US Patent 7564906 OFDM transceiver structure with time-domain scrambling

Patent 7564906 was granted and assigned to Nokia on July, 2009 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Nokia

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7564906

Date of Patent

July 21, 2009

Patent Application Number

10781041

Date Filed

February 17, 2004

Patent Primary Examiner

‌

Betsy L. Deppe

Patent abstract

A method and transceiver for wireless multicarrier communications. At the transmitter side, conventional OFDM symbols, after inverse fast Fourier Transform, are scrambled in time domain and then guard-interval (GI) inserted, up-converted at the carrier frequency for transmission. At the receiver side, after GI removal and frequency domain channel equalization, the received signal is transformed into time-domain by inverse fast Fourier Transform. The time-domain equalized signal is descrambled in time domain and then transformed back to the frequency domain before it is rate-matched, demodulated and decoded. This time-domain scrambling and descrambling method can be used in a wireless OFDM system such as WLAN, cellular OFDM, and MC-CDMA.

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