시스템에서 감소를 위한 기법의 성능개선에 관한 연구

시스템에서 감소를 위한

기법의 성능개선에 관한 연구

을 의

으로 함

Nomenclature

σ Δ δ

Δθ

σ α δ

Abbreviations

: : : : : : : : : : : :

:

: : : : : : : : : :

Abstract

_

_

^{  }_{ }



^{     ≦  ≦ }

_{≡ }

 ^

 ^

_≦ _   _^



_ _     _^

  

_ _

_  _













_{  }

^



_



_

 

_

  _ 

  

  _











^{ ≦  ≦ }

    _∧    _









 

_{  }

^



_



_

 

_

   

  _







 

^{ ≦  ≦ }

    _∧    _

    



_



_

   

   _



  

_



_

 

_

   

   _





  

_



_

 

_

 



_



_

  

  

  _  _{ }



_  _

_   _  _

_   _      _



_^{  }







_^     _ _

  _      _ _  







_^    _ _  

     _ _  _ _ 

   



  

_

   _ 

 _ 

_ _

   

 _{   ∞}



^{∞   }_{  }



^_



 _{ }^{  }   _

_{ } 

_   _ 

 _



_^{     }



_^{  }

   _ _

 ^{   }    _{ }

_{ }

_ __

   _

     _

  _

≃ _{  } _ _



_{ } _





_



  _

 ⋅^{  }

 _





_



  _

 



  

_{ }^{ }⋅^{  }

 



0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

0 2 4 6 8 10 12 14 16

Time

PAPR

 __{}

_





≧    ^

      ^

 

 







 

    

    ≦  ≦

    



_{ }





0 2 4 6 8 10 12 10^-6

10^-4 10^-2 10⁰

CCDF of Clipped O FDM signal

PAPRo

Pr(PAPR>PAPRo)

10^-1

10^-3

10^-5

_



^{ }



     _^

_

^{ }

_^{ }

_^∼

 ^{ }

_ _{ } ⋯ _



_{ }^{ } _{ }⋅_^{ } ≦ ≦  ≦ ≦

^{ }

^{ } _^{ } ⋯ _^{ }

_^{ }  _^{ }

_^{ }∈   ≦ ≦ ≦ ≦ 

 

_^{ }

_^∼

_^{ }



^ 



_^∼ _^

_

_



^{}



    _^ _ 

_

_

_



^{}



^{ }



^{}



^

    _^^

_

변조기 입력

데이터 직/병렬

변환

IFFT

IFFT

IFFT

P⁽¹⁾

A

^(m1)

A

^(m2)

A

^(ml)

P

⁽²⁾

P^(l)

A

^m 최저 PAPR

심볼 선택

a

^(m1)

a

^(m2)

a

^(ml)

a

^~m

_

맵핑 입력

데이터

직

/

병렬 변환

&

부블록 분할

병

/

직렬 변환

N-IFFT N-IFFT N-IFFT

가중요소 최적화

k k

k

b⁽m¹⁾

b⁽m²⁾

b⁽m^m)

a^m A^m

_ _{ } ⋯ _



__{  }



^{    ≦ ≦}

_^{ }  _^{ }

_^{ }∈  ≦ ≦

__{  }



^{  ⋅ }

_



^



_



  

^



_^{ }⋅_^



_{  }



^{  ⋅}

^

^

^

^_{  }



^{ ⋅}

_^



^





_^

_^

_^_^ 

_^_^





^{ ≦   }



  

^



_^⋅_{ }^



__{  }



^{ ⋅}







_^

A

⁽m¹⁾

M A

⁽m²⁾

M

A

⁽m³⁾

M

A⁽m¹⁾

M

A⁽m²⁾

M

A⁽m³⁾ 0 M

참 조 부 반 송 파 (unm odulated)

^_  

 



^      ⋯  



  __ ⋯_{  }^ 

_ 

 _{  }



^{ }



^      ⋯



^′_{  }



^{ }

±

^{ }

±

^{ }

맵핑 입력

데이터

직/병렬 변환

&

부블록 분할

X 병/직렬

변환

N-IFFT N-IFFT N-IFFT

가중요소 최적화

k k

k

b1

b2

bM

PAPR 연산

임계레벨 비교기

클리핑 Case 1

Case 2 Case 3

Case 1

Case 2

Case 3

저 임계레벨 고 임계레벨













 





0 2 4 6 8 10 12

1 2 3 4 5 6 7 8

Low threshold level [dB]

Computational complexity

Adaptive PTS(no clipping) clipping delta = 1 dB clipping delta = 2 dB clipping delta = 3 dB

0 2 4 6 8 10 12 0

20 40 60 80 100 120 140

Low threshold level [dB]

Computational complexity

Adaptive PTS(no clipping) Clipping delta = 1 dB Clipping delta = 2 dB Clipping delta = 3 dB

__



2 4 6 8 10 12 14 16 18 20 10^-4

10^-3 10^-2 10^-1

Eb/No [dB]

BER

Adaptive PTS (no clipping) clipping delta = 1 dB clipping delta = 2 dB clipping delta = 3 dB

10^-5

. , .

.

. ,

,

.

, , , .

, , ,

,

ㆍ

, ,

, .

DPS

最古

, , ,

, , , , ,

, , MMIC ,

. .

,

. ...

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