US Patent No: 5,625,651
Number of patents in Portfolio can not be more than 2000
Discrete multi-tone data transmission system using an overhead bus for synchronizing multiple remote units
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Apr 29, 1997
Issued date -
Jun 2, 1994
filing date -
08/252,829
serial no -
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Abstract
A bi-directional data transmission system that facilitates communications between a central unit and a plurality of remote units using a frame based discrete multi-tone (DMT) transmission scheme is disclosed. The discrete multi-tone data transmission system has a multiplicity of discrete subchannels including an overhead bus. In a method aspect of the invention, frames transmitted from the plurality of remote units are synchronized at the central unit. When a selected remote desires to initiate communications, it loop times it own clock to the clock of the central unit and transmits a remote initiated synchronization signal to the central unit over a dedicated overhead subchannel in the overhead bus. The central unit responds with a centrally initiated synchronization signal that contains information indicative of a frame boundary phase shift required to synchronize the selected first remote unit with other remote units that are currently communicating with the central unit. The remote responds by shifting the phase of the frames it outputs by an amount indicated by the centrally initiated synchronization signal. This synchronizes the frame boundaries of the frames outputted by the selected remote unit with frame boundaries of frames output by the other remote units that are currently communicating with the central unit. The synchronization is arranged to occur such that the frame boundaries from the various remotes substantially coincide when they are received at the central unit. Specific central and remote modem designs suitable for implementing such a system are also described.
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First Claim
Related Publications
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
| Patent Owner | Address | Total Patents |
|---|---|---|
| AMATI COMMUNICATIONS CORPORATION | SAN JOSE, CA | 25 |
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Inventor(s)
| Inventor Name | Address | # of filed Patents | Total Citations |
|---|---|---|---|
| Cioffi, John M | Atherton, CA | 104 | 2797 |
Cited Art
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Patent Citation Ranking
Forward Cites
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 7,675,843 Multipoint-to-point communication using orthogonal frequency division multiplexing | 1 | 2007 | |
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| 7,443,784 Methods and systems for tone hopping | 24 | 2007 | |
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| 8,351,321 Systems and method for orthogonal frequency divisional multiplexing | 0 | 2007 | |
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| 8,089,853 Systems and method for orthogonal frequency divisional multiplexing | 0 | 2007 | |
| 7,995,454 Systems and method for orthogonal frequency divisional multiplexing | 4 | 2007 | |
| 7,957,265 Systems and method for orthogonal frequency divisional multiplexing | 1 | 2007 | |
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| 8,213,398 Method for multiple use subchannels | 0 | 2009 | |
| 8,213,399 System for multiple use subchannels | 0 | 2009 | |
| RE41771 System for multiple use subchannels | 0 | 2009 | |
| RE42236 Multiuse subcarriers in multipoint-to-point communication using orthogonal frequency division multiplexing | 0 | 2009 | |
| RE43667 System for multiple use subchannels | 0 | 2011 | |
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| 7,957,965 Communication system noise cancellation power signal calculation techniques | 0 | 2008 | |
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| 5,903,612 Method to synchronize data and a transmitter and a receiver realizing said method | 6 | 1997 | |
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Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |