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Recursive Codeword Construction and PAPR Reduction Techniques for STBCs from Coordinate Interleaved Orthogonal Designs

Project ID: 1609-AP
Available for licensing

Background

Multiple-input multiple-out (MIMO) wireless communication techniques have become an important technique for advancing data rates, reliability, and coverage areas of wireless networks. One of the most important MIMO techniques and most prevalent in practice, is space-time block codes (STBCs). One problem with STBCs is that they are "full rate" only for a few special cases This keeps them from supporting the highest possible data rates for many antenna configurations of interest. An important new class of codes, generated from coordinate interleaved orthogonal designs (CIODs), appears to be able to solve this problem. While promising, there are two important problems with codes from ClODs: it is not clear how to systematically generate the appropriate codewords for different antenna array sizes, and the codes suffer from a high peak-to-average power ratio (PAPR) causing inefficiencies.

Invention Description

We propose a novel codeword construction rule to systematically generate full-diversity full-rate (FDFR) space-time block codes (STBCs) from CIODs in a recursive manner. Starting from a 2 x 2 CIOD, FDFR asymmetric CIODs (FDFRACIODs) as well as FDFR-CIODs can be easily constructed for any number of transmit and receive antennas. Furthermore, based on the recursively constructed codes, a simple but effective peak-to-average power ratio (PAPR) reduction technique is proposed, showing an advantage over the existing FDFRCIODs/ ACIODs in terms of practical implementation.

Benefits

The recursively constructed CIODs and ACIODs can achieve full-diversity and full rate.
The proposed method can be also applied to produce asymmetric CIODs with various number of transmit antennas.
The proposed technique is capable of effectively reducing the antenna turn-off probability to 0%, which indicates that, in terms of practical implementation, the proposed technique is superior to existing codes.
The codeword construction rule is easily established starting from the simplest 2 x 2 COIDs.

Features

The CIODs and ACIODs have the same properties as as conventional CIODs/ACIODs including diversity and coding gains, maximum mutual information, delay and rate, and single- or double-symbol decodability.

Market Potential/Applications

IEEE 802.l6e ("WiMAX"), UMTS Long Term Evolution (LTE), and related wireless standards

UT Researcher

Jeffrey G. Andrews, Ph.D., Electrical and Computer Engineering, The University of Texas at Austin
Edward J. Powers, Jr., Electrical and Computer Engineering, The University of Texas at Austin
Hoojin Lee, Electrical and Computer Engineering, The University of Texas at Austin

OTC Contact Information

Jitendra Jain, Licensing Specialist
jjain@otc.utexas.edu
512-471-9055