Wireless communication device

A wireless communication device and signal technology, applied in multiplex communication, electrical components, transmission systems, etc., can solve problems such as time-varying DC offset and IQ imbalance, etc.
CN101076004AInactive Publication Date: 2007-11-21SONY CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SONY CORP
Publication Date
2007-11-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a wireless communication device for receiving a package constituted by signal modulated by OFDM. A band-pass filter pick up OFDM signal of desired frequency band. The desired OFDM signal is amplified by low-pass amplifier based on the gain controlled by the received signal intensity. A frequency converter down-converses the FDM signal into baseband signal. An A / D converter converses the baseband signal into digital signal. A first high pass filter removes DC deviation from baseband signal corresponding to preset preamble of the package. A frequency shift etimator estimates frequency shift from the sampled signal which has removed DC deviation from baseband signal by the first high pass filter. A frequency shift corrector removes the estimated frequency shift from the baseband signal. A demodulator demodulates the subcarrier signal in the frequency domain from baseband signal which is compensated with frequency shift.
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Description

[0001] Cross References to Related Applications

[0002] The present invention consists of Japanese patent applications JP 2006-137047 filed with the Japan Patent Office on May 16, 2006, JP 2007-037719 filed with the Japan Patent Office on February 19, 2007, and JP 2007-037719 filed with the Japan Patent Office on April 17, 2007 Subject matter of JP2007-108046 filed, the entire contents of which are hereby incorporated by reference. technical field

[0003] The present invention relates to wireless communication devices for receiving radio frequency (RF) signals modulated by Orthogonal Frequency Division Multiplexing (OFDM). In particular, the present invention relates to wireless communication devices for receiving signals using a direct conversion architecture that does not utilize an intermediate frequency (IF) stage.

[0004] More particularly, the present invention relates to a wireless communication device for removing a frequency offset and demodulating OFDM symbols us...

Claims

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