Same-frequency multi-waveform high-capacity multi-carrier modulation method

A multi-carrier modulation and large-capacity technology, applied in the modulation carrier system, multi-frequency code system, digital transmission system, etc., can solve the problems of peak-to-average power ratio, hinder development, high sensitivity to frequency offset and phase noise, and achieve expansion Quantity, reduced reliability, increased spectrum utilization and effect of symbol transmission rate

Inactive Publication Date: 2016-11-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the increasingly tight spectrum resources, the requirements for spectrum utilization are getting higher and higher, coupled with the shortcomings of OFDM, such as: high peak-to-average power ratio, high sensitivity to frequency offset and phase noise, etc., seriously hinder its further development

Method used

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  • Same-frequency multi-waveform high-capacity multi-carrier modulation method

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Embodiment 1

[0022] A large-capacity multi-carrier modulation method with multiple waves at the same frequency, see figure 1 , the large-capacity multi-carrier modulation method includes the following steps:

[0023] 101: expand each frequency subcarrier to m subcarriers with the same frequency but different waveforms;

[0024] That is, r subcarriers are expanded into r*m subcarriers; N subcarriers are used when transmitting N signals, and only the frequency resources occupied by r=N / m subcarriers need to be occupied;

[0025] 102: For the nth subcarrier Perform scale and time-shift transformations;

[0026] Among them, the results of scale and time shift transformation are:

[0027] get the form as Where k=0,1,...,r,r+1,...,sr-1, s is the aliasing coefficient, ir / m is the delay factor, i=0,1,...m- 1 is the serial number of the same frequency subcarrier;

[0028] 103: The signal modulated to the subcarrier is demodulated at the receiving end through the reconstruction algorithm in ...

Embodiment 2

[0031] Combine below figure 1 and figure 2 The scheme in embodiment 1 is introduced in detail, see the description below for details:

[0032] 201: Design of multi-wave subcarriers at the same frequency;

[0033] Assuming that there are N channels of signals to be transmitted, N subcarriers are required, and traditional multi-carrier modulation requires N orthogonal carrier frequencies. In the embodiment of the present invention, each frequency subcarrier is expanded into m subcarriers of the same frequency but with different waveforms (that is, different delay parameters). Therefore, when N subcarriers are used to transmit N signals, it only needs to occupy frequency resources occupied by r=N / m orthogonal subcarriers, thereby effectively improving frequency band utilization.

[0034] 202: Select r orthogonal subcarriers, and transform each subcarrier;

[0035] For example: for the nth (n=0, 1, ..., r-1) subcarrier Perform scale and time-shift transformations to obtain ...

Embodiment 3

[0041] Combine below image 3 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0042] image 3 Given that the aliasing parameter s is 1.5 and the number of co-frequency carriers is m=8, the sinusoidal signal is used as the original signal (signal), and the reconstructed signal at the receiving end is (AE-Fourier Base).

[0043] image 3 The original signal and the reconstructed signal in almost coincide, from image 3 It can be seen that this method can better restore the original signal, so this method can improve the effect of spectrum utilization without reducing the reliability of transmission.

[0044] Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the serial numbers of the above-mentioned embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodime...

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Abstract

The invention discloses a same-frequency multi-waveform high-capacity multi-carrier modulation method. The high-capacity multi-carrier modulation method comprises the following steps of: expanding various frequency sub-carriers into m same-frequency multi-waveform sub-carriers, which are same in frequency and different in waveform, namely, expanding r sub-carriers into r*m sub-carriers; adopting N sub-carriers while transmitting N-channel signals, wherein frequency resources occupied by r=N/m sub-carriers are only occupied; performing scale and time shifting conversion of the nth sub-carrier; and demodulating signals modulated on the sub-carriers at a receiving end through a reconstruction algorithm in a compressive sensing theory, reducing inter-carrier interference by utilizing a matching tracking algorithm, and realizing demodulation of signals. According to the same-frequency multi-waveform high-capacity multi-carrier modulation method disclosed by the invention, under the condition that the bandwidth is constant, various sub-carriers are expanded into coherent sub-carriers, which are same in frequency and different in waveform (same-frequency multi-waveform); interference of same frequencies between carriers is eliminated at the receiving end by utilizing the reconstruction algorithm; therefore, the number of the sub-carriers is enlarged; and the spectrum utilization rate and the symbol transmission rate are effectively increased.

Description

technical field [0001] The invention relates to multi-carrier modulation in the field of wireless communication, in particular to a large-capacity multi-carrier modulation method with the same frequency and multiple waves. Under the same bandwidth, the method can increase the transmission rate by several times compared with traditional multi-carrier modulation. Background technique [0002] Wireless communication modulation technology can be divided into single-carrier modulation and multi-carrier modulation. Multi-carrier modulation is widely used in broadband wireless communication to meet the needs of high-speed data transmission. The basic idea is to divide the bit stream into multiple different sub-data streams for modulation. transmission on several carriers. [0003] At present, the common multi-carrier modulation technologies mainly include Orthogonal Frequency Division Multiplexing (OFDM) system and filter-based multi-carrier modulation system. , frequency selectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2627H04L27/2691
Inventor 付晓梅陈莉邢娜
Owner TIANJIN UNIV
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