EFFECTIVE CROSS-LAYER SATELLITE COMMUNICATIONS LINK INTERFERENCES MITIGATION IN THE PRESENCE OF VARIOUS RFI TYPES

• US 20180191457A1
• Filed: 01/03/2017
• Published: 07/05/2018
• Est. Priority Date: 01/03/2017
• Status: Active Application

• Current Assignee: Intelligent Fusion Technology, Inc.
• Original Assignee: Intelligent Fusion Technology, Inc.
• Granted Patent: US 10,291,347 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/0028 wherein the AD/DA conversion occurs at baseband stage
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 17/391 Modelling the propagation channel
• CPC Class Codes: H04B 2201/692 Cognitive radio
• CPC Class Codes: H04B 2201/71323 Adaptive systems
• CPC Class Codes: H04B 7/19 Earth-synchronous stations
• CPC Class Codes: H04K 3/25 based on characteristics of target signal or of transmission as countermeasure against surveillance H04K3/827, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A systematic interferences mitigation design for protected satellite communications (SATCOM) is provided. An advanced channel coding is designed to provide coding gain for SATCOM even in the presence of synchronization errors due to the effect of radio frequency interferences (RFIs). A unified SATCOM system spectrum efficiency and energy efficiency method is developed with a unified interference model for SATCOM dynamic resource allocation (DRA). The SATCOM system DRA is designed with a game theoretic engine and optimizations providing traffic control, power control, and modulation and coding agile waveform adaptations. The interferences mitigation design is implemented with software defined radio USRP and GNU-radio to maintain communication link quality of services (QoS).

Claims

1. A cross-layer design for anti-jamming scheme in a satellite communication (SATCOM) system, comprising:

various traffic packet support, processing, and control for audio, video, image, and text data transmission;

frame partitioning and formation for various traffic packets;

forward error correction to encode bits for unintentional and intentional interferences mitigation;

frequency hopping control for interferences avoidance;

beamforming control to transmit the signal in desired directions;

interference nulling to mitigate signals from undesired directions;

synchronizations of radio frequency signal for baseband signal transformation and processing;

performance measurement including frame error rate, system outage, spectrum efficiency, and energy efficiency;

SATCOM situation awareness including SINR estimation, traffic analysis and prediction;

interference model for system performance evaluation and planning;

game theoretic engine for interactive entities action selection, prediction and SATCOM radio resource management;

2. The method according to claim 1, wherein anti-jamming capability is obtained:

from the unified interference model, where both intentional interferences and unintentional interferences are considered and modeled;

from the interference model where synchronized interferences are modeled as an aggregated node undergoes general Nakagami fading channel;

from the interference model where unsynchronized interferences are modeled as AWGN with non-zero mean value.

3. The method according to claim 1, wherein anti-jamming capability is obtained:

from unified system spectrum efficiency and energy efficiency metric;

from the metric expression with various system parameters, including the length of information bit, data rate, power, modulation and channel coding sets, frequency hopping interference ratio, and channel fading;

from the metric expression with system outage and automatic repeat request (ARQ) protocol for frequency hopping system.

4. The method according to claim 1, wherein anti-jamming capability is obtained:

from two levels optimizations, including single side system optimizations and interactive entities social optimizations;

from the single side system optimizations including data rate control, power control, and MODCOD selection;

from the interactive entities game theoretic social optimizations including traffic control, MODCOD selection, frequency hopping pattern design, beamforming control, and interference nulling.

5. The method according to claim 4, wherein:

in the single side optimization process,

unified spectrum efficiency and energy efficiency is the optimization metric;

the transmission power is obtained from POWSEL;

the data rate control is obtained from DRSEL;

the joint MODCOD selection, data rate control, and power control is obtained from FIG. 4 shown flowchart.

6. The method according to claim 4, wherein:

in the game reasoning process,

SATCOM transmission pair and jammers are included;

multiple jammers are modeled as an aggregated intentional interference;

SATCOM transmission pair is one player;

aggregated intentional interference is another player.

7. The method according to claim 4, wherein information used in the game reasoning process is obtained:

from a space object propagator, providing a location and a speed of a current satellite in the SATCOM system;

from spectrum sensing, providing SINR estimation for all the carriers of the current satellite in the SATCOM system;

from situational awareness, providing jammers localization;

from traffic analysis, providing traffic prediction;

from SATCOM performance evaluations, providing frame error rate, unified spectrum efficiency and energy efficiency, and aggregated effective data rate.

8. The method according to claim 4, wherein game reasoning model is obtained:

with performance evaluation of frame error rate;

with aggregated effective data rate in all channels;

with frequency hopping incorporated;

with information uncertainty incorporated.

9. The method according to claim 1, wherein:

various traffic packets supported with audio, video, image, and text data;

various traffic packets are configured by game theoretic engine with packet length and packet data rate;

various traffic packets are formed as frames by frame partition with game theoretic engine configured MODCOD information.

10. The method according to claim 1, wherein:

forward error correction code includes an outer code and an inner code;

BCH and turbo codes serve as an outer code;

BCH is encoded and decoded with designed primitive polynomial vector depicted in FIG. 3;

LDPC codes serve as an inner code;

a switch to adapt BCH and turbo code based on the configured MODCOD information.

11. The method according to claim 1, wherein:

beamforming is formed for SATCOM signal transmission with game theoretic engine selected precoding matrix;

interference nulling is formed for SATCOM signal reception for multiple antennas system, which degrades to a notch filter for single antenna system.

12. The method according to claim 1, wherein the game reasoning process is implemented by,

the transmitter, the receiver, and multiple jammers, each including a Universal Software Radio Peripheral (USRP) configured with Gnu'"'"'s not Unix (GNU) Radio;

synchronization is performed with joint Costas loop, data-aided, and non-data-aided design.