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Joint time-frequency doubly selective channels (DSCs) estimation and faster-than-Nyquist signaling (FTNS) detection method

A dual channel selection and combined time-frequency technology, applied in baseband systems, shaping networks in transmitters/receivers, digital transmission systems, etc., can solve problems such as impaired transmission performance of communication systems

Inactive Publication Date: 2017-03-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problem that the transmission performance of the communication system is damaged because the joint channel estimation and symbol detection are not considered in the joint DSCs estimation and FTNS signal detection in the coding system, using variational Bayesian (Variational Bayesian, VB) method, which iteratively updates the approximate posterior probability density function of the channel coefficients and data symbols, and simultaneously eliminates the influence of intersymbol interference introduced by no CP and colored noise interference introduced by FTNS on the detection performance of FTNS, and proposes a joint time-frequency Dual-choice Channel Estimation and Super Nyquist Signal Detection Method

Method used

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  • Joint time-frequency doubly selective channels (DSCs) estimation and faster-than-Nyquist signaling (FTNS) detection method
  • Joint time-frequency doubly selective channels (DSCs) estimation and faster-than-Nyquist signaling (FTNS) detection method
  • Joint time-frequency doubly selective channels (DSCs) estimation and faster-than-Nyquist signaling (FTNS) detection method

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Embodiment 1

[0084] This embodiment illustrates the application of the present invention "a method for joint time-frequency dual-selection channel estimation and super-Nyquist signal detection" to a certain system. A certain system is a Low Density Parity Check Code (LDPC) coding system with a code length of 4896 and a code rate of 1 / 2. Shift Keying, QPSK) modulation, take τT as the symbol period, and transmit through the time-frequency dual-selection fading channel interfered with by additive Gaussian white noise, wherein the transmitting filter is a root-raised cosine filter with a roll-off factor α=0.5; The power delay spectrum of the dual-choice channel is Normalized Doppler rate α = 0.0023. In the simulation, the number of internal iterations is 3, the number of external iterations is 10, and the number of internal iterations of the decoder is 50.

[0085] figure 1 It is a flow chart of the method and the algorithm of this embodiment.

[0086] From figure 1 It can be seen that t...

Embodiment 2

[0106] This embodiment illustrates the simulation results of the method of the present invention under the system parameter conditions in Embodiment 1. figure 2 For the embodiment based on the bit error rate performance of the method proposed by the present invention; image 3 Embodiments are based on the channel estimation performance of the method described in the present invention.

[0107] figure 2 The middle abscissa is the bit signal-to-noise ratio E b / N 0 , where E b is the bit energy, N 0 is the noise power spectral density; the ordinate is the bit error rate. The dotted line in the figure represents the BER curve of the Nyquist signal, and the solid line represents the BER curve of the super-Nyquist signal; the four solid lines from left to right represent the compression factors of the super-Nyquist signal in order BER curves when τ=0.9, 0.8, 0.7, 0.6.

[0108] By observing figure 2 , it can be seen that when the compression factors of FTNS τ=0.8 and τ=0....

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Abstract

The invention discloses a joint time-frequency doubly selective channels (DSCs) estimation and faster-than-Nyquist signaling (FTNS) detection method, and belongs to the technical field of design of iterative receivers. The method has a core idea comprising the steps of dividing a transmission data block into a plurality of data sub-blocks, assuming that a channel coefficient in each data sub-block is invariable, using a first-order autoregression model to model channel variations between the different data sub-blocks, and performing channel estimation by fully using a time-varying channel statistical property with the aid of a forward-backward algorithm; constructing a reasonable frequency domain sub-system model to simultaneously cover interference between the data sub-blocks introduced without cyclic prefix (CP) and color noise interference introduced by the FTNS; and further acquiring an approximated posterior probability density function of the channel coefficients and data symbols by using a VB method based on the frequency domain sub-system model and iteratively updating parameter of the function. According to the method, the color noise interference and the interference between the data sub-blocks introduced without the CP are gradually eliminated during an iteration process, and the method has the advantages of low algorithm complexity, high system spectral efficiency, high reliable channel estimation and high symbol detection performance.

Description

technical field [0001] The invention relates to a joint time-frequency dual-selective channel (Doubly Selective Channels, DSCs) estimation and super Nyquist signal (Faster-than-Nyquist Signaling, FTNS) detection method, which belongs to the technical field of iterative receiver design in communication systems . Background technique [0002] Transcendent Nyquist (FTN) technology is a key technology to be adopted by the fifth generation (5G) cellular system to improve spectrum efficiency. By selecting a suitable time-domain waveform, FTN technology transmits symbols at a transmission rate exceeding the Nyquist rate while keeping the power spectral density constant, and obtains an improvement in spectral efficiency at the cost of introducing inter-symbol interference. . Aiming at the signal detection problem of FTNS through the additive white Gaussian noise (AWGN) channel, there have been a lot of researches from the perspective of time domain and frequency domain signal proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/03171H04L25/0222H04L2025/03611
Inventor 武楠施巧霖王华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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