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Residual carrier deviation and sampling deviation estimation method and compensation method

A technology of sampling deviation and carrier, applied in the field of micro-power wireless communication, can solve the problem of destroying the orthogonality of sub-carriers, and achieve the effect of assisting reliable reception and accurate estimation

Inactive Publication Date: 2014-12-31
深圳市力合微电子股份有限公司
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Problems solved by technology

In addition, on the one hand, sampling deviation will generate time-varying timing deviation, resulting in time-varying phase change, and on the other hand, it will also destroy the orthogonality between subcarriers, resulting in ICI

Method used

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  • Residual carrier deviation and sampling deviation estimation method and compensation method
  • Residual carrier deviation and sampling deviation estimation method and compensation method
  • Residual carrier deviation and sampling deviation estimation method and compensation method

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Embodiment Construction

[0044] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.

[0045] Such as figure 1 Shown is a flow chart of a method for estimating residual carrier deviation and sampling deviation of a micropower wireless communication system based on OFDM modulation in a preferred embodiment of the present invention. The system parameters used in this implementation case are defined in the following table:

[0046] Table 1 OFDM micropower wireless communication system parameters

[0047] indicators

value

bandwidth

187.5KHz

Number of OFDM subcarriers N

128

Effective number of subcarriers N V

96

[0048] Subcarrier spacing Δf

1.953125KHz

Pilot subcarrier spacing Nf

8

[0049] This preferred embodiment specifically includes the following steps:

[0050] Step A: a pilot symbol generation step, constructing and ge...

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Abstract

The invention discloses a residual carrier deviation and sampling deviation estimation method and compensation method of a micro power wireless communication system based on OFDM (Orthogonal Frequency Division Multiplexing) modulation. The estimation method comprises the steps of generating a pilot symbol sequence, conducting symbol mapping, generating time-domain OFDM data symbols, sequentially extracting each OFDM symbol data by a receiving end and accurately conducting residual carrier deviation and sampling deviation estimation and tracking by using the pilot symbol sequence. The compensation method comprises the estimation method and a step of conducting phase compensation on effective data sub-carriers according to the estimated residual carrier deviation and sampling deviation to accurately recover the original transmission data symbols. By adopting a reasonably designed pilot scheme, complex micro power wireless environments can be effectively resisted, accurate estimation of the residual carrier deviation and the sampling deviation is realized, the sub-carriers of the OFDM system is enabled to satisfy the requirement on orthogonality all the time and thus the reliable receiving of OFDM data is effectively assisted.

Description

technical field [0001] The invention relates to the field of micro-power wireless communication, in particular to a method for estimating residual carrier deviation and sampling deviation of a micro-power wireless communication system based on OFDM modulation. Background technique [0002] In a general sense, as long as the communication sender and receiver transmit information through radio waves, and the transmission power is limited to a small range (usually below 100mw), it can be called micropower wireless communication. Micro-power wireless communication technology is supported by a complete standard system abroad, the main standards are IEEE 802.15.4 (LR-WPAN), EN13757 (network with relaying nodes), ZigBee, WSN, used in home wireless applications and energy in Europe and the United States metered data communications. But foreign standard technology is not suitable for our national conditions. [0003] With the rapid development of my country's smart grid, micro-powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38
Inventor 不公告发明人
Owner 深圳市力合微电子股份有限公司
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