Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
권호 표지

Frequency Diversity of BICM-OFDM with Extended Interleaving

확장된 인터리빙을 사용하는 BICM-OFDM의 주파수 다이버시티

  • 최민철 (홍익대학교 전자정보통신공학과) ;
  • 김창중 (홍익대학교 전자정보통신공학과) ;
  • 이호경 (홍익대학교 전자전기공학부)
  • Received : 2010.05.17
  • Accepted : 2010.07.14
  • Published : 2010.07.25
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, we analyse the frequency diversity of BICM-OFDM with extended interleaving. The extended interleaving is an interleaving which is added to the existing BICM-OFDM system to extends the interleaving depth by times to the previous interleaving depth. Using the extended interleaving, the diversity order of the proposed system over -tap frequency selective channels is increased from min($d_{free}$, L) to min($d_{free}$, KL), where $d_{free}$ is minimum Hamming distance of the convolutional code. Simulation is also performed to show that the performance of the proposed system is better than that of the existing system even if the channel is an on-off channel in which the number of multi-paths is varying.

본 논문에서는 확장된 인터리빙이 추가된 BICM-OFDM 시스템의 주파수 다이버시티를 분석한다. 확장된 인터리빙이란 기존의 인터리빙 방법에서 인터리빙의 범위(depth)를 K배 확장한 것을 의미한다. 확장된 인터리빙을 사용하면 L개의 다중경로를 갖는 채널에서 다이버시티 효과를 min($d_{free}$, L)에서 min($d_{free}$, KL)로 증가 시킬 수 있다. 여기서 $d_{free}$는 길쌈 부호의 자유거리이다. 또한 이를 다중경로의 개수가 변하는 개폐 채널(on-off channel)에 적용하고 모의실험을 통하여 성능이 개선됨을 보인다.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. T.S.Rappaport, Wireless communication, 2nd ed., PHPTR, 2002.
  2. E.Akay and E.Ayanoglu, "Full frequency diversity codes for single input single output systems," in IEEE VTC Fall '04, LA, USA, September 2004.
  3. Min Cheol Choi, Chang-Joong Kim, Ho-Kyoung Lee, "Interleaving method for improved frequency diversity over on-off channel", JCCI, 2010.
  4. D.W.Matolak, I.Sen and W.Xiong, "Channel modeling for V2V communications,"(invited paper) Proc. 2nd International Workshop. Vehicle-to-Vehicle Communications 2006, San Jose, CA 21 July 2006.
  5. D.W.Matolak, "Channel modeling for vehicle-to-vehicle communications," IEEE Comm. Magazin, May 2008.
  6. I.Sen, D.W.Matolak, "Vehicle-vehicle channel models for the 5GHz band,", IEEE Trans. ITS, Vol.9, No.2, June 2008.
  7. G. Strang, Introduction to linear algebra, 3rd ed., Wellesley-Cambridge Press, 2003.