Means and method for a synchronous network communications system

• US 6,377,640 B2
• Filed: 07/31/1998
• Issued: 04/23/2002
• Est. Priority Date: 07/31/1997
• Status: Expired due to Fees

• Current Assignee: Bc Leow
• Original Assignee: Stanford Syncom Incorporated
• Inventors: Trans, Francois
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): BURD, KEVIN MICHAEL
• Application Number:
  US09/127,383
• Publication Number:
  US 20010038674A1
• Time in Patent Office: 1,362 Days
• Field of Search: 375/354, 375/355, 375/356, 370/503, 370/286, 370/299, 348/500, 358/409
• US Class Current: 375/354
• CPC Class Codes: H04B 1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0047 Decoding adapted to other signal detection operation in conjunction with sequence estimation or equalization H04L25/03286
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 25/085 Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
• CPC Class Codes: H04L 25/14 Channel dividing arrangements , i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
• CPC Class Codes: H04L 25/497 by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems transversal equalizers at the transmitter end H04L25/03343
• CPC Class Codes: H04L 7/0008 Synchronisation information channels, e.g. clock distribution lines

Abstract

Nodes on a network are synchronized with each other using a clock transfer system. The communications channels between the nodes are then measured and calibrated for optimal bandwidth. The optimized channels and synchronization enables a new form of signaling based on precise control of the frequency, amplitude, and phase of the waveform of the signal. Receiving nodes receive information in order to locate the signal at the appropriate frequency, phase and amplitude. Precision control of these parameters also servers as a unique signature of the transmitting node preventing security breaches as the signal'"'"'s characteristic are unique to the transmitting node. The channel is continuously updated with a precision control system to insure that the nodes are not out of phase.

Claims

1. A method for increasing bandwidth of signals between a transmitting node and a receiving node coupled over a communications channel comprising the steps of:

receiving time synchronization data;

synchronizing the transmitting and receiving node using the synchronization data received;

measuring the capacity of the communications channel between the nodes;

calibrating the communications channel to remove an intrinsic skew and an extrinsic skew, including the steps of;

calculating an internal phase offset and an internal frequency offset for the communication channel using a first reference signal to identify said intrinsic skew,

internally calibrating the channel using said internal phase offset and said internal frequency offset to substantially remove said intrinsic skew,

calculating an external phase offset, an external frequency offset and a distortion delay variation for the communication channel using a first reference signal to identify said extrinsic skew,

measuring a value of a power sum near end cross talk over the communications channel representing interference from a second communication channel; and

externally calibrating the channel using said external phase offset, said external frequency offset, said distortion delay variation, and said power sum near end cross talk to substantially remove said extrinsic skew;

equalizing channel and signal distortions;

coding the signal to the amplitude and frequency of the receiving node;

sampling clock signals of the nodes; and

delivering phase delay control to the nodes in response to the sampled clock signal of one of the nodes exceeding a phase interval.

3. The method of claim 1, further comprising the step of:

measuring a value of a power sum far end cross talk over the communications channel representing a ratio of signal attenuation to a far end cross talk;

wherein said step of externally calibrating the channel uses said power sum far end cross talk.

2. A system for increasing bandwidth of signals between a transmitting node and a receiving node coupled over a communications channel comprising the steps of:

receiving means for receiving time synchronizing data;

synchronizing means for synchronizing the transmitting and receiving node using the synchronization data received;

measuring means for measuring the capacity of the communications channel between the nodes;

calibrating means calibrating the communications channel to remove an intrinsic skew and an extrinsic skew, including the steps of;

internal phase offset means for calculating an internal phase offset and in internal frequency offset for the communication channel using a first reference signal to identify said intrinsic skew,

internal calibrating means for internally calibrating the channel using said internal phase offset and said internal frequency offset to substantially remove said intrinsic skew,

external phase offset means for calculating an external phase offset, an external frequency offset and a distortion delay variation for the communication channel using a first reference signal to identify said extrinsic skew,

near cross talk measuring means for measuring a value of a power sum near end cross talk over the communications channel representing interference from a second communication channel; and

external calibrating means for externally calibrating the channel using said external phase offset, said external frequency offset, said distortion delay variation and said power sum near end cross talk to substantially remove said extrinsic skew;

equalizing means for equalizing channel and signal distortions;

coding means for coding the signal to the amplitude and frequency of the receiving node;

sampling means for sampling clock signals of the nodes; and

control means for delivering phase delay control to the nodes in response to the sampled clock signal of one of the nodes exceeding a phase interval.

4. The system of claim 2, further comprising:

far end cross talk measuring means for measuring a value of a power sum far end cross talk over the communications channel representing a ratio of signal attenuation to a far end cross talk;

wherein said external calibrating means calibrates the channel using said power sum far end cross talk.