US Patent No: 8,229,036
Number of patents in Portfolio can not be more than 2000
Characterizing channel response using data tone decision feedback
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Jul 24, 2012
Issued date -
Dec 19, 2008
filing date -
12/340,596
serial no -
In Force
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Abstract
Characterizing channel response using data tone decision feedback. In addition, to pilot tones which may be existent within an orthogonal frequency division multiplexing (OFDM) signal, one or more data tones within that same signal may be employed to assist with channel estimation (alternatively, detection). Once a data tone qualifies as a pseudo-pilot tone, it may be used with the pilot tones for channel estimation. A qualifier considers slicer error associated with hard decisions for a data tone to determine if it is a candidate for assistance within channel estimation. A frame within an OFDM signal may, in one situation, include no pilot tones at all, and a previously calculated channel estimate may be used to process that frame. In addition, fewer pilot tones than needed to perform accurate channel estimation (based on the channel delay spread) may be employed by using one or more pseudo-pilot tones (e.g., qualified data tones).
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 7,139,331 Characterizing channel response in a single upstream burst using redundant information from training tones | 3 | 2002 | |
| 2003/0012,127 Detection and mitigation of temporary (bursts) impairments in channels using SCDMA | 6 | 2002 | |
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| 7,035,329 Soft slicer in a hybrid decision feedback equalizer | 7 | 2002 | |
| 7,701,917 Channel estimation for a wireless communication system with multiple parallel data streams | 7 | 2004 | |
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| 7,292,651 Pilot-aided channel estimation for OFDM in wireless systems | 34 | 2003 | |
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| 6,901,125 Method for error compensation in an OFDM system with diversity | 3 | 2002 | |
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| 7,397,758 Channel tracking in a OFDM wireless receiver | 17 | 2004 | |
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| 7,995,688 Channel estimation and ICI cancellation for OFDM | 3 | 2008 | |
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| 7,352,829 Data-aided channel estimation | 5 | 2004 | |
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| 7,649,830 Hybrid type channel estimation method and system for mobile environment | 1 | 2005 | |
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| 8,031,786 Method and system for improving channel estimation in a communications network | 2 | 2007 | |
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| 2008/0151,989 Quasi-Pilot Symbol Substitution | 4 | 2005 | |
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| 7,130,587 Communication quality estimation method, communication quality estimation apparatus, and communication system | 26 | 2002 | |
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| 2004/0219,945 Increasing effective number of data tones in a multi-tone communication system | 2 | 2003 | |
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