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Data transmission method of filter bank multi-carrier-wave system

A data transmission method and technology of multi-carrier system, applied in transmission systems, digital transmission systems, multiple use of transmission paths, etc., can solve the problem of high extra energy and achieve the effect of energy reduction

Active Publication Date: 2015-01-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a data transmission method for a filter bank multi-carrier system, the purpose of which is to solve the problem that the auxiliary pilot symbols existing in the FBMC system are used to offset the virtual effects of the pilot symbols. The technical problem that the extra energy of external interference is too high

Method used

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  • Data transmission method of filter bank multi-carrier-wave system
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example 1

[0035] This particular embodiment is a FBMC system with 256 subcarriers, selects the modulation of QPSK, and each carrier sends 20 symbols, and the filter used is a Phydas filter with a length of 1024, for 4 around the pilot symbol Auxiliary pilot symbols are designed, and the position of S is as attached figure 1 As shown, and S needs to cancel the imaginary part interference of the data in the surrounding 3×9 area on the pilot symbols.

[0036] (1) Obtain the interference coefficient A=[a of the auxiliary pilot symbols around the pilot symbols to the pilot symbols 1 ,a 2 ,a 3 ,a 4 ]=[0.2393,-0.5644,0.5644,-0.2393], the data D around the pilot symbol=[d1 , d 2 , d 3 ,... d 22 ] T (1 pilot symbol and 4 auxiliary pilot symbols are removed in the 3 × 9 area, and there are 22 data in total), the data around the pilot symbol interfere with the pilot symbol B=[b 1 ,b 2 ,...,b 22 ]=[0.0054,0.0429,0.1250,0.2058,0.2058,0.1250,0.0429,0,-0.0668,0,0,0.0668,0,-0.0054,0.0429,-0.1...

example 2

[0056] This particular embodiment is a FBMC system with 256 subcarriers, selects the modulation of QPSK, and each carrier sends 20 symbols. The filter used is a Phydas filter, and the 8 auxiliary pilot symbols around the pilot symbol are processed. design, the position of S is as attached figure 2 As shown, and S needs to cancel the imaginary part interference of the data in the surrounding 3×9 area on the pilot symbols.

[0057] (1) Obtain the interference coefficient A=[a of the auxiliary pilot symbols around the pilot symbols to the pilot symbols 1 ,...,a 8 ]=[0.2058,0.2393,0.2058,-0.5644,0.5644,0.2058,-0.2393,0.2058], the data D around the pilot symbol=[d 1 , d 2 , d 3 ,... d 18 ] T (1 pilot symbol and 8 auxiliary pilot symbols are removed in the 3 × 9 area, there are 18 data in total), the data around the pilot symbol interfere with the pilot symbol B=[b 1 ,b 2 ,...,b 18 ]=[0.0054,0.0429,0.1250,0.1250,0.0429,0.0054,0,-0.0668,0,0,0.0668,0,-0.0054,0.0429,-0.1250,-...

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Abstract

The invention discloses a data transmission method of a filter bank multi-carrier-wave system, and belongs to the field of filter bank multi-carrier-wave communications. A plurality of auxiliary pilot symbols adjacent to pilot frequency are used for offsetting imaginary part interference borne by the pilot frequency, and extra data can be transmitted through encoding. Thus, the technical problem that in the filter bank multi-carrier-wave system, pilot symbols will be subject to imaginary part interference is solved. The method comprises the steps of calculating the imaginary part interference borne by the pilot frequency, calculating an encoding matrix, designing the auxiliary pilot frequency symbols around the pilot frequency, transmitting and receiving the data, estimating and balancing a channel and recovering the data. The data transmission method can obviously reduce the energy for offsetting the imaginary part interference on the condition that good channel estimation performance is guaranteed.

Description

technical field [0001] The invention belongs to the field of multi-carrier communication, and more specifically relates to a data transmission method of a filter bank multi-carrier system. Background technique [0002] In recent years, the research on Filter Bank Multi Carrier-Offset Quadrature Amplitude Modulation (FBMC-OQAM for short) technology has attracted great attention. Compared with the Orthogonal Frequency Division Multiplexing (OFDM for short) technology, the FBMC-OQAM technology has a higher spectrum utilization rate. However, the imaginary part interference in FBMC-OQAM is a huge challenge to the pilot scheme design. [0003] Present article by J-P. Javaudin (J-P. Javaudin, D. Lacroix, and A. Rouxel, "Pilot-aided channel estimation for OFDM / OQAM", in VTC'03 Spring, vol.3, pp.1581-1585, April 2003 ) proposed a pilot design scheme of a single auxiliary pilot, which mainly uses a single auxiliary pilot symbol to offset the imaginary part interference of the pilot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048
Inventor 屈代明崔文佳江涛
Owner HUAZHONG UNIV OF SCI & TECH
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