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Ofdm system signal sending and receiving method

A receiving method and system signal technology, which is applied in the field of OFDM system signal transmission and reception, can solve problems such as limited receiver detection performance, and achieve the effect of improving detection performance

Active Publication Date: 2019-09-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The traditional OFDM system needs to send pilot symbols (Pilot Symbols) through the transmitting end to enable the receiving end to perform channel estimation, and then perform coherent detection (Coherent Detection) on each subcarrier of the received signal to recover the transmitted symbols, so the traditional method exists Problems with limited receiver detection performance

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  • Ofdm system signal sending and receiving method

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Embodiment Construction

[0034] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] The traditional OFDM system needs to send pilot symbols through the sending end to make the receiving end estimate the channel information, and then perform coherent detection on the received signal to recover the sent signal. The present invention is different from the traditional OFDM signal detection scheme, and proposes a novel OFDM system sending and receiving signal method, which directly clusters the received signals in the frequency domain, and indicates the category of the clustered symbols through the identifier sent by the sending end, thereby Reverts out sending symbols.

[0036] After the receiving end performs the process of removing the cyclic prefix and fast discrete Fourier transform (FFT), the signal at this time can be expressed as

[0037] y=Λs+u,

[0038] Wherein, s refers to an OFDM symbol, s=[s 0 ,s 1 ,...,...

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Abstract

The invention belongs to the technical field of communication, and specifically relates to an OFDM system signal sending and receiving method. The main method of the invention comprises the following steps: on a sending end: performing identifier adding, IFFT and cyclic prefix insertion on a sending symbol in sequence, and then outputting an OFDM signal; and on a receiving end: performing cyclic prefix removal and FFT on the received OFDM signal, clustering subcarrier frequency domain signals, and distinguishing the category of the clustered symbol according to the identifier, and restoring the sending symbol. The OFDM system signal sending and receiving method provided by the invention has the beneficial effects that, compared with the traditional technology, the detection performance of a receiver can be greatly improved by the method provided by the invention, and no channel estimation needs to be carried out on the receiving end.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an OFDM system signal sending and receiving method. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) systems have been widely used in wireless communications (such as WiFi and LTE, etc.) and wired communications systems (such as ADSL). The traditional OFDM system needs to send pilot symbols (Pilot Symbols) through the transmitting end to enable the receiving end to perform channel estimation, and then perform coherent detection (Coherent Detection) on each subcarrier of the received signal to recover the transmitted symbols, so the traditional method exists Problems with limited receiver detection performance. Contents of the invention [0003] The object of the present invention is to solve the above problems and propose a method for sending and receiving OFDM system signals that does not require channel estimation at the recei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L5/00
Inventor 梁应敞张倩倩黄雨迪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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