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Judgment feedback channel estimation method based on training sequence in light OFDM (orthogonal frequency division multiplexing) system

A training sequence and channel estimation technology, which is applied in the field of optical fiber communication systems, can solve problems such as optical fiber channel fluctuations and inability to track channel dynamic changes well, and achieve the effects of improving accuracy, improving effective rate and spectrum efficiency, and improving system performance

Inactive Publication Date: 2010-08-11
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0012] 3) The current optical network is more and more intelligent, and the dynamic configuration of the network will cause fluctuations in the fiber channel
Existing channel estimation methods cannot track channel dynamics well

Method used

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  • Judgment feedback channel estimation method based on training sequence in light OFDM (orthogonal frequency division multiplexing) system
  • Judgment feedback channel estimation method based on training sequence in light OFDM (orthogonal frequency division multiplexing) system
  • Judgment feedback channel estimation method based on training sequence in light OFDM (orthogonal frequency division multiplexing) system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072]The notable feature of Embodiment 1 is that it has a channel information storage module 303. The updated channel information at 307 is stored in 303, which is used to compensate the next incoming OFDM data block. Within a period of time, under the premise of maintaining a certain system performance, the first embodiment only needs to send the training sequence once, and use the determined data to continuously update the channel estimation information to track channel changes. The updated channel information is stored in 303, and each time an OFDM data block arrives, it is processed once in Embodiment 1, and the cycle continues within a certain period of time. The notable advantage of the first embodiment is that the frequency of sending the training sequence is reduced, the effective rate of the system is improved, and the change of the channel can be tracked.

[0073] see Figure 4 , Figure 4 It is a schematic flow diagram of the system in Embodiment 1 of the present...

Embodiment 2

[0094] Compared with Embodiment 1, the significant difference between Embodiment 2 and Embodiment 1 is that the transmission frequency of the training sequence is different, and Embodiment 2 does not need to store the channel estimation information of the last received OFDM data block. In the second embodiment, the transmission frequency of the training sequence is faster than that of the first embodiment, and the performance is also higher than that of the first embodiment, and the accuracy and speed of tracking channel changes are better than those of the first embodiment. Compared with the first embodiment, the second embodiment requires more training sequences, and the system cost is high. training sequence extraction channel information module 802, channel estimation module 805 and channel information feedback module 806 based on decided data, and image 3 302, 306 and 307 in the same.

[0095] In the second embodiment, compared with the channel estimation method simply ...

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Abstract

The invention discloses a judgment feedback channel estimation method based on a training sequence in a light OFDM (orthogonal frequency division multiplexing) system. The judgment feedback channel estimation method based on the training sequence reduces the training frequency transmitting efficiency needed by the channel estimation of the light OFDM system, improves the effective rate and frequency spectrum efficiency of the system and can reduce the influence of factors, such as noise, laser line width, and the like, trace the change condition of a channel and improve the precision and system performance of the channel estimation. Meanwhile, the judgment feedback channel estimation method based on the training sequence can be suitable for a light transmission system adopting an OFDM technology and can be combined with other channel estimation technologies for use. The invention has the advantages of strong practicability, high precision of channel estimation, simple structure, low cost, low signal processing requirement, and the like.

Description

technical field [0001] The invention relates to a novel decision feedback channel estimation method based on a training sequence in an optical orthogonal frequency division multiplexing (OFDM) system, belonging to the category of an optical fiber communication system. Background technique [0002] With the rapid development of communication technology, historic changes have taken place in operators' business entities and profit models. People's demand for communication has moved from the initial voice service to digital service, and the demand for user network bandwidth is getting higher and higher. In the mobile field, a new wave of global 3G network construction has paved the way for the development of mobile video services. By 2015, wireless network traffic in developed regions will increase tenfold on the current basis. Whether it is fixed network or mobile network, network traffic has been growing at an accelerated rate. In the next 5 years, the bandwidth will increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04B10/12
Inventor 乔耀军王战胜纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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