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Synchronous symbol design method applicable to UFMC (Universal Filtered Multi-Carrier) waveform

A technology of synchronous symbols and design methods, applied in multiplex communication, time division multiplex system, electrical components, etc., can solve the problems of synchronization process interference, precision drop, etc.

Active Publication Date: 2017-05-03
白盒子(上海)微电子科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, because UFMC uses a filter at the sending end, the signal generated by the traditional synchronization symbol generation method no longer maintains an equal structure, resulting in greater interference during the synchronization process and a decrease in accuracy.

Method used

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  • Synchronous symbol design method applicable to UFMC (Universal Filtered Multi-Carrier) waveform
  • Synchronous symbol design method applicable to UFMC (Universal Filtered Multi-Carrier) waveform
  • Synchronous symbol design method applicable to UFMC (Universal Filtered Multi-Carrier) waveform

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Embodiment Construction

[0023] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0024] Firstly, the traditional synchronous symbol generation method is introduced.

[0025] Suppose a Universal Filtered Multi-Carrier (UFMC) system contains N subcarriers, and the coefficient of the filter is f=[f(0),f(1),...,f(L-1)], where L represents the filter length. After the inverse Fourier transform (IDFT) of N points, the time domain signal s=[s(0),s(1),…,s(N-1)] is obtained T for:

[0026] s = DS (1)

[0027] In formula (1), D is an N×N-dimensional energy-normalized IDFT matrix, and the elements of its i-th row and n-th column are S=[S(0),S(1),...,S(N-1)] T Represents the modulation symbol in the frequency domain. Define a (N+L-1)×N-dimensional complex Toeplitz matrix F, whose first column is The first line is [f(0),0 1×(N-1) ] T , then the sending signal of UFMC can be expressed as:

[0028] x=Fs=FDS (2)

[0029] In an OF...

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Abstract

The invention discloses a synchronous symbol design method applicable to a UFMC (Universal Filtered Multi-Carrier) waveform. The method comprises the following steps: S1, generating a time domain sequence A having the length (N-L) / 2, and then adding L zeros behind to form a B sequence having the length (N+L) / 2; S2, duplicating the B sequence, then putting the duplicated sequence behind the B sequence to form front and back halves of equal synchronous symbols, and sending the synchronous symbols via a filter; S3, a receiving end converting received signals down to a baseband, and storing the signals; S4, taking the i sampling point of the received signals as a starting point, sampling (N+L) / 2 sampling points behind, and saving the sampling points as a row vector V1; S5, taking the (i+(N+L) / 2) sampling point of the received signals as a starting point, sampling (N+L) / 2 sampling points behind, and saving the sampling points as a row vector V2; S6, calculating the result of V1V2<H>, and obtaining module values rhoi; and S7, comparing the value of each rhoi in an observation window, and selecting the sampling position corresponding to the maximum as the starting position of the UFMC symbols. The synchronous symbol design method can be applied to a UFMC waveform technology which may be adopted in next generation communication system, and does not need to change the existing communication system and standard.

Description

technical field [0001] The invention relates to the technical field of synchronization in mobile communication systems, in particular to a method for designing synchronization symbols suitable for UFMC waveforms. Background technique [0002] In mobile communication systems, waveform has always been one of the main components in air interface technology. The fourth-generation mobile communication system (4G) currently in commercial use adopts Orthogonal Frequency Division Multiple Access (OFDM) technology as its air transmission waveform. OFDM technology has the advantages of high transmission efficiency, simple implementation, and easy combination with multiple-input multiple-output (MIMO). However, since OFDM adopts rectangular window truncation in the time domain processing, there is a high out-of-band leakage, which is not conducive to supporting asynchronous transmission of adjacent sub-bands. Universal filter multi-carrier (UFMC) technology inherits the advantages of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0605
Inventor 盛彬刘恒张辉吴琼刘媛美
Owner 白盒子(上海)微电子科技有限公司
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