0033] 201: Non-orthogonal multi-carrier design ideas;

[0034] Assuming that the system inputs N channels of QPSK symbols, N channels of orthogonal subcarriers are required for transmission in the OFDM system, and the symbol time domain sampling time is N.

[0035] In the embodiment of the present invention, to transmit N QPSK symbols, only K orthogonal subcarriers (KN), and the occupied spectrum resources are only is the bandwidth of K orthogonal subcarriers, which can improve spectrum utilization.

[0036] 202: Construction process of non-orthogonal multi-carrier system;

[0037] Among them, the k-th subcarrier in the K orthogonal subcarriers is extended to obtain M non-orthogonal subcarriers with the same frequency and different sampling times in the time domain. The waveform of the non-orthogonal subca...

Embodiment 3

[0044] Combine below image 3 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0045] like image 3 Shown is a system performance comparison chart of orthogonal multi-carrier transmission (OFDM) and non-orthogonal multi-carrier transmission proposed by the embodiment of the present invention, wherein the channels are all Rayleigh fading channels, and the input signals are all QPSK symbols. The OFDM system includes N=128 orthogonal sub-carriers, and the system symbol duration is N=128. The non-orthogonal multi-carrier transmission proposed in the embodiment of the present invention is under the same condition that the system symbol duration is N=128, with K= 64. Take the multi-carrier system with M=3 and the multi-carrier system with K=32 and M=7 as examples.

[0046] Depend on image 3 It can be seen that with the change of SNR conditions, the non-orthogonal multi-carrier transmission scheme proposed in t...

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Abstract

The invention discloses a nonorthogonal multi-carrier transmission method. The transmission method is based on a compressive sensing theory, and comprises the following steps of: expanding mutually orthogonal sub-carriers in an OFDM system into nonorthogonal sub-carriers with different sampling start time on a plurality of time domains; combining transmission of the plurality of nonorthogonal sub-carriers with compressive sensing, thus allowing signals mapped to the nonorthogonal sub-carriers to be sparse, and acquiring the mapped signals; and recovering the original signals at a receiving end via a restructing algorithm. According to the method provided by the invention, a total spectral bandwidth occupied by the carriers is reduced by nonorthogonality among the carriers at a same symbol rate, and spectrum efficiency of the nonorthogonal multi-carrier system is improved.

Description

technical field [0001] The invention relates to the field of multi-carrier transmission in the wireless communication field, in particular to a non-orthogonal multi-carrier transmission method. Background technique [0002] In response to emerging new business and application scenarios, the fifth generation mobile communication (5G) system is in full swing, requiring multi-carrier transmission systems to achieve higher spectrum utilization and energy efficiency, so OFDM technology is no longer suitable for 5G surroundings. [0003] To this end, researchers have proposed a variety of non-orthogonal multi-carrier transmission technologies as alternatives for 5G, among which filter bank multi-carrier (FBMC), universal filter multi-carrier (UFMC), and generalized frequency division multiplexing (GFDM) are Currently the most discussed multi-carrier transmission technology in the industry, the above three non-orthogonal multi-carrier transmission technologies are all based on fil...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2602H04L27/2627H04L27/2649
Inventor 付晓梅陈莉常帅张亮
Owner TIANJIN UNIV
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