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Cyclic prefix free filtering hybrid carrier continuous stream transmission method based on fast convolution

A technology with no cyclic prefix and mixed carriers, applied in radio transmission systems, transmission systems, digital transmission systems, etc., can solve the problems of low spectrum efficiency and high out-of-band leakage, and achieve improved spectrum efficiency, low complexity, and suppression of out-of-band leaked effect

Active Publication Date: 2018-12-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of high out-of-band leakage in the existing method, and the existing method is to transmit in "blocks", adding a cyclic prefix before each mixed carrier symbol, resulting in low spectrum efficiency, and proposes a fast convolution-based Mixed Carrier Continuous Stream Transmission Method without Cyclic Prefix Filtering

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  • Cyclic prefix free filtering hybrid carrier continuous stream transmission method based on fast convolution
  • Cyclic prefix free filtering hybrid carrier continuous stream transmission method based on fast convolution
  • Cyclic prefix free filtering hybrid carrier continuous stream transmission method based on fast convolution

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specific Embodiment approach 1

[0029] Specific embodiment 1: The non-cyclic prefix filtering mixed carrier continuous stream transmission method based on fast convolution includes the following steps:

[0030] The system structure proposed by the present invention is as figure 1 shown. The transmitter part consists of a set of interpolation filters and the receiver part consists of a set of corresponding sampling filters. The core of the patent is that each subband at the transmitting end can select a different modulation order for WFRFT precoding. After each subband at the receiving end undergoes matched filtering and equalization processing, the corresponding subband is subjected to inverse precoding processing, so that the symbol judgment The position is transformed from the time domain to the fractional domain. The operation of precoding makes the selection of the waveform flexible. According to different detection algorithms, selecting the optimal modulation order α can make the bit error performance...

specific Embodiment approach 2

[0057] Specific embodiment 2: the difference between this embodiment and specific embodiment 1 is: in the step 1, D k According to a given length Q, it is divided into P segments, and the P segment data stream is precoded with a precoding matrix to obtain the encoded data p=1,2,...,P, and then splicing the P segment precoded data into a continuous data stream s k The specific process of (n) is:

[0058] D. k =[D T k,1 D. T k,2 …D T k,P ] T

[0059] D. k,p =[D k,p (0)D k,p (1)...D k,p (Q-1)] T

[0060]

[0061]

[0062] where s k for s k Vector representation of (n); D T k,1 Represents the transposition of the data signal of the first segment of the kth subband; D T k,2 Represents the transposition of the data signal of the first segment of the kth subband; D T k,P Represents the transposition of the data signal of the k-th sub-band P-th segment; D k,p (0) represents the first data signal point in the data signal of the k-th sub-band p-th segment...

specific Embodiment approach 3

[0072] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: if Figure 10 As shown, three consecutive non-overlapping block signals s are taken out in the second step k,q-1 ,s k,q ,s k,q+1 middle N of k,b symbols to obtain overlapping block signals The expression is:

[0073]

[0074] Among them, R b overlap block matrix for the transmitter, for N k,b The identity matrix of order, denote 2L k,s is the number of overlapping samples between adjacent overlapping block signals, then N k,b =L k,b +2L k,s ; The present invention takes L k,s =L k,b / 2, which is N k,b = 2L k,b ; It is worth pointing out that the 2L k,s The length of can be designed in combination with the time-domain response length of the filter, which is not the focus of the present invention and will not be discussed.

[0075] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a cyclic prefix free filtering hybrid carrier continuous stream transmission method based on fast convolution in the field of wireless communication. By adoption of the cyclic prefix free filtering hybrid carrier continuous stream transmission method provided by the invention, the problems that the out of band leakage of the existing method is high, and that a cyclic prefixis added in front of each hybrid carrier symbol in the existing method, resulting in low spectral efficiency can be solved. According to the cyclic prefix free filtering hybrid carrier continuous stream transmission method provided by the invention, a plurality of sub-bands are simultaneously transmitted in parallel, and each sub-band is mapped onto different frequency bands via filtering after being subjected to weighted Fourier transform preprocessing. According to the cyclic prefix free filtering hybrid carrier continuous stream transmission method provided by the invention, the filtering is completed by fast convolution, and the out of band leakage of the sub-bands can be effectively inhibited. Each sub-band can flexibly select a sub-band width and set different weighted Fourier transform modulation orders. The modulation orders of different sub-bands can be the same, or respective optimal modulation orders can be set according to an equalization rule, so that the bit error rate performance is optimal. Furthermore, the modulation order can also be adjusted to suppress the peak-to-average ratio. The requirements of the system on the peak-to-average ratio can be combined, the equalization rule adopted by a receiver is also considered, and the appropriate modulation order is selected.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for continuous stream transmission of mixed carriers without cyclic prefix filtering based on fast convolution. Background technique [0002] In modern communication systems, Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used due to its high spectral efficiency and strong resistance to multipath fading. But it has high side lobe power, so it has strict requirements on the synchronization of transmission. In order to suppress the out-of-band power and reduce the synchronization requirements of the system, scholars have proposed a variety of technologies, such as filter bank multi-carrier (FBMC), filtered OFDM (Filtered-OFDM), generalized frequency division multiplexing (Generalized frequency division multiplexing, GFDM) and Universal filtered multi-carrier (UFMC) (Vakilian, V.; Wild, T.; Schaich, F.; ten Brink, S. & Frigon, J.F. Universal-fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456H04L27/26
CPCH04B7/0456H04L27/2601H04L27/2614
Inventor 梅林林旭沙学军
Owner HARBIN INST OF TECH
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