Study on outage performance gap of two destinations on CR-NOMA network

TELKOMNIKA Telecommunication, Computing, Electronics and Control
Vol. 18, No. 1, February 2020, pp. 191~198
ISSN: 1693-6930, accredited First Grade by Kemenristekdikti, Decree No: 21/E/KPT/2018
DOI: 10.12928/TELKOMNIKA.v18i1.13271  191
Journal homepage: http://journal.uad.ac.id/index.php/TELKOMNIKA
Study on outage performance gap of two destinations on
CR-NOMA network
Hong-Nhu Nguyen1
, Chi-Bao Le2
, Nhat-Tien Nguyen3
, Dinh-Thuan Do4
1,3
Faculty of Electronics and Telecommunications, Saigon University, Ho Chi Minh City, Vietnam
2,4
Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City, Vietnam
Article Info ABSTRACT
Article history:
Received Jun 2, 2019
Revised Nov 11, 2019
Accepted Nov 30, 2019
Non-orthogonal multiple access (NOMA) and cognitive radio (CR) are
promising to overcome spectral scarcity problem encountered in applications
implementations in wireless communication. Especially, massive
connectivity in such network is strict requirement in network deployment.
This study aims to improve spectral efficiency at two secondary destinations
by investigating a CR-NOMA network under situation of the perfect
successive interference cancellation (SIC). We also derive the exact outage
probability for secondary users. Furthermore, an approximate computation
method is applied to indicate more insights. It is confirmed that
the performance achieved together with performance gap among two users
can be obtained due to different power allocation factors assigned to users.
Keywords:
Cognitive radio
Non-orthogonal multiple access
SIC
This is an open access article under the CC BY-SA license.
Corresponding Author:
Dinh-Thuan Do,
Faculty of Electronics Technology,
Industrial University of Ho Chi Minh City (IUH),
Ho Chi Minh City, Vietnam.
Email: dodinhthuan@iuh.edu.vn
1. INTRODUCTION
The spectral efficient and energy-efficient requirements are necessary to satisfy the explosive
increase of mobile user in wireless system with high-rate services. However, high spectral efficiency (SE)
cannot be achieved since the fixed spectrum allocation strategy is adopted. Unfortunately, 30 percentages of
the licensed spectrum in the United States is fully occupied as the report from the Federal Communications
Commission [1]. By allowing the primary network to share its frequency band with the secondary network,
cognitive radio (CR) has been studied and hence SE improvement achieved [2]. In principle of CR, spectrum
sharing paradigm permits the secondary users (SUs) to operate together with the primary users (PUs) at the
same band and power constraint must be obeyed to limit interference impact caused by the PUs [3, 4].
Several techniques such as cellular networks, relay networks, and wireless sensor networks, benefit from
implementation of CR to provide the potential SE improvement.
To further provide massive connectivity, more advantages can be achieved by employing multiple
access for mobile users. In particular, the network allocates resource to users by dividing the total radio
resources with two underlying techniques, i.e. orthogonal multiple access (OMA) and non-orthogonal
multiple access (NOMA). The interference can be eliminated in OMA scheme while NOMA employs
successive interference cancellation (SIC) technique to alleviate interference from other users’ signal [5]. By
exploiting the users’ channel asymmetry, NOMA can remarkably enhance the SE and then the transmission
latency can be reduced [5-8]. The authors in [9] showed that the achievable rate region in the uplink NOMA
is improved in comparison with OMA and such analysis is adopted in wireless powered communication

 ISSN: 1693-6930
TELKOMNIKA Telecommun Comput El Control, Vol. 18, No. 1, February 2020: 191 - 198
192
(WPC) networks. In [10], main results reported that NOMA with advantage of improved user fairness and it
provide more benefits compared to OMA. It is further proved that NOMA performs better than OMA in both
downlink and uplink by achieving the problem of joint maximization of the downlink/uplink rates while
taking fairness between users is satisfied [11]. In [12], the authors presented energy efficiency in wireless
powered NOMA networks and system performance is evaluated. In addition, recent works [13-22]
considered advantage of NOMA to implement in emerging networks. In particular, this paper develops
system based on results in [23-25]. More specifically, in this paper, we formulate the received signal at the
secondary user (SU) which can extract the data signal by using SINR or SNR. The outage probability (OP) of
the SU are analyzed in details in terms of probability of SINR and SNR. The results show that CR-NOMA
provide fairness to two users in term of OP.
2. SYSTEM MODEL
We assume that the system model with a downlink dual-hop underlay cognitive
radio–non-orthogonal multiple access (CR-NOMA) network shown in Figure 1, in which there are a primary
destination (PD) who is located in primary network (PN), a secondary source (BS), a relay (R) operating in
half-duplex mode and two destination users (U1; U2). The wireless channels follow Rayleigh fading-channel
𝑢 with channel gain 𝛺 𝑢. These channels assigned as in Figure 1 are h0, h1, g1 and g2, are independent and
identically distributed (i.i.d.) zero-mean complex Gaussian random variables (RVs). Single antenna is
assumed at each node. In this scenario, a perfect channel state information (CSI) is adopted.
As Figure 1, the distances between nodes are denoted by h0, h1, g1 and g2. In CR-NOMA, the BS make
interference to PD. It is noted that R requires decode-and-forward (DF) mode to forward signal to far users.
It is assumed that R is placed very far from the transmit primary source PD and hence it cannot interfere with
the primary network as shown in Figure 1. The power constraint for operations of both primary network and
secondary network is considered in this context.
BS
U2
g1 U1
g2
Secondary link
Interference link
R
PD
h1
h0
Secondary
network
Primary network
Figure 1. NOMA in cognitive radio network
The transmit power at secondary source is set based on constraint as above consideration
𝑃𝐵𝑆 ≤ 𝑚𝑖𝑛 (
𝐼
|ℎ0|2 , 𝑃̄ 𝐵𝑆) (1)
where 𝑃̄ 𝐵𝑆 and 𝐼 is denoted as the maximum average transmit power available at 𝐵𝑆 and interference
temperature constraint (ITC) at 𝑃𝐷, respectively. We call 𝑎1, 𝑎2as power allocation factors. In the first time
slot, R received the following signal
𝑦 𝑅( 𝑘) = ℎ1[√ 𝑃𝐵𝑆 𝑎1 𝑠1( 𝑘) + √ 𝑃𝐵𝑆 𝑎2 𝑠2( 𝑘)] + 𝑛 𝑅( 𝑘) (2)
where ℎ0~𝒞𝒩(0, 𝛺ℎ0), ℎ1~𝒞𝒩(0, 𝛺ℎ1), 𝑛 𝑅~𝒞𝒩(0, 𝜎 𝑅
2), it is assumed that 𝑎1 > 𝑎2nd 𝑎1 + 𝑎2 = 1.
By using NOMA, to detect signal s2 R decodes and removes s1 from the received signal. Therefore,
it need be determined the signal-to-interference-plus noise ratio (SINR) and signal-to-noise ratio (SNR) to
detect s1 and s2 at R as follows
𝛾 𝑅,𝑠1
=
𝜌 𝐵𝑆 𝑎1|ℎ1|2
𝜌 𝐵𝑆 𝑎2|ℎ1|2+1
(3)

TELKOMNIKA Telecommun Comput El Control 
Study on outage performance gap of two destinations on CR-NOMA network (Hong-Nhu Nguyen)
193
where 𝜌 𝐵𝑆 =
𝑃 𝐵𝑆
𝜎 𝑅
2
𝛾 𝑅,𝑠2
= 𝜌 𝐵𝑆 𝑎2|ℎ1|2
(4)
Then, within the second slot, R forwards the detected superimposed signal
√ 𝑃𝑅 𝑎1 𝑠̃1( 𝑘) + √ 𝑃𝑅 𝑎2 𝑠̃2( 𝑘), where PR is the transmitted power at R, 𝑠̃1( 𝑘)and 𝑠̃2( 𝑘)are the detected and
forwarded data to the respective receivers. Therefore, Ui receives the following signal:
𝑦 𝑅𝑈 𝑖
( 𝑘) = 𝑔𝑖[√ 𝑃𝑅 𝑎1 𝑠̃1( 𝑘) + √ 𝑃𝑅 𝑎2 𝑠̃2( 𝑘)] + 𝑛 𝑅𝑈 𝑖
( 𝑘) (5)
where 𝑖 ∈ {1,2}, 𝑔𝑖~𝒞𝒩(0, 𝛺 𝑔𝑖) and 𝑛 𝑅~𝒞𝒩(0, 𝜎 𝑅𝐷 𝑖
2
). Furthermore, U2 implements SIC by detecting
𝑠̃1( 𝑘)while considering its own data 𝑠̃2( 𝑘)as a noise. The SINR of which can be written as:
𝛾 𝑅𝑈2,𝑠1
=
𝜌 𝑅 𝑎1|𝑔2|2
𝜌 𝑅 𝑎2|𝑔2|2+1
(6)
where 𝜌 𝑅 =
𝑃 𝑅
𝜎 𝑅𝐷 𝑖
2 . Then, by alleviate interference existing in (6) it can be detected the remaining signal.
Therefore, to detects its own signal at U2 , SNR is given by
= 𝜌 𝑅 𝑎2|𝑔2|2
(7)
It is worth noting that U1 is allocated with higher power factor, s1 has higher priority to detect compared with
remaining signal, then SINR is expressed by
=
𝜌 𝑅 𝑎1|𝑔1|2
𝜌 𝑅 𝑎2|𝑔1|2+1
(8)
3. PERFORMANCE ANALYSIS AND NUMERICAL RESULTS
3.1. Outage probability analysis at user 1
In this section, we examine the outage probability (OP) for s1 and s2. In [10-13], the OP of a signal is
defined as the probability that the achievable rate is below than a predefined rate threshold 𝑅𝑡ℎ𝑟, i.e.,
𝑃 𝑈1 = 𝑃𝑅[ 𝑅1 < 𝑅𝑡ℎ𝑟]. Therefore, the OP of s1 can be derived as:
( )( ) ( )1 1 1 1 1 1 1
1
, , 1 , 1 , 1
2 2
1 1 1 1
1 12 2 2
2 1 2 1 0
2 2
1 1 1 1
1 12 2 2 2
2 1 0 2 1 0
Pr min , 1 Pr ,
1 Pr , ,
1 1
Pr , ,
1
U R s RU s R s RU s
BS R I
BS
BS R
A
I R I
BS
I R
a h a g
a h a g h
a h a g
a h h a g h
      
  
  
 
  
  
 
=  = −  

  
  = −   
  + + 


+   
+ +
2A


 
 


(9)
where 𝜌𝐼 =
𝐼
𝜎 𝑃 𝐷
2 and 𝛾1 = 22𝑅1 − 1 is SNR related to interference and SNR related to target rate 𝑅1of user 𝑈1
respectively. Based on distribution functions of wireless channels, it can be expressed as:
( ) ( ) ( )2 2 2
1 1 0
1 1 0
2 2 2
1 1 1 0
0
Pr , ,
1
I
BS
BS R
I
BS h R g BS h
I
h g h
BS R BS
A h g h f x dx f y dy f z dz
e e


 
 
  
  
 
  
 
− − −
  
 
=    = 
 
 
=  − 
 
 
  
(10)

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194
where 𝜓 =
𝛾1
(𝑎1−𝛾1 𝑎2)
. In similar way, it can be computed the second part of (9) as:
( ) ( ) ( )2 2 2
1 10
1 0 1 10 1
2
2 2 20
2 1 1 0
11
1
1 0 1 0
Pr , ,
1 1
I
R IS
I
g BS h I h R gh I h
I
R BS
I
g hh
yI R BS
x
y
I h
g h I h h
h
A h g h f x dx f y f z dydz
e dx e dy e
  
 
  
  
 
 
 
  

 
  
   − − + −− +             
 
 =    =
 
 

= =
   + 
  
 
(11)
by replacing (9) by (10) and (11), (9) can be re-expressed as:
𝒫𝑈1
= 1 − [𝑒
−
𝜓
𝜌̄ 𝐵𝑆 𝛺ℎ1
−
𝜓
𝜌 𝑅 (1 − 𝑒
−
𝜌 𝐼
𝜌̄ 𝐵𝑆 𝛺ℎ0) +
𝜌 𝐼 𝛺ℎ1
𝜌 𝐼 𝛺ℎ1+𝜓𝛺ℎ0
𝑒
−
𝜌 𝐼
𝜌̄ 𝐵𝑆
(
1
𝛺ℎ0
+
𝜓
𝜌 𝐼 𝛺ℎ1
)−
𝜓
𝜌 𝑅 𝛺 𝑔1] (12)
it is noted that the above formula is correct when𝑎1 > 𝛾1 𝑎2.
3.2. Outage probability analysis if perfect SIC at user 2
Similar to the signal s1, at user 𝑈1, the OP of the signal s2 can be expressed as:
( )( ) ( )2 2 2 2 2 2 2
1
2
, , 2 , 2 , 2
2 2
2 1 2 2 2 2 2
0
2
22 1
2 2 2 22 2
0 0
Pr min , 1 Pr ,
1 Pr , ,
Pr , ,
pSIC
U R x RU x R x RU x
I
BS R BS
B
I I
R BS
B
a h a g
h
a h
a g
h h
      

    
 
   
=  = −  

  
  = −   
  
 


 
 +   
 
 


(13)
where 𝛾2 = 22𝑅2 − 1 with 𝑅2 corresponding target rate of 𝑈2. The first part and the second part of (13) can
be further computed by:
( ) ( ) ( )
2 2
1 2 2 2 0
2 2 2
1 2 0
2 2
2 2
2 2 22 2
1 1 2 0
2 2
0
Pr , ,
1
I
IBS
BS h R g BS h
BS R
I
BS R BS
a a
h g h
a a
B h g h
a a
f x dx f y dy f z dz e e

  
  
 
 
  
  
  − − −
  
 
=    
 
 
= =  − 
 
 
  
(14)
then, other term can be given as:
( ) ( ) ( )2 2 2
2 10
2 2
2 2
22
2 0 1 20 1 2
2
2
2
2 2 22 0 2
2 1 2 0
2 2
11
1 2
2 0 1 2 2 0
Pr , ,
1 1
I
R BS I
I
g BS h I hh I h
I
R BS
I
g hh
yI R BS
a a
x
y
aa I h
g h I h h
a
h
B h g h f x dx f y f z dydz
a a
a
e dx e dy e
a
  
  
 
 
 
 
  
  

 
  
   − − +− +          
 
 =    =
 
 

= =
   + 
  
 
2
2 2R g a


− 
(15)
by substituting (15) and (14) into (13), (13) can be rewritten as:

195
𝒫𝑈2
𝑝𝑆𝐼𝐶
= 1 − [𝑒
−
𝛾2
𝜌̄ 𝐵𝑆 𝛺ℎ1 𝑎2
−
𝛾2
𝜌 𝑅 𝛺 𝑔2 𝑎2 (1 − 𝑒
−
𝜌 𝐼
𝜌̄ 𝐵𝑆 𝛺ℎ0) +
𝜌𝐼 𝛺ℎ1 𝑎2
𝜌𝐼 𝛺ℎ1 𝑎2+𝛾2 𝛺ℎ0
𝑒
−
𝜌 𝐼
𝜌̄ 𝐵𝑆
(
1
𝛺ℎ0
+
𝛾2
𝜌 𝐼 𝛺ℎ1 𝑎2
)−
𝛾2
𝜌 𝑅 𝛺 𝑔2 𝑎2] (16)
3.3. Outage analysis if imperfect SIC at user 2
The SINR and signal-to-noise ratio (SNR) of decoding s2 at R and at destination 𝑈2 can be
respectively written as:
𝛾 𝑅,𝑠2
=
𝜌 𝐵𝑆 𝑎2|ℎ1|2
𝜌 𝐵𝑆|𝑓1|2+1
(17)
=
𝜌 𝑅 𝑎2|𝑔2|2
𝜌 𝑅|𝑓2|2+1
(18)
then, the OP in case of imperfect SIC at 𝑈2can be calculated by:
( )( )
( )
2 2 2 2
2 2 2
1
, , 2
, 2 , 2
2 2
2 1 2 2
2 22 2 2
1 2 0
2 2
2 1 2 2
2 22 2 2 2
1 0 2 0
Pr min ,
1 Pr ,
1 Pr , ,
1 1
Pr , ,
1
ipSIC
U R x RD x
R x RD x
BS R I
BS
BS R
C
I R I
BS
I R
a h a g
f f h
a h a g
f h f h
  
   
  
  
 
  
  
 
= 
= −  

  
  = −   
  + + 

 
 +   
 + + 
2C






(19)
similarly, (19) can be rewritten as:
( )
2 2
1 2 2 20
2
2 2
0 2 2 2
11
2 1 2 2
1 2 2 2
11
12 10 2
2 2 2 2 2 2
2 2
1 1 1 1
1 1
I
h BS R gBS h
I
BS h BS R g
a a f fipSIC
U
h g
a afh
f R R g R g
I
e e
a a
a a e
a a
 
 
  
  
 

   

−−
− −−
 
−−
− − −−  
     
= −  −  + +            
  
+ + +  +    
    
(20)
3.4. Asymptotic analysis
This part provides approximate performance as extra insights in our conisdered system.
When 𝜌 → ∞, it can be applied 𝑒−𝑥
≈ 1 − 𝑥, then approximate performance can be archived as below.
The approximate OP of user 𝑈1can be given by:
𝒫𝑎𝑠𝑦𝑚,𝑈1
∞
= 1 − [(1 −
𝜓
−
𝜓
𝜌 𝑅
)
𝜌 𝐼
+
𝜌 𝐼 𝛺ℎ1
𝜌 𝐼 𝛺ℎ1+𝜓𝛺ℎ0
(1 −
𝜌 𝐼
𝛺ℎ0 𝜌̄ 𝐵𝑆
−
𝜓𝜌 𝐼
𝜌 𝐼 𝜌̄ 𝐵𝑆 𝛺ℎ1
−
𝜓
𝜌 𝑅 𝛺 𝑔1
)] (21)
the approximate OP of user 𝑈2in case of perfect SIC can be given by:
2
, 2 2
,
1 2 2 2 0
1 2 2 2
1 2 2 0 0 1 2 2 2
1 1
1
pSIC I
asym U
BS h R g BS h
I h I I
I h h h BS I BS h R g
a a
a
a a a
  
  
    
     

 
= − − −     
 
+ − − −    +      
(22)

 ISSN: 1693-6930
196
the approximate OP of user 𝑈2in case of imperfect SIC can be formulated by:
( )
2
11
2 1 2 2, 2 2
,
0 1 2 2 2 1 2 2 2
11
12 10 2
2 2 2 2
2 2
2 2
2 2
0 2 2 2
1 1 1 1
1 1
1
f fipSIC I
asym U
BS h h BS R g h g
fh
f R R g
I
I
R g
BS h BS R g
a a a a
a
a a
a
a a
   
  

  

  

  
−−

−−
−
      
= − − − + +                
  
+ + +  +   
   
 
  − − −    



(23)
3.5. Throughput
In term of throughput, each user can be shown throughput performance as:
𝜏 𝑈⋆
= (1 − 𝒫 𝑈⋆
)𝑅⋆ (24)
where ⋆∈ {1,2}.
4. NUMERICAL RESULTS
In this section, we evaluate the performance of CR-NOMA, we set power allocation factors
𝑎1 = 0.8 and 𝑎2 = 0.2, the target rate is set to be 𝑅1 = 1 and 𝑅2 = 1.5, the channel gains 𝛺ℎ0 = 1, 𝛺ℎ1 = 1,
𝛺 𝑔1 = 1, 𝛺 𝑔2 = 0.4, 𝛺𝑓1 = 𝛺𝑓2 = 0.001. Interference between PN and SNR is 𝜌𝐼 = 40 𝑑𝐵. Figure 2 and
Figure 3 plot the OP of two secondary destinations, as varying interference level 𝜌𝐼 and power allocation
factor, transmit SNR. Outage performance of 𝑈1 is better than that of 𝑈2. It can be seen that when higher
transmit SNR is required, outage performance will be improved significantly at considered range of SNR and
OP meets saturation trend as SNR is from 50 (dB) to 60 (dB).
The asymptotic curves match with the analytical curves very well at high SNR. This output confirms
exact approximate expressions of outage probability archived for two users. It is intuitively seen that no ITC
case exhibits lowest performance since no harmful interference from the PN exists. It can be seen
performance gap of these cases with different data rate is small, it exhibit acceptance performance for such
NOMA with acceptable small value of target rate. In addition, Monte-Carlo simulation results match with
analytical results very well in whole range of SNR. Figure 4 proved that higher rate result in worst case of
outage performance. In addition, as observation from Figure 5, throughput is high at high SNR and high 𝜌𝐼.
Figure 2. Outage performance
versus SNR at secondary source
Figure 3. Impact of ITC on outage performance
versus SNR at secondary source

197
Figure 4. Outage performance versus target
rates,with 𝜌𝐼 = 20 ( 𝑑𝐵), 𝑎1 = 0.9and 𝑎2 = 0.1
Figure 5. Throughput performance
5. CONCLUSION
In this paper, CR-NOMA networks over Rayleigh fading channels is studied by exploring
the end-to-end closed-form expressions to indicate outage performance . To compare the outage performance
of two secondary destinations, we derived expressions of outage probability and then numerical results are
provided performance comparisons of two users in CR-NOMA network. As main result, the fairness of two
users is satisfied as in numerical results by the proper selection of power allocation factors. Other condition is
that interference to primary network can be constrained. Moreover, comparison results of the outage behavior
showed that 𝑈1 performs better than 𝑈2 in considered scenarios. Finally, in the future work, we will consider
multiple users who operate in manner of CR-NOMA network.
ACKNOWLEDGEMENTS
The authors would like to thank the anonymous reviews for the helpful comments and
suggestions.This work is a part of the basic science research program CS2019-42 funded by the Saigon
University. Correspondence should be addressed to Dinh-Thuan Do (dodinhthuan@iuh.edu.vn).
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