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A Pilot Design Method Based on Iterative Average Processing

A technology of averaging processing and pilot frequency design, applied in the field of communication, can solve the problems affecting the performance of receiver channel estimation, PAPR increase of frequency domain signals, uneven signal power distribution, etc., and achieve good channel estimation performance and low PAPR. , the effect of increasing the complexity of the system

Inactive Publication Date: 2017-08-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0010] According to the symmetry principle of Fourier transform, CI-OFDM realizes the reduction of PAPR of time domain signal through CI expansion, which inevitably leads to the increase of PAPR of frequency domain signal, which is manifested as uneven distribution of signal power at each frequency point. The signal energy of some frequency points will be particularly low, and this phenomenon will also occur after the pilot is extended by CI. The low pilot energy of individual subcarriers will obviously affect the channel estimation performance of this frequency point. Obviously, the frequency domain and time domain The equalization of signal power allocation constitutes a contradiction. How to minimize the occurrence of low pilot signal power at individual frequency points on the premise of ensuring that the time-domain signal PAPR of block pilots is low has become a difficulty, which also directly affects to the performance of receiver channel estimation

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  • A Pilot Design Method Based on Iterative Average Processing
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Embodiment Construction

[0031] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0032] In this embodiment, the Matlab2013a simulation platform is used for running experiments. The simulation system adopts the NCI-OFDM system introduced in Document 3. System parameters: subcarrier N=512, cyclic prefix N g =64, sampling time T s =0.1us, the modulation method is QPSK modulation.

[0033] The subcarriers occupied by the primary user account for 20% of the total number of subcarriers, that is, the number of subcarriers occupied by the primary user is N zero =N×20% pieces.

[0034] The pilot frequency adopts block pilot frequency, and one frame of the transmitted signal includes 1 pilot frequency signal and 9 data signals.

[0035] The simulated channel uses the "COST207 TUx6" Typical Urban (TU) channel model, which uses the classic Jakes power spectrum and two custom power spectra of Gauss I type and...

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Abstract

The invention belongs to the technical field of communication, and in particular relates to a pilot design method based on iterative average processing when subcarriers are not continuously available. In the case of non-continuous availability of sub-carriers, based on the idea of ​​iterative average processing, a pilot symbol suitable for carrier spread OFDM system is designed. Using this pilot symbol can effectively overcome the high peak-to-average power ratio of OFDM system problem, and can guarantee excellent bit error performance.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a pilot design method based on iterative average processing when subcarriers are not continuously available. Background technique [0002] Cognitive radio technology was first proposed by Dr. Joseph Mitola III in 1999. Its core idea is to obtain the spectrum available at the current time through spectrum sensing, and use these spectrums for data transmission, thus greatly improving the utilization of spectrum as a whole. Rate. [0003] Based on the idea of ​​cognitive radio, when applied to an Orthogonal Frequency Division Multiplexing (OFDM) system, some subcarriers will be occupied by primary users, and the frequency spectrum is no longer continuously available. According to this feature, non-continuous OFDM (Non-Contiguous Orthogonal Frequency Division Multiplexing, NC-OFDM) transmits data through unoccupied subchannels, and zeros the subcarriers correspondi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 王军赵阳陈亚丁李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA