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Table 1 Comparison with existing works

From: Secure massive MIMO system with two-way relay cooperative transmission in 6G networks

References

Category

Power allocation

Security strategy

Cooperative communication

Multiple-relay selection

Using duality

[16,17,18,19,20]

DT

✓

✓

 × 

 × 

 × 

[21]

OWR

✓

✓

✓

 × 

 × 

[22]

OWR

 × 

 × 

✓

 × 

 × 

[23]

OWR

✓

✓

✓

✓

 × 

[24]

OWR

✓

 × 

✓

 × 

 × 

[25,26,27]

OWR

✓

✓

✓

 × 

 × 

[28]

TWR

 × 

 × 

✓

 × 

 × 

[29]

TWR

✓

 × 

✓

 × 

 × 

[30]

TWR

✓

✓

✓

 × 

✓

[31]

TWR

 × 

✓

✓

 × 

 × 

[32, 33]

TWR

 × 

 × 

✓

 × 

✓

[37]

TWR

✓

 × 

✓

 × 

✓

Our work

TWR

✓

✓

✓

✓

✓

  1. DT Direct transmission; OWR one-way relaying; TWR two-way relaying