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Channel Estimation Method for Micropower Wireless Communication System Based on Ofdm Modulation

A micro-power wireless and communication system technology, applied in the direction of baseband system components, etc., can solve frequency fading and other problems, achieve the effect of eliminating floor effect, improving accuracy, avoiding energy leakage and channel mismatch

Active Publication Date: 2017-09-22
WUXI JINGXIN MICRO ELECTRONICS CO LTD
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  • Application Information

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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

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  • Channel Estimation Method for Micropower Wireless Communication System Based on Ofdm Modulation
  • Channel Estimation Method for Micropower Wireless Communication System Based on Ofdm Modulation
  • Channel Estimation Method for Micropower Wireless Communication System Based on Ofdm Modulation

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Embodiment Construction

[0021] The present invention will be further described below with reference to the accompanying drawings and in combination with 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 the effective pilot subcarriers to obtain frequency domain channel estimates for the effective pilot subcarriers This step can use a conventional channel estimation method, such as a least square method or a minimum mean square error method;

[0024] 20. Based on the Fourier transform function, the length of the time domain channel impulse response, the position transformation matrix and the frequency domain channel estimation value of the effective ...

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Abstract

The invention discloses a channel estimation method for a micro-power wireless communication system based on OFDM modulation. and the first frequency-domain channel estimation value of the full-band pilot subcarrier; C. Calculate the first time-domain channel impulse response estimation value corresponding to the first frequency-domain channel estimation value; D. Based on the time-domain channel impulse The response noise threshold dynamic evaluation algorithm, evaluates the length of the time-domain channel impulse response, and filters out the channel noise to obtain a second time-domain channel impulse response estimated value; E: Estimate the second time-domain channel impulse response The value of the value of the value is made to obtain the second -frequency domain channel estimation value of the full -frequency band contestant. The method provided by the invention avoids the problems of channel energy leakage and channel distortion caused by the introduction of virtual sub-carriers, and improves the accuracy of channel estimation combined with the adaptive channel noise filtering method.

Description

technical field [0001] The invention relates to the field of micro-power wireless communication, in particular to a channel estimation method of a micro-power wireless communication system based on OFDM modulation. Background technique [0002] Generally speaking, as long as the communication 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 my country's smart grid, micro-power wireless communication technology is also applied to the collection of electricity consumption information. At present, the modulation and demodulation technology of mainstream micro-power wireless transceiver chips is mainly based on (G)FSK, which has defects such as relatively wide frequency band occupation, low frequency band utilization, and insufficient sensitivity. Aiming at the construction goal of "full acquisition and full p...

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Application Information

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