Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Multiplexer-related

Learning-sequence-for-estimating-a-transmission-channel-and-corresponding-estimator-device

Synchronizing method in a mobile radio system

The present invention is based on the time sharing in different frames of the traffic flow (TDMA-...

Data processor with sets of two registers where both registers receive identical information and when context changes in one register the other register remains unchanged

In general, one form of the invention is a data processing device including an instruction decoder ...

Method for adjusting clocks of multiple data processors to a common time base

As herein described, according to one aspect of the invention, there is provided a method for ...

Sequential decoder for decoding of convolutional codes

The decoding of a convolutional code with known channel parameters can be viewed as a tree-search ...

Method for recognizing digital information in transmission in mobile radio communications systems

I claim: 1. A method for recognizing digital information of a digital information element in a ...

Ground device for communicating with an elevated communication hub and method of operation thereof

OF THE DRAWINGS The method and apparatus of the present invention provides inexpensive and ...

Control and telemetry signal communication system for geostationary satellites

Briefly, this invention contemplates the provision of a geosynchronous satellite control and ...

Circuit for extracting carrier signals

OF THE INVENTION With the receiver comprising a carrier-reproducing circuit 10, shown in FIG. 1, ...

Method and system for fast access to an uplink channel in a mobile communication network

The present invention comprises a method and system for obtaining fast access to a multiplexed ...

System and method for establishing a direct call path for routing a signal to a data network using a digital loop carrier

Communications Systems FIG. 1 is a schematic block diagram of a system 100 for sending telephony ...

Learning sequence for estimating a transmission channel and corresponding estimator device

Details

Inventors: Mourot, Christophe; Wautier, Armelle; Dany, Jean-Claude;
Assignee: Alcatel N.V. (Amsterdam, NL)
Primary Examiner: Ramirez; Ellis B.
Assistant Examiner: Shah; Kamini
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas

The present invention concerns a learning sequence for estimating a transmission channel and an estimator device adapted to use a sequence of this kind. The learning sequence for estimating a transmission channel of length L comprises a guard sequence of length L followed by a reference sequence of length N such that its total length N+L is greater than or equal to 2L+1 and such that the transmission matrix A associated with it defined by the product of the Hermitian transpose A.sup.H of the transmission matrix by the transmission matrix A is inversible.

DETAILED DESCRIPTION What is claimed is: 1.
A learning sequence of symbols for estimating a transmission characteristic of a transmission channel of length L on which said sequence is transmitted, said sequence comprising: a guard sequence of length L, and a reference sequence of length N following said guard sequence; wherein the learning sequence is selected to have a total length N+L greater than or equal to 2L+1; wherein the learning sequence is selected so that a transmission matrix A, associated with the learning sequence, is such that the product of the Hermitian transpose A.
sup.
H of the transmission matrix by the transmission matrix A is inversible; and wherein the length L is defined as the number of symbol periods equivalent to the difference between the longest and shortest transmission paths of the channel.
2.
Learning sequence according to claim 1 characterized in that the product of the Hermitian transpose A.
sup.
H of the transmission matrix by the transmission matrix A is a multiple of the identity matrix.
3.
Learning sequence according to claim 2 characterized in that said reference sequence is a constant amplitude zero auto-correlation (CAZAC) sequence.
4.
Learning sequence according to claim 3 characterized in that said CAZAC sequence is a polyphase sequence.
5.
Learning sequence according to claim 1 characterized in that said reference sequence is a constant amplitude zero auto-correlation sequence near the correlation peak (pseudo-CAZAC sequence).
6.
A device for estimating a transmission characteristic of a transmission channel of length L receiving at one end of said channel a training sequence corresponding to a learning sequence produced at the other end of the channel, wherein said learning sequence comprises a guard sequence of length L followed by a reference sequence of length N so that the learning sequence has a total length N+L greater than or equal to 2L+1 and so that a transmission matrix A associated with the learning sequence is such that a resulting matrix, which is the product of the Hermitian transpose A

Related patents

	Method for receiving multicarrier digital signals An important consideration in the context of such systems is to find a system-conformal signal in the situation where a receiver is switched on or is tuned into another ...
	Peak to average power ratio reduction The present inventions provide methods and systems for estimating the distortion of a received signal. Generally, any type of distortion may be estimated in order to ...
	Compensation method for I/Q channel imbalance errors OF THE PREFERRED EMBODIMENT Generally, the invention contemplates a method by which correctable I/Q imbalance errors in a complex receiver can be detected and ...
	Self-calibrating, self-correcting transceivers and methods The present invention is directed to a self-calibrating, self-correcting transceiver. This goal is achieved with a signal processor which can inject calibration signals ...
	Multi-channel serdes receiver for chip-to-chip and backplane interconnects and method of operation thereof To address the above-discussed deficiencies of the prior art, the present invention provides a multi-channel serdes receiver, a method of operating the receiver and an ...
	Radiation thermometers We claim: 1. A method of monitoring at least one temperature characteristic of a rotating body, comprising sensing radiation emitted by the body in wavelength bands ...
	Method and apparatus for determining signal strength in a variable data rate system The present invention determines signal strength in a variable rate communication system in a rate independent manner. In the preferred embodiment of the present ...
	Method of signal transmission in a mobile communication system Therefore, an object of the present invention is to provide a method of signal transmission between radio base stations in a mobile communication system, with which the ...
	Monolithic integrated optical time delay network for antenna beam steering The present invention seeks to provide an optical time delay network for phased array antennas that is lighter and more compact than previous systems, does not suffer ...
	Method and apparatus for measuring idle channel quality in an RF frequency sharing environment The present invention addresses this need by providing a method and apparatus for measuring idle channel quality in a radio frequency (RF) system. The method of ...

0.034
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved