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Signal sending method and device

A signal transmission and symbol technology, applied in the field of data processing, can solve the problems of not reflecting channel time-varying, low accuracy, low data accuracy, etc.

Active Publication Date: 2016-07-06
HUAWEI TECH CO LTD
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  • Claims
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Problems solved by technology

Since the power line communication channel is time-varying, when the frame length is long (for example, greater than 10 milliseconds), the result of channel estimation at the receiving end only based on the preamble cannot reflect the time-varying nature of the channel, which will lead to channel estimation at the receiving end The accuracy of the data is low, which leads to the low accuracy of the data decoded by the receiving end

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Embodiment Construction

[0025] The technical solutions of the embodiments of the present invention are applied to a system that includes a preamble in a physical layer frame structure, where the physical layer frame structure may include, but is not limited to: the physical layer frame structure specified in the broadband P1901 standard, and the physical layer specified in the narrowband G3 standard. Layer frame structure, physical layer frame structure specified in the narrowband PRIME standard, etc.

[0026] The physical layer frame structure specified in the broadband P1901 standard and the physical layer frame structure specified in the narrowband G3 standard, such as figure 1 Shown. among them, figure 1 The frame structure shown is composed of three parts, namely: preamble, frame control (full English name: framecontrol, English abbreviation: FC) field, and payload data (full English name: payload, English abbreviation: PL) field. The FC field is composed of OFDM symbols that carry control informat...

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Abstract

The present invention discloses a signal sending method and device for increasing the accuracy degree of channel estimation of a receiving end, thereby increasing the accuracy degree of data decoding of the receiving end. The method is applied to a system in which a physical layer frame structure includes a preamble and a payload PL field, and the method includes: inserting, among OFDM time domain symbols in the PL field, one or more pilot-frequency time-domain symbols to obtain a physical layer frame; and sending, to the receiving end, the physical layer frame; wherein the preamble and the pilot-frequency time-domain symbols are used together to enable the receiving end to conduct channel estimation.

Description

Technical field [0001] The present invention relates to the field of data processing technology, and in particular to a signal transmission method and device. Background technique [0002] In power line communication, for systems that include a preamble (English: preamble) in the physical layer frame structure, the receiving end generally uses the preamble for frame synchronization, channel estimation, and so on. The preamble is composed of several orthogonal frequency division multiplexing (full English name: orthogonal frequency division multiplexing, English abbreviation: OFDM) symbols known by the receiving end. [0003] In order to transmit a large amount of information, in power line communication, the frame length of the physical layer frame is set to be relatively long. Because the power line communication channel is time-varying, when the frame length is long (for example, greater than 10 milliseconds), the receiver only performs channel estimation results based on the pr...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L25/02
CPCH04L5/0048H04L25/023H04L5/0007H04L5/0044H04L5/0053H04L25/0202H04B3/542H04L5/005H04L25/0204
Inventor 胡宇鹏
Owner HUAWEI TECH CO LTD
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