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Multi-band parallel filtering type hybrid carrier transmission method

A transmission method and hybrid carrier technology, applied in multi-carrier systems, transmission systems, digital transmission systems, etc., can solve the problems of high peak-to-average power ratio, increase bit error rate, amplify sub-carrier noise, etc., and reduce the peak-to-average power ratio. Effects of power ratio, improved bit error rate, high flexibility and applicability

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the noise on the sub-carriers at the edge of each sub-band will be amplified during the inverse filter process of the existing general-purpose filter multi-carrier system at the receiving end, which increases the bit error rate and the existing general-purpose filter The peak-to-average power ratio (PAPR) of the multi-carrier system is too high

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  • Multi-band parallel filtering type hybrid carrier transmission method
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  • Multi-band parallel filtering type hybrid carrier transmission method

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specific Embodiment approach 1

[0032] Specific implementation mode 1: see figure 1 This embodiment is described. In a multi-band parallel filtering hybrid carrier transmission method described in this embodiment, the transmitting end divides the transmitted baseband data into K subbands, and converts the data on each subband from the frequency domain to the time domain. Then, perform superposition and summation to obtain multi-carrier data, and after the multi-carrier data is subjected to up-conversion processing, it is sent to the receiving end as a transmission signal of the transmitting end;

[0033] The receiving end performs down-conversion processing on the received signal to obtain the down-converted baseband data, and then transforms the down-converted baseband data from the time domain to the frequency domain, and restores the data on each subband of the transmitting end;

[0034] At the transmitting end, after dividing into K subbands, the subband data on at least one channel needs to be precoded,...

specific Embodiment approach 2

[0043] Specific implementation two: see figure 1 This embodiment is described. The difference between this embodiment and the multi-band parallel filtering mixed-carrier transmission method described in Embodiment 1 is that the precoding is implemented by DFT (Discrete Fourier Transform), and the inverse precoding is implemented by using DFT (Discrete Fourier Transform). The coding is realized by IDFT (Inverse Discrete Fourier Transform, Inverse Discrete Fourier Transform).

specific Embodiment approach 3

[0044] Specific implementation mode three: see figure 1This embodiment is described. The difference between this embodiment and the multi-band parallel filtering hybrid carrier transmission method described in Embodiment 1 is that the up-conversion processing is to convert low-frequency signals into high-frequency signals, and the down-conversion processing is to convert low-frequency signals into high-frequency signals. High frequency signals are converted into low frequency signals.

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Abstract

The invention provides a multi-band parallel filtering type hybrid carrier transmission method and belongs to the field of multi-carrier transmission. The method solves the problems in the prior art that due to the fact that when an inverse filter is performed at the receiving end of an existing universal filtering multi-carrier system, the noise on each sub-carrier at the edge of a sub-band is amplified, so that the error rate is increased and the peak-to-average power ratio of the existing universal filtering multi-carrier system is too high. To-be-transmitted baseband data are divided into K sub-bands by a transmitting end, and the data of sub-bands of at least one access are pre-coded and then converted to a time domain. A receiving end converts the baseband data after down-conversion from the time domain to the frequency domain, and then the data of each sub-band of the transmitting end are recovered. After that, the data of each sub-band of the transmitting end also need to be subjected to inverse pre-coding. The pre-coding is used for transmitting the data of sub-bands in a single-carrier mode, and is also used for converting the data of sub-bands from the time domain to the frequency domain. The inverse pre-coding is used for converting the symbol decision position of the data of each sub-band from the frequency domain to the time domain. The method is mainly used for multi-band parallel filtering type transmission.

Description

technical field [0001] The invention belongs to the field of hybrid carrier transmission. Background technique [0002] OFDM technology is widely used in modern communication systems because of its high spectral efficiency and strong resistance to multipath fading. Due to its high sidelobe power, the synchronization requirements for transmission are very strict. In order to suppress the out-of-band power and reduce the synchronization requirements of the system, scholars have proposed many techniques. Such as filter bank multi-carrier (FBMC), filtered OFDM (Filtered-OFDM), generalized frequency division multiplexing (GFDM) and universal filter multi-carrier (UFMC) and so on. [0003] Among these technologies, the universal filtering multi-carrier technology has attracted the attention of many scholars due to its effective suppression of out-of-band spectral leakage, higher flexibility, and lower complexity while maintaining the orthogonality between carriers. However, the...

Claims

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Application Information

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IPC IPC(8): H04L27/34
CPCH04L27/3411
Inventor 梅林崔世鸿王震铎王晓鲁沙学军
Owner HARBIN INST OF TECH
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