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Data transmission method

A data transmission method and data symbol technology, applied in the field of data transmission, can solve the problems of high peak-to-average power ratio, complex implementation, and inability to significantly reduce PAPR.

Active Publication Date: 2018-08-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, as a kind of multi-carrier modulation, the transmission signal in the FBMC system is also generated by the superposition of various carrier components, so it is difficult to avoid the problem of excessive peak-to-average power ratio (PAPR)
Among the existing methods for reducing PAPR, the DFT-s-FBMC technology is simple to implement and there is no problem of processing delay, but because each symbol segment is processed independently during the operation, new peaks will be generated when the symbol segments are added signal, so the PAPR cannot be significantly reduced. Although the FB-s-FBMC technology can significantly reduce the PAPR, the implementation is complicated and the processing delay problem is serious

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Embodiment 1

[0163] The specific conditions of this embodiment are that the total number M of subcarriers is 1024, and the number M of data symbols sent within time T is s is 256, the symbol sequence a to be sent k The length is 10368, where {a 1 ,a 2 ,...,a 128}, {a 10239 ,a 10240 ,...,a 10368} is 0 to act as a signal transition, {a 129 ,a 130 ,...,a 10238} is a complex symbol, and the overlapping factor of the filter used is K=4. Under this specific condition, the implementation steps can be expressed as:

[0164] (1) Divide the data symbol sequence to be sent into 80 data symbol segments with a length of 256 {x 0 ,x 1 ,...,x 80}, where the kth element of the nth data symbol segment is denoted as x n [k]:

[0165]

[0166] x n [k]=a 128(n-1)+k ,0≤k≤255,(n≠0)

[0167] (2) Use w to represent a window vector with a length of 256, for the nth data symbol segment x n After windowing, we get:

[0168] r n = Diag(w) x n

[0169] Among them, the role of the Diag function...

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Abstract

The invention discloses a data transmission method, and the method comprises the following steps: numbering to-be-sent data symbols according to symbol segments, and processing a to-be-sent data symbol segment according to a serial number thereof, mapping the processed data symbols on a carrier; and after processing the to-be-sent data symbol segment according to the serial number thereof and consequently mapping the data symbol segment on the carrier, for the data symbol segment with an even serial number, transmitting a real number part by an even serial number subcarrier, transmitting an imaginary number part by an odd serial number subcarrier, and for the data symbol segment with an odd serial number, transmitting the imaginary number part by the even serial number subcarrier, and transmitting the real number part by the odd serial number subcarrier, thereby realizing sending data by cooperation between neighboring data symbol segments. In the method, preprocessing for a data symbol sequence is added, and thus, peak-to-average power ratio of sending signals can be reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a data transmission method. Background technique [0002] As a key technology of future wireless communication, filter bank multi-carrier system (FBMC) is a hot spot in the research of communication system. Compared with Orthogonal Frequency Division Multiplexing (OFDM), FBMC uses a prototype filter instead of a rectangular window. Unlike the sudden change of the signal when using a rectangular window, the signal passing through the prototype filter has a roll-off process and changes gently. Therefore The signal will have better spectral characteristics when using FBMC technology. However, as a kind of multi-carrier modulation, the transmitted signal in the FBMC system is also generated by the superposition of various carrier components, so it is difficult to avoid the problem of too high peak-to-average power ratio (PAPR). Among the existing met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614H04L27/2627
Inventor 屈代明刘泽江涛
Owner HUAZHONG UNIV OF SCI & TECH