Decoding method and apparatus using channel state information for use in a wireless network receiver

US7359311B1 · kind B1 · utility

Assignee

• Cisco Technology, Inc. · US

Inventors

• Milind Paranjpe · Mountain View, US
• Brian D. Hart · Sunnyvale, US
• David Pignatelli · Saratoga, US
• Ender Ayanoglu · Irvine, US
• Eldad Perahia · Portland, US
• Philip J. Ryan · Sydney, AU
• Bretton Douglas · Sunnyvale, US
• Uri Parker · Shimshit, IL

Key dates

• Filing date: Apr 18, 2003
• Grant date: Apr 15, 2008
• Expiry date: Mar 19, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L5/0048
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A method, apparatus, and carrier medium for determining channel state information (CSI) in an OFDM radio receiver. The receiver is for receiving packets of OFDM data as a result of OFDM data being transmitted. The method includes forming an estimate of the channels of the subcarriers for received OFDM data to provide frequency responses of the channels of the subcarriers, and forming a measure of quality (“channel state information,” “CSI”) for the channels of the subcarriers based on the relative strength of the frequency responses. The forming of the CSI does not require estimating the relative amount of noise or interference in each channel. The formed CSI is used in demodulating and decoding received OFDM data.