发明授权
- 专利标题: Channel tracking in an OFDM wireless receiver
- 专利标题(中): OFDM无线接收机中的信道跟踪
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申请号: US12130368申请日: 2008-05-30
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公开(公告)号: US07821915B2公开(公告)日: 2010-10-26
- 发明人: Brian Hart , David J. Pignatelli , Eldad Perahia , Paul C. P. Dankoski
- 申请人: Brian Hart , David J. Pignatelli , Eldad Perahia , Paul C. P. Dankoski
- 申请人地址: US CA San Jose
- 专利权人: Cisco Technology, Inc.
- 当前专利权人: Cisco Technology, Inc.
- 当前专利权人地址: US CA San Jose
- 代理机构: Inventek
- 代理商 Dov Rosenfeld
- 主分类号: H04J11/00
- IPC分类号: H04J11/00
摘要:
An apparatus and a method to track the channel response for subcarriers in an OFDM receiver for a packet of information that includes a known transmitted part. The receiver has a signal-to-tone transformer to determine subcarriers corresponding to a received packet. The method stores a function of an initial estimate of the channel response for a subcarrier, and accepts a pre-decision constellation point value that is a post channel correction using a first estimate of the channel response. The method includes: makes a decision using the pre-decision constellation point value, re-modulates the decision to form a post-decision constellation point value, and forms a complex valued product of the function of the first estimate for the subcarrier and the complex-valued ratio of the pre-decision and post-decision values. This complex valued product forms a measure of the current channel estimate to use for updating the stored quantity.
公开/授权文献
- US20080232497A1 CHANNEL TRACKING IN AN OFDM WIRELESS RECEIVER 公开/授权日:2008-09-25