ĐA
̣
I HO
̣
C QUÔ
́
C GIA HA
̀
NÔ
̣
I
TRƯƠ
̀
NG ĐA
̣
I HO
̣
C CÔNG NGHÊ
̣
LƯU VĂN HOAN


H Ni - 2011

-OFDM












































   

-OFDM






 i




 ii
T iii
 iv






vi




 viii
 ix
 x

CHƯƠNG 1: GIƠ
́
I THIÊ
̣

́
NG MB-OFDM
2.1. 

-OFDM - 7 -
2.1.1. 

 - 7 -
2.1.2. 









 - 8 -
2.1.2.1. 

- 9 -
2.1.2.2.  10 -
2.2.  12 -
2.3. 






3.1. 













 35 -
3.2. 









 39 -
3.3.  47 -
3.4.  52 -

CHƯƠNG 4: KÊ

, 







 ,






  


TS Ngu






 , 





 


q-368 






 (WPAN), 


 UWB 


3100  10600 MHz, 












 528
MHz. 









1 trong 6 
. 











 1 





. 











 -








 (TFC) 
 y sang
 .


 -




.
 (CFO) 






 , 










 (ICI) 




.
III. 

T N C 

NG CH 






 (do CFO gây ra) 
2 

 .
IV. 

T  MÔ NG  

T 

N
K









 5 mô
 AWGN, CM1  CM4, c
, 





 (ICI) (


CFO, 

 ). 

 , 

















. 





 


, , 








(= 0.04 %) 






 

. 


, 



OFDM Based UWB Systems, 2006 IEEE Region 10
Technical Conference (IEEE TECON), 14-17 Nov. 2006,
HongKong, trang 1 - 4.

Studying the efffects of frequency offset on multiband orthogonal
frequency division multiplexing (MB-OFDM) systems

Luu Van Hoan

Electronics Engineering, Electronics and
Telecommunications Technology
Faculty of Electronics and Telecommunications

Dr Nguyen Thanh Hieu
Department of Wireless Communications, Faculty of
Electronics and Telecommunications
University of Engineering and Technology
Keywords – UWB, OFDM, MB-OFDM, Carrier Frequency Offset.

The MB-OFDM systems is standardised by
ECMA-368 standard for wireless personal area
networks (WPAN) operating at short ranges and
high data rates. The systems use all of or a part of
the UWB spectrum from 3100 MHz to 10600
MHz. At present, the system support data rates
upto 480 Mbps and so on.
I. INTRODUCTION

channel responses in different bands.
IV. SIMULATION RESULTS AND
CONCLUSION
With CFO, but not compensating, we can see that
as the CFO increases, the BER also increases.
The reason is that SNR at the receiver decreases,
because the signal after demodulation has ICI.
The performance of system is improved
significantly when CFO is compesnsated at
receiver. When CFO is so small, the accuracy of
the CFO estimation is not good.
REFERENCES
[1] W. Pam Siriwongpairat, K. J. Ray Liu, Ultra-Wideband
Communications Systems - Multiband OFDM Approach,
John Wiley & Sons, Inc, 2008.
[2] Paul H. Moose, A Technique for Orthogonal Frequency
Division Multiplexing Frequency Offset Correction, IEEE
Transactions on Communications, Vol. 42, No. 10, October
1994, pages 2908  2914.
[3] Timothy M. Schmidl, Donald C. Cox, Robust
Frequency and Timing Synchronization for OFDM, IEEE
Transactions on Communications, Vol. 45, No. 12,
December 1997, pages 1613  1621.
[4] Chin Wee Yak, Zhongding Lei, Tjeng Thiang Tjhung,
Maximum likelihood frequency offset estimation and
Cramer Rao bound for ultra-wideband (UWB) multi-
band OFDM systems, IEEE Vehicular Technology
Conference, VTC 2006 Spring, 7-10 May 2006, pages 1929
 1934.
[5] B. D. Sahu, Debarati Sen, R. V. Raja Kumar and Saswat