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Differential space-time coding method

A coding method and component technology, applied in the direction of error prevention, error prevention/detection through diversity reception, transmission system, etc., can solve the problem that it is difficult for the receiving end to recover phase information items, detect symbol inversion, and do not support signed pulses transmission and other issues

Inactive Publication Date: 2014-06-11
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Given the short pulse duration and wide UWB pulse signal bandwidth, it is difficult to recover the phase information items at the receiving end, especially to detect sign inversion
Also, for some MIMO systems, the transmission of signed bursts is not supported

Method used

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Embodiment Construction

[0130] The basic idea of ​​the invention is to devise a differential space-time code in which the coding diversity is obtained by permutation operators acting on the modulation positions of the information symbols belonging to the 2-PPM (also called binary PPM) symbol set.

[0131] In the following a pulsed UWB transmitter system using P transmitter antennas (more generally, P radiating elements) will be considered. The space-time code used by this system is defined by the following matrix of size P × 2P:

[0132] If P=2, then:

[0133] C k = c k , 1 c k ...

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Abstract

The method involves coding a block of information symbols of a double pulse position modulation alphabet into a sequence of two vectors with two components. The vectors are obtained from code matrix elements such as Ck, Ck1, Ck2 and Ck2omega, where the Ck is matrix and defined by permutation of rows and / or columns of the matrix and omega is permutation of two positions of pulse position modulation. The row of the matrix corresponds to utilization of a transmission channel and the column of the matrix corresponds to a set of radiative elements (540-1, 540-2) e.g. laser diodes. Independent claims are also included for the following: (1) an ultra-wideband transmission system comprising a coding unit for coding a block of two information symbols of a double pulse position modulation alphabet into a sequence of two vectors with two components (2) an ultra-wideband receiving system comprising a set of sensors for receiving an impulsive ultra-wideband signal transmitted by a transmission system.

Description

technical field [0001] The present invention relates to the field of space-time coding (or STC) for multi-antenna systems, especially for applications in ultra-wideband (or UWB) telecommunications. Background technique [0002] Multiple antenna type wireless communication systems are well known in the art. These systems use multiple transmit and / or receiver antennas and are called MIMO (Multiple Input Multiple Output), MISO (Multiple Input Single Output) or SIMO (Single Input Multiple Output), depending on the type of architecture employed. Below we will use the term MIMO to cover the above MIMO and MISO variants. The use of space diversity on the transmit and / or receive side enables these systems to provide significantly better channel capacity than conventional single-antenna systems (or SISO - single input single output). This space diversity is usually supplemented by time diversity using space-time coding. In this encoding, the information symbols to be transmitted a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/49H04B1/7163H04B1/7176H04B1/69
CPCH04B1/71635H04B1/7176H04L1/0612H04L25/4902H04L1/0668H04B7/0413
Inventor C·阿布尔杰利
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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