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Channel adaptive equalization precoding system and method

a precoding system and channel technology, applied in the field of channel adaptive equalization precoding system and method, can solve the problems of circuit-switched network, inflexible data service provision, and difficulty in interoperability and integration of these technologies

Inactive Publication Date: 2003-05-08
TRANS FRANCOIS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022] With this higher SNR margins, the present invention can be used to increase the higher performance and data rate capacity of the channel or to reduce the cost of the channel. For example, increasing the SNR results in simpler Forward Error Correction (FEC) and filtering schemes that reduce the design complexity which leads to power savings and die size reduction. This can be used in higher performance applications such as higher speeds or longer distance. In the higher data rate applications, the enhanced SNR coupled with the multi-channel signal coding can be used to deliver the increased bandwidth. As an example in longer distance or higher speeds for 1000BaseT application, with Com2000.TM. Speed technology, the new transceiver can deliver 1000 Mb / s over 200 meters vs. 100 meter 802.3ab standard for longer distance applications or 2000 Mb / s vs. 1000 Mb / s standard for higher speed applications respectively. As an example for HDSL2 application, the new transceiver can deliver 1.5 Mb / s over 18 Kft vs. 12 Kft HDSL2 T1 / E1 standard for longer distance applications or 3 Mb / s vs. 1.5 Mb / s standard for higher speed applications.
[0064] The signal's signature is composed of both the waveform signal itself and the content of the waveforms. The security system transmits the signature of the waveform by pre-positioning the signal at a specific frequency and phase matrix cell. The signal signature of the waveform's content is provided via the pseudo-random noise (PN) signature for each node of the network. The PN auto correlation will be exercised for multi user ID access. This PN signature provides network security by prohibiting any unauthorized intrusion by validating the signature, or E-DNA, of the sending node.

Problems solved by technology

With all of the above technologies, the interoperable and integration of these technologies is difficulty since there is no "Unified" or common architecture that the mentioned communication means can seamlessly be integrated with.
The capacity of the backbone and edge network links has been the main bottleneck in a data and telecommunication system.
Traditionally, circuit-switched networks which are only available for the telecommunication infiastructure, have been too inflexible to provide a data service that is suitable for a wireline data communication and wireless data communication integrated services network.

Method used

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  • Channel adaptive equalization precoding system and method
  • Channel adaptive equalization precoding system and method
  • Channel adaptive equalization precoding system and method

Examples

Experimental program
Comparison scheme
Effect test

case 1

[1591] PAM Signal

[1592] Suppose that the measured channel plus background noise for the i-th trial is

C(i)=H+N(i)

[1593] where C(i)=[c.sub.1(i),c.sub.2(i), . . . , c.sub.L(i)].sup.T, H=[h.sub.1, h.sub.2, . . . , h.sub.L].sup.T is the sampled (in symbol rate) vector of the channel impulse response, and [.].sup.T denotes the transpose of [.]. Here, we assume perfect time synchronization so that H appears the same regardless of the trial index i. N(i)=[n.sub.1(i), n.sub.2(i), . . . , n.sub.L(i)].sup.T is the noise vector.

[1594] Assuming that the numbers of taps in THP and FFE are N.sub.THP and N.sub.FFE, respectively, we construct two N.sub.FFE.times.(L+N.sub.FFE-1) matrices, .PHI..sub.C(i) and .PHI..sub.H, as 15 C( i ) = [ c 1( i ) , c 2( i ) , , c L( i ) , 0 , 0 , , 0 0 , c 1( i ) , c 2( i ) , , c L( i ) , 0 , , 0 0 , 0 , , 0 , c 1( i ) , c 2( i ) , , c L( i ) ] H = [ h 1 , h 2 , , h L , 0 , 0 , , 0 0 , h 1 , h 2 , , h L , 0 , . , 0 0 , 0 , , 0 , h 1 , h 2 , , h L ]

[1595] To evaluate ...

case 2

[1601] QAM Signal

[1602] The following calculation follows a note "Notes on Calculation of QAM DFE" (J. F. Weng, July 1999) which is a little bit different from that used in "DSL Simulation Techniques and Standards Development for Digital Subscnber Line Systems" (W. Y. Chen, 1998) for calculating the optimum weight coefficients in QAM. (Comparison will be done later to see the difference and the effect on performance)

[1603] The calculation can be shown similar to that for PAM signal discussed above while bearing in mind that the signals discussed below for QAM signals are all complex-valued signals.

[1604] Suppose that the measured channel plus background noise for the i-th trial is

C(i)=H+N(i)

[1605] where C(i)=[c.sub.1(i), c.sub.2(i), . . . , c.sub.L(i)].sup.T, H=[h.sub.1, h.sub.2, . . . , h.sub.L].sup.T is the sampled (in symbol rate) vector of the channel impulse response, and [.].sup.T denotes the transpose of [.]. Here, we assume perfect time synchronization so that H appears the...

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Abstract

A system and method for delivering increased speed, security, and intelligence to wireline and wireless systems. The present invention includes a new generation Fast Circuit Switch (packet / circuit) Communication processors and platform which enables a new Internet Exchange Networking Processor Architecture at the edge and core of every communication system, for next generation Web Operating System or Environment (WOE) to operate on with emphasis of a non-local processor or networking processor with remote web computing capabilities.

Description

I. RELATED APPLICATIONS[0001] This application is a divisional of U.S. patent application Ser. No. 09 / 847,097, filed on May 1, 2001, attorney reference 6001, which is a divisional of U.S. patent application Ser. No. 09 / 550,395, filed on Apr. 14, 2000, attorney reference 4871.[0002] U.S. patent application Ser. No. 09 / 550,395 is a continuation-in-part of U.S. provisional application Ser. No. 60 / 170,455, filed on Dec. 13, 1999, attorney reference 4630.[0003] U.S. patent application Ser. No. 09 / 550,395 is also a continuation-in-part of U.S. patent application Ser. No. 09 / 444,007, filed on Nov. 19, 1999, attorney reference 4571; which is a continuation-in-part of U.S. patent application Ser. No. 09 / 417,528, filed on Oct. 13, 1999, attorney reference 4511; which is a continuation-in-part of U.S. provisional application No. 60 / 104,316, filed on Oct. 13, 1998, attorney reference 3659; and which is a continuation-in-part of U.S. provisional application No. 60 / 109,340, filed on Nov. 20, 1998...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/00H04B3/32H04J3/06H04L1/00H04L1/20H04L7/00H04L25/03H04L25/08H04L25/14H04L25/497
CPCH04B1/00H04L2025/03509H04J3/0638H04L1/0002H04L1/0054H04L1/20H04L1/205H04L5/0007H04L5/143H04L5/16H04L7/0008H04L25/03038H04L25/085H04L25/14H04L25/497H04L2025/03363H04L2025/0349H04B3/32
Inventor TRANS, FRANCOISNGOC, THO L.
Owner TRANS FRANCOIS
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