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Pilot design and synchronous channel estimation method for FBMC/OQAM (Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation)

A technology for synchronous channel and pilot frequency design, applied in channel estimation, multi-frequency code system, modulated carrier system, etc., can solve the problem of estimation performance and spectral efficiency need to be improved

Active Publication Date: 2017-12-05
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the estimation performance and spectral efficiency when simultaneously estimating time offset, frequency offset and channel parameters still need to be improved

Method used

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  • Pilot design and synchronous channel estimation method for FBMC/OQAM (Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation)
  • Pilot design and synchronous channel estimation method for FBMC/OQAM (Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation)
  • Pilot design and synchronous channel estimation method for FBMC/OQAM (Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation)

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Embodiment Construction

[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0066] A time-frequency synchronization and channel estimation method flow in an FBMC / OQAM system is as follows figure 2 shown.

[0067] 1. Transmitter

[0068] (1) Perform QPSK modulation and serial-to-parallel conversion on the information bit stream at the transmitter, and then perform OQAM preprocessing to convert complex data symbols into real data symbols.

[0069] (2) Insert the head of the data symbol block at the sending end as figure 1 pilot shown. On the frequency and time coordinates, each column corresponds to M parallel subcarriers at a time, and the requirements for pilot insertion are as follows: the pilot is placed in the second and fourth columns of the data block, and each column is in accordance with [1,j,-1 ,-j] T The law of constantly repeating; the first, third, and fifth columns are the same real number data columns to be sent wh...

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Abstract

The invention discloses a pilot design and synchronous channel estimation method for FBMC / OQAM (Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation). Pilots are inserted at the transmitting end of the FBMC / OQAM system; at a system receiving end, the reversal symmetry of a data column adjacent to a pilot column is used to carry out moving correlation on received signals to determine a starting position; the corresponding relationship between the pilots on the same subcarrier is used in a frequency domain to obtain a frequency offset estimation value, and interference on estimation by the data column adjacent to the pilot column and channel noise is reduced through iteration; after frequency offset compensation, the data column adjacent to the pilot column is firstly assumed to be a zero protected column, pseudo pilots are thus calculated, channel estimation in the frequency domain is then carried out, and data symbols adjacent to the pilot column are then demodulated; and finally, the demodulated data symbols adjacent to the pilot column are used to calculate the pseudo pilots again to estimate the channel. The time offset, the frequency offset and the channel are estimated jointly in the FBMC / OQAM system, and the spectral efficiency is improved, and the estimation performance is also enhanced significantly.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a FBMC / OQAM pilot design and synchronization channel estimation method. Background technique [0002] Because the multi-carrier modulation system can not only provide high-speed data transmission, double the system capacity, but also effectively resist the frequency selective fading of the channel, it has received extensive attention and research from academia and industry. However, high out-of-band leakage has always been a major drawback of multi-carrier modulation systems. Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation (FBMC / OQAM, Filter Bank Multicarrier with Offset Quadrature AmplitudeModulation) system can effectively reduce the out-of-band leakage of signals by using a prototype filter with good time-frequency focusing characteristics. In addition, the FBMC / OQAM (OFDM / OQAM) system greatly reduces its own complexity and calculation load through o...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/00H04L27/26H04L27/34H04B17/391
CPCH04B17/391H04L25/0228H04L25/024H04L27/0014H04L27/2602H04L27/264H04L27/2655H04L27/2669H04L27/2675H04L27/2698H04L27/34H04L2027/0026
Inventor 王慧明史珂郑修鹏
Owner XI AN JIAOTONG UNIV
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