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Soft information iterative receiving method based on bidirectional time domain equalization

A technology of time domain equalization and receiving method, which is applied in the shaping network, baseband system, channel estimation and other directions in the transmitter/receiver, which can solve the problems of elimination, ISI not obtained, and increase of bit error rate, etc.

Active Publication Date: 2019-01-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] In the FTN system, the most fundamental purpose is to improve the spectral efficiency, but if the channel estimation is inaccurate, the performance of the equalizer will inevitably decline, the ISI cannot be effectively eliminated, and the bit error rate will increase, and the bit error rate is the most important factor in the communication system. important performance indicators

Method used

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  • Soft information iterative receiving method based on bidirectional time domain equalization
  • Soft information iterative receiving method based on bidirectional time domain equalization
  • Soft information iterative receiving method based on bidirectional time domain equalization

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Embodiment

[0055] In order to facilitate the understanding of the subsequent receiving method, a brief description of the principle of the FTN communication system is given first. The transmission signal of the FTN system can be represented by the following formula:

[0056]

[0057] Among them, x[t] is the data symbol of modulation mapping at the tth moment; k represents the kth data symbol after modulation mapping; g(τ) is a prototype filter, and a raised cosine filter can be used, and the symbol period is T; E. s is the signal energy; λ (≤1) is the symbol period compression factor, and the double speed of the transmission rate improvement is 1 / λ, when λ=1, it is the traditional Nyquist transmission, therefore, the method of this embodiment is also applicable to the traditional Multipath time-varying Nyquist transmission.

[0058] When the transmitted signal passes through the wireless channel and the receiving end undergoes matched filtering, the receiving end signal can be expre...

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Abstract

The invention discloses a soft information iterative receiving method based on bidirectional time domain equalization, and the method is suitable for a super Nyquist (FTN) transmission system. Based on the forward and reverse channel estimation of a channel in a time domain, the method employs a weighted combining equalization method, and adopts a soft information iterative equalization (Turbo equalization) structure. Through the iterative exchange of soft information, the method makes the most of the error correction gain of the channel coding to effectively improve the error performance of the system. Meanwhile, the method employs an estimated mean value for transmitting a data symbol in the Turbo iteration for the channel estimation, so the method can better track channel changes. Compared with other methods, the method of the invention can more effectively eliminate the inter-symbol interference brought by the channel, can effectively resist the inter-symbol interference carried bythe FTN transmission system, and has lower computational complexity.

Description

technical field [0001] The invention relates to the field of digital wireless communication, in particular to a soft information iterative receiving method based on two-way time domain equalization which is suitable for a super-Nyquist transmission system and is suitable for time-varying multipath high ISI channels. Background technique [0002] With the rapid development of wireless communication services, especially the development of data services, multimedia services, Internet of Things, and Internet of Vehicles technologies, the demand for wireless transmission rates is increasing exponentially, and the shortage of radio spectrum resources has become increasingly prominent. Therefore, introducing new technologies in future mobile communications to improve spectrum efficiency has become a hotspot in the field of communications research, and the Faster Than Nyquist (FTN) transmission system can make the data transmission rate of the signal higher than the traditional Nyqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/0212H04L25/024H04L25/03012H04L25/03312H04L25/03821H04L2025/03611
Inventor 余华曹鼎季飞陈芳炯
Owner SOUTH CHINA UNIV OF TECH
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