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Method for transmitting a digital signal for a marc system with a half-duplex relay, and corresponding program product and relay device

A technology of digital signals and program instructions, which is applied in the performance field of network coding and error correction decoding, can solve problems such as network capacity limitations and non-optimal use of spectrum resources, and achieve the effect of increasing spectrum efficiency

Active Publication Date: 2012-07-25
FRANCE TELECOM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the constraint of imposing orthogonal links leads to non-optimal utilization of spectrum resources and thus to limitations on network capacity

Method used

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  • Method for transmitting a digital signal for a marc system with a half-duplex relay, and corresponding program product and relay device
  • Method for transmitting a digital signal for a marc system with a half-duplex relay, and corresponding program product and relay device
  • Method for transmitting a digital signal for a marc system with a half-duplex relay, and corresponding program product and relay device

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Embodiment Construction

[0069] The present invention proposes a novel way to use such as Figure 4 The relays of the MARC system shown come in as Figure 5 The shown method 1 of the present invention improves the spectral efficiency of the transmission while still enabling simple and efficient decoding at the receiver.

[0070] There are no constraints on the transmission channel; it can experience fast or slow fading, it can be frequency selective, and it can be a multiple-input multiple-output (MIMO) channel. In the following description, the two sources, relays, and destinations are assumed to be perfectly synchronized, and the two sources are independent (no dependencies exist between them).

[0071] The following symbols are used in this application.

[0072] Use bold characters to write all vectors.

[0073] A vector v has a value written as [v] k or v k its kth element.

[0074] The multidimensional function F selects a matrix A of dimension m×q as input, where each element a ij (for al...

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Abstract

The invention relates to a method (1) for transmitting a digital signal to a network with at least four nodes comprising two transmitters, a relay and a receiver, separated from one another by non-orthogonal links using a spatially distributed network code. The method includes the following steps: a step (2) in each transmitter, delivering a code word comprising first and second redundancy parts per block of K data bits, whereby the first part can be decoded independently of the second part; a step (3) comprising the transmission in the transmitters of the first part of the code word over aN, a is an element of a set [0,1] transmission intervals; a step (4) comprising combined iterative detection / decoding in the relay, in order to separate the flux originating from the transmitters and to determine, for each flux, a vector representative of the K data bits associated with the code word; a step (5) comprising the combined encoding in the relay of the two vectors in order to determine a redundancy datum; providing an order in the transmitters in order to transmit the second redundancy part over (1 - a )N, a is an element of a set [0, 1] subsequent transmission intervals; and providing an order in the relay in order to transmit (6) the redundancy datum over the (1 - a)N, a is an element of a set [0,1] subsequent transmission intervals.

Description

technical field [0001] The field of the invention is that of transmitting coded data in Multiple Access Relay Channel (MARC) networks. A MARC network is a telecommunications system with at least four nodes including at least two transmitters, relays, and receivers. More precisely, the invention relates to network coding and involves improving the quality of data transmission and, in particular, improving the performance of error correction decoding in receivers. [0002] The invention applies in particular, but not exclusively, to the transfer of data via mobile networks, eg in real-time applications. Background technique [0003] Networks, especially mobile networks, are looking for significant increases in capacity, reliability, energy consumption, and more. The transmission channels of mobile networks are notoriously difficult and result in relatively poor transmission reliability. In recent years, significant advances have been made in coding and modulation, especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/00H03M13/37H04B7/26
CPCH03M13/3761H04L1/0076H03M13/1515H04B7/15521H04B7/15592H03M13/2957H03M13/15H04L1/0048H03M13/3746H03M13/235H03M13/152H03M13/1102H03M13/1171H04L2001/0097H04L25/03331H04L1/06H04L1/0057
Inventor A.哈特费R.维索兹A.伯赛特
Owner FRANCE TELECOM SA
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