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Using artificial signals to maximize capacity and secrecy of multiple-input multiple-output (MIMO) communication

a technology of artificial signals and communication, applied in the field of theoretical, ideal, multipleinput multipleoutput (mimo) antenna system, to achieve the effect of improving the spectral efficiency of the transmission channel, speeding up the data rate, and improving the performance of the mimo system

Active Publication Date: 2019-12-12
UNIV OF SOUTH FLORIDA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a system and method for improving the capacity and security of MIMO transmitters that use analog or digital beamforming to communicate in a digital MIMO communication system. The method involves selecting a precoding / combining matrix pair based on an estimated channel coefficient of a transmission channel, and generating an artificial signal from an information signal to be transmitted by the MIMO transmitter to minimize errors between the transmitted and recovered signals. The MIMO transmitter can increase the capacity of the system and provide secrecy by tailoring the transmitted signal to the transmission channel of the intended receiver. The invention can be implemented without modifying the receiving hardware, and can lead to faster data rates, increased connectivity, and lower energy consumption.

Problems solved by technology

Additionally, the artificial signal is generated by performing convex optimization, wherein the artificial signal is designed to match desired data symbols as much as possible upon transmitting the plurality of artificial signals and after applying the combining matrix to the plurality of received artificial signals at the desired receiver, while being limited by a power limitation.

Method used

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  • Using artificial signals to maximize capacity and secrecy of multiple-input multiple-output (MIMO) communication
  • Using artificial signals to maximize capacity and secrecy of multiple-input multiple-output (MIMO) communication
  • Using artificial signals to maximize capacity and secrecy of multiple-input multiple-output (MIMO) communication

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first embodiment

[0039]In a first embodiment, adding artificial signals to data symbols that forces the error to be zero is examined. In this embodiment, adding an artificial signal n to the information symbols {tilde over (x)}, prior the precoder, is proposed, such that ϵ is reduced, i.e.

x=Vi({tilde over (x)}+n)

[0040]In this first embodiment, n=nZF where

U*iUΛV*VinZF=−ϵ

U*iUΛV*VinZF=−(U*i−U*)UΛV*(Vi−V){tilde over (x)}

nZF=−(U*iHVi)−1(U*i−U*)H(Vi−V){tilde over (x)}

[0041]However, as in all zero forcing cases, this operation is not power limited and as such, may yield artificial signal vectors having power that is greater than the power of the signal itself, which cannot be transmitted.

second embodiment

[0042]In a second embodiment, adding power limited artificial signals to the data symbols, wherein the power limited artificial signal is obtained using convex optimization, is considered.

[0043]In this second embodiment, to prevent the unlimited power case and limit the transmitted power, one can also compute and add the artificial signal that does not completely eliminate, but minimizes, the mean of the square of e, such that the power of the vector input to the precoder of the transmitter is unity. Then, the power is divided between the actual signal and the artificial signal. If the actual signal power is limited to 1−α and the artificial signal power is limited to α, then:

n=argmin⋁Ui*UΛV*Vi*[(1-α)x~+α]-Λx~2subjectto2≤N

[0044]Where n is the artificial signal to be added to the ideal signal and N is the number of transmitting antennae of the MIMO transmitter. In this embodiment, the optimization is convex and is practically highly feasible.

[0045]However, the power of the artificial...

fifth embodiment

[0051]Furthermore, in case of full digital beamforming, if the precoding operation is performed completely in software and not using a fixed hardware, the artificial signal is designed in the fifth embodiment as:

x=argminn⋁Ui*UΛV*Vi*-Λx~2subjectto2≤N

[0052]The fifth embodiment of the present invention reduces computational complexity, power consumption and processing delay without any change in performance. If precoding is applied using a fixed hardware, the fourth embodiment may still be used by applying only a software upgrade to devices that are already produced and in use.

[0053]FIG. 1A illustrates an ideal precoded / decoded MIMO block diagram 100 in accordance with an embodiment of the present invention, wherein precoding of the artificial signal is performed prior to transmission of the artificial signal over the transmission channel. Wherein, {tilde over (x)} 105 is the actual information symbols to be transmitted to the MIMO receiver and ñ107 is the artificial signal generated b...

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Abstract

A system and method for increasing the capacity of a Multiple-Input Multiple-Output (MIMO) system at desired user's locations and reducing the capacity at locations, other than that of the desired user, while also providing secrecy. Knowing the channel coefficient between each transmitter and receiver antenna pair at the transmitter, the method of the present invention calculates the artificial signal that minimizes the Euclidean distance between the desired and received data symbols if the precoding / combining matrix pair from the set that has the minimum Euclidean distance to the singular value decomposition (SVD) of the channel matrix is used for transmission and reception. The artificial signal may be fed to the precoder, instead of the actual desired data symbols, or may be transmitted directly to reduce computational complexity, power consumption and processing delay if the hardware configuration allows.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Patent Application No. 62 / 682,421 filed on Jun. 8, 2018, entitled “Using Artificial Noise to Maximize Capacity and Secrecy of MIMO Transmitters that Use Analog / Hybrid / Codebook Based Digital Precoders”, which is incorporated by reference herein in its entirety.FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]This invention was made with Government support under Grant No. 1609581 awarded by the National Science Foundation. The government has certain rights in the invention.BACKGROUND OF THE INVENTION[0003]In a theoretical, ideal, Multiple-Input Multiple-Output (MIMO) antenna system, comprising multiple transmitting antenna at a transmitter and multiple receiving antenna at a receiver, after learning the channel matrix H between the transmitter and the receiver, the transmitter decomposes the channel matrix to its singular values:H=UΛV* [0004]Where the ith row and jth column of H contains ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B7/0456H04B7/0417H04L25/02H04L1/00
CPCH04L1/0042H04L25/0204H04B7/0626H04B7/0417H04B7/046H04B7/0478H04L25/0224
Inventor PEKOZ, BERKERHAFEZ, MOHAMMEDKOSE, SELCUKARSLAN, HUSEYIN
Owner UNIV OF SOUTH FLORIDA
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