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High-spectral-efficiency pilot design and channel estimation method in FBMC system

A technology for channel estimation and pilot design, applied in the field of pilot design and channel estimation with high spectral efficiency, which can solve the problems of unsatisfactory results, inaccurate channel estimation, and large pilot overhead.

Active Publication Date: 2017-05-31
XI AN JIAOTONG UNIV
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Problems solved by technology

However, since half of the conventional pilots are set to zero, that is, the channel frequency response on this part of the subcarrier needs to be obtained by interpolation, resulting in channel estimation that is not so accurate, and the result is obviously unsatisfactory
The problem of excessive pilot overhead in FBMC is an urgent problem to be solved

Method used

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  • High-spectral-efficiency pilot design and channel estimation method in FBMC system
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Embodiment Construction

[0064] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0065] The present invention is a channel estimation technology of a filter bank multi-carrier (FBMC) system in the field of wireless communication. Data symbols to be sent are placed on both sides of the pilot at the sending end, and channel estimation is performed at the receiving end in an iterative manner. The overall algorithm of the system Process such as figure 1 shown.

[0066] 1. Sending end

[0067] (1) Perform QPSK constellation point modulation on the information bit stream to obtain complex data symbols, and perform serial-to-parallel conversion.

[0068] (2) Perform OQAM preprocessing on the complex data symbols, that is, only take the real part and the imaginary part of the complex data symbols, and convert them into real data symbols. According to the number of subcarriers M of the FBMC system, the system bandwidth ...

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Abstract

The invention discloses a high-spectral-efficiency pilot design and channel estimation method in an FBMC system. According to the method, at a transmitting end of the FBMC system, a column of data power on a frequency time coordinate is halved when a pilot is inserted into a head of each data block, data is symmetrically placed at two sides of the pilots, and the pilots are still repeated continuously according to a rule of [1, -j, -1, j ]<T>; at a system receiving end, the channel estimation accuracy is effectively improved through an iteration method, it is assembled that data protection columns are placed at two sides of the pilots, pseudo-pilots are calculated for channel estimation, the data placed at two sides of the pilots are demodulated; and the pseudo-pilots are calculated again for channel estimation through utilization of the demodulated data at two sides of the pilots, and all data is demodulated. According to the method, the pilot cost is effectively reduced in the FBMC system, and the spectral efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the field of wireless communication, in particular to a pilot frequency design and channel estimation method with high spectral efficiency in an FBMC system. 【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 carrier modulation systems. Filter bank multicarrier (FBMC) technology can effectively reduce the out-of-band leakage of signals by using prototype filters with good time-frequency focusing characteristics. In addition, FBMC technology introduces operations such as polyphase filter and fast Fourier transform, which greatly reduces its own complexity and calculation amount, and has broad application p...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L25/02
CPCH04L5/0048H04L25/0202
Inventor 王慧明郑修鹏
Owner XI AN JIAOTONG UNIV
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