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Method for symbol processing in a bi-directional communication by time reversal and communication unit for executing the method

A technology of time reversal and code elements, applied in the field of code elements, can solve problems such as no time division duplex

Active Publication Date: 2013-06-05
3G LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, no radiocommunication network based on time division duplex (more simply called time duplex) uses time reversal techniques to improve the quality of service in both uplink and downlink directions, whereas No need to resort to additional network resources

Method used

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  • Method for symbol processing in a bi-directional communication by time reversal and communication unit for executing the method
  • Method for symbol processing in a bi-directional communication by time reversal and communication unit for executing the method
  • Method for symbol processing in a bi-directional communication by time reversal and communication unit for executing the method

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Embodiment Construction

[0029] refer to figure 1 , the first communicating entity EC1 and the second communicating entity EC2 are adapted to communicate via the radio communication network RR.

[0030] In a first implementation, the radio communication network RR is a cellular digital radio communication network, for example of the GSM (Global System for Mobile Communications) or UMTS (Universal Mobile Telecommunications System) type, or a Wireless Local Area Network (WLAN) or WIMAX (Worldwide Interoperability for Microwave Access) The internet. One of said two communicating entities is then a base station and the other of said two communicating entities is a mobile radio terminal.

[0031] In a second implementation, the radio communication network RR is an ad hoc wireless local area network without infrastructure. The two communicating entities are two terminals communicating directly and spontaneously without an intermediary such as an access terminal or access point or a communication centraliz...

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Abstract

For processing symbols transmitted in frames and separated by guard slots via a propagation channel between first and second communicating entities (EC1, EC2) using time-division duplexing, the second entity (EC2) receives at least one pulse (IMP) transmitted by the first entity (EC1). The second entity estimates the impulse response of the propagation channel as a function of the pulse received and time reverses the estimated impulse response in order to filter the symbols as a function of the time-reversed impulse response. The second entity then transmits the modulated symbols and a second pulse to the first entity during a guard slot in a frame (TR2) in order to process the modulated symbols.

Description

technical field [0001] The invention relates, for example, to processing symbols transmitted in a Time Division Duplex (TDD) radio communication network using Orthogonal Frequency Division Multiplexing (OFDM) modulation. [0002] It relates more specifically to the introduction of time reversal techniques into such systems for communication in both uplink and downlink directions. Background technique [0003] Most laws of physics (and in particular those laws governing acoustics) are symmetric with respect to time. The time-reversed wave propagates like a forward wave going backwards in time. [0004] Time reversal is a technique for focusing waves (typically sound waves) that depends on the invariance of the wave equation over time reversal. A narrow pulse transmitted from a source propagates in an unknown propagation medium. A portion of this wave is typically picked up by a set of sensors known as a time reversal mirror (TRM), digitized, and time reversed before being ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26H04L25/02
CPCH04L5/0007H04L2025/03802H04L25/0212H04L25/03343H04L27/2607H04L27/2601H04L25/03114
Inventor 迪恩·T·潘海让-玛丽·乔弗雷
Owner 3G LICENSING SA
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