Effective cross-layer satellite communications link interferences mitigation in the presence of various RFI types

Patent metadata

Field	Value
Publication number	US-10291347-B2
Application number	US-201715397640-A
Country	US
Kind code	B2
Filing date	Jan 3, 2017
Priority date	Jan 3, 2017
Publication date	May 14, 2019
Grant date	May 14, 2019

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 because of unintentional and intentional radio frequency interferences (RFIs). A unified SATCOM system spectrum efficiency and energy efficiency performance model 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 link optimizations providing traffic control, power control, frequency hopping pattern selection, beamforming codebook selection, and modulation with 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).

First claim

What is claimed is:

1. A systematic interferences mitigation system for satellite communications (SATCOM) network under interferences environment, comprising:
a receiver configured to:
perform a first-level SATCOM link modeling in conditions of both unintentional interferences and intentional interferences;
based on the first-level SATCOM link modeling, evaluate a modeled SATCOM link quality in the conditions of both the unintentional interferences and the intentional interferences;
optimize the evaluated SATCOM link quality and configure SATCOM link transmission parameters in the conditions of both the unintentional interferences and the intentional interferences;
perform a second-level SATCOM network modeling based on interactions between SATCOM nodes and opponents' nodes;
based on the second-level SATCOM network modeling, evaluate a modeled SATCOM network quality in the condition of both the unintentional interferences and the intentional interferences; and
optimize the evaluated SATCOM network quality and configure SATCOM nodes transmission parameters in the condition of both the unintentional interferences and the intentional interferences.

2. The system according to claim 1 , wherein:
in the first-level SATCOM link modeling, SATCOM link is modeled with unified interferences modeling considering both the unintentional interferences and the intentional interferences as:

y
m

=

E
r

⁢

h
m

(
TR
)

⁢

x
m

+

E
I

⁢

h
m

(
IR
)

⁢

k
m

+

z
m

+

n
m

,

m
=
1

,
2
,
…
⁢

,

L
s

where:
E r and E I are average received symbol energy from transmitter and from synchronized aggregated radio frequency interference (RFI) node respectively,
x m is m-th modulated symbol at the transmitter,
k m and z m are unknown synchronized interference and rest overall interference signal during a m-th symbol period,
L s is number of symbols in one frame,
y m , h m (TR) , h m (IR) , and n m are received sample, fading coefficient between the transmitter and the receiver, fading coefficient between the aggregated RFI node and receiver, and additive white Gaussian noise (AWGN), respectively; and
wherein z m is modeled as a Gaussian random variable with mean μ and variance 2α 2 ;
wherein assuming that the transmitter and the aggregated RFI node transmit each signal to the receiver using different paths, the path fadings of h m (TR) and h m (IR) are independently provided; and
wherein channel coefficient |h m (IR) | 2 ≥0 is modeled with general Nakagami fading distribution.

3. The system according to claim 1 , wherein:
a link quality of average outage expression for SATCOM employing frequency hopping is expressed as:

Φ
=

n

N
⁢

⁢

Γ
⁡

(

m
1

)

⁢

Γ
⁡

(

m
1

,

P
o

)

where m 1 is the aggregated interference,
Γ(⋅) is an incomplete gamma function,
P o is a cumulative signal-to-noise ratio obtained from link unified interferences modeling, and
n and N are interferences occupied channel number and SATCOM link transmission pair total available channel number, respectively; and
a final link quality of SATCOM link is a unified spectral/energy efficiency η SEE :
η SEE =η SE 1-λ /E t λ

where Φ is a satellite link system average outage; η SEE =(1−Φ)η o is satellite link spectral efficiency with Φ; and η o is satellite link spectrum efficiency in one transmission attempt;

1
Et

=

(

1
-
Φ

)

/

E
o

is satellite link energy efficiency with E o ; E o is a satellite link energy consumption in one transmission attempt; and λ is a weight that represents link performances preference of satisfying 0≤λ≤1.

4. The system according to claim 1 , wherein:
a transmission power of a SATCOM link is configured with a power selection lemma;
a data rate of a SATCOM link is configurated with a data rate selection lemma; and
a modulation and coding (MODCOD) pair of a SATCOM link is configured with an iterative algorithm,
wherein a different MODCOD pair is looped with input system parameters, and in each MODCOD loop, the data rate is firstly initialized as a maximum allowed value, with the data rate power selection lemma, the transmission power is calculated;
wherein after obtaining the transmission power, the data rate is updated with the data rate selection lemma,
wherein if the data rate converges, a system perform

Assignees

• Intelligent Fusion Tech Inc

Inventors

• Wang Gang
• Tian Xin
• Shu Zhihui
• Xiong Wenhao
• Nguyen Tien M
• Pham Khanh D
• Blasch Erik
• Shen Dan
• Wang Zhonghai
• Chen Genshe

Classifications

• Y02D70/168

  Cross-Sectional Technologies · mapped topic

• H04B2201/71323

  Adaptive systems · CPC title

• H04B1/715

  Interference-related aspects · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title

• H04B1/0028

  wherein the AD/DA conversion occurs at baseband stage · CPC title