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Channel estimation method of micro-power wireless communication system based on OFDM modulation

A micro-power wireless and communication system technology, applied in baseband system components and other directions, can solve problems such as frequency fading, and achieve the effect of eliminating floor effect, filtering channel noise, avoiding energy leakage and channel mismatch.

Active Publication Date: 2015-07-22
WUXI JINGXIN MICRO ELECTRONICS CO LTD
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Problems solved by technology

Usually, due to the emission and scattering of walls, buildings, or the ground, the transmitted signal usually reaches the receiving antenna through multiple paths with different delays and varying amplitudes, thus forming a multipath phenomenon and causing frequency selective fading

Method used

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  • Channel estimation method of micro-power wireless communication system based on OFDM modulation
  • Channel estimation method of micro-power wireless communication system based on OFDM modulation
  • Channel estimation method of micro-power wireless communication system based on OFDM modulation

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the drawings and preferred embodiments.

[0022] The specific embodiment of the present invention provides a channel estimation method of a micro-power wireless communication system based on OFDM modulation, which is used to perform frequency domain channel estimation at the receiving end of the system. The method includes the following steps 10-50, and can refer to figure 1 :

[0023] 10. Perform channel estimation on effective pilot sub-carriers to obtain frequency domain channel estimates of effective pilot sub-carriers This step can use conventional channel estimation methods, such as least square method or least mean square error method;

[0024] 20. Frequency domain channel estimation value based on the Fourier transform function, time domain channel impulse response length, position transformation matrix and effective pilot subcarrier Constructing frequency domain channel estimation value of virt...

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Abstract

The invention discloses a channel estimation method of a micro-power wireless communication system based on OFDM modulation, comprising the steps as follows: A, getting frequency domain channel estimated value of a valid pilot frequency subcarrier; B, establishing frequency domain channel estimated value of a virtual pilot frequency subcarrier and first frequency domain channel estimated value of a full spectrum band pilot frequency subcarrier; C, calculating first time domain channel impulse response estimated value corresponding to the first frequency domain channel estimated value; D, evaluating length of a time domain channel impulse response based on noise threshold dynamic evaluation algorithm of the time domain channel impulse response and filtering a channel noise to obtain second time domain channel impulse response estimated value; E, performing FFT conversion for the second time domain channel impulse response estimated value to obtain second frequency domain channel estimated value of the full spectrum band pilot frequency subcarrier. The method provided by the invention solves the problem of channel energy leakage and channel distortion brought by introducing a virtual subcarrier and improves the accuracy of channel estimation by combining with a self-adaption channel noise filtering method.

Description

Technical field [0001] The present invention relates to the field of micro-power wireless communication, and in particular to a channel estimation method of a micro-power wireless communication system based on OFDM modulation. Background technique [0002] In a general sense, as long as the two communicating parties transmit information through radio waves, and the transmission power is limited to a small range (usually below 100mw), it can be called micro-power wireless communication. [0003] With the rapid development of smart grids in my country, micro-power wireless communication technology is also applied to the collection of electricity consumption information. At present, the modulation and demodulation technology of the mainstream micro-power wireless transceiver chip is mainly based on (G)FSK. This type of technology has defects such as relatively wide occupied frequency band, low frequency band utilization, and insufficient sensitivity. Aiming at the construction goal o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 不公告发明人
Owner WUXI JINGXIN MICRO ELECTRONICS CO LTD
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