The Journal of the Korea Contents Association (한국콘텐츠학회논문지)

The Korea Contents Association (한국콘텐츠학회)
권호 표지
DOI QR코드

DOI QR Code

Performance of Wavelet Packet Multicarrier Modulation Systems with Narrowband Interference

웨이블릿 패킷 다중반송파 변조 시스템의 협대역 간섭에 대한 성능

  • Published : 2008.04.28
Download PDF
⟨ Previous Next ⟩

Abstract

These days, orthogonal frequency division multiplexing (OFDM) transmission method is widely used for broadband communication systems. The OFDM, which uses sine waves as orthogonal basis functions, is one of the orthogonal waveform modulation techniques. In this paper, we investigate a wavelet packet modulation method which uses wavelet packets instead of sine waves as the basis functions. The wavelet packets may have different patterns in two dimensional time-frequency domain, and we can design the packets appropriate for the channel environments with much flexibility. In this paper, we investigate the characteristics of the wavelet packet modulation as one of the multicarrier modulation methods, And we illustrate by simulations that narrowband interference can be reduced effectively by control the bandwidth of the wavelet packets.

현재 많은 광대역 전송 시스템의 변복조 방식으로 직교 주파수 분할 다중화(orthogonal frequency division multiplexing: OFDM) 방식이 널리 사용되고 있다. OFDM 방식은 기저파형으로 서로 직교하는 정현파를 사용하는 직교 파형 변조의 하나이다. 이 논문에서는 기저파형으로 정현파 대신 웨이블릿 패킷을 사용하는 웨이블릿 패킷 변조에 대해 살펴보고자 한다. 웨이블릿 패킷은 시간-주파수 2차원 평면에서 서로 다른 모양을 가질 수 있기 때문에 채널환경에 따라 그에 적합한 파형을 쉽게 설계할 수 있다. 이 논문에서는 다중반송파 변조방식의 다른 형태로서 웨이블릿 패킷 변조의 특징에 대해 살펴보고, 협대역 간섭 환경에서 대역폭을 유연하게 조절함으로써 간섭의 영향을 감소시킬 수 있음을 보이고자 한다.

Keywords

References

  1. L. J. Cimini Jr, "Analysis and Simulation of A Digital Mobile Channel Using Orthogonal Frequency-Division Multiplexing," IEEE Trans. Commun., Vol. COM-33, No.7, pp.665-675, 1985(7). https://doi.org/10.1109/TCOM.1985.1096357
  2. H. Sari, G. Karam, and I. Jeanclaude, "Transmission Techniques for Digital Terrestrial TV Broadcasting," IEEE Commun. Magazine, pp.100-109, 1995(2). https://doi.org/10.1109/35.350382
  3. A. Jamin, P. Mahonen, "Wavelet Packet Modulation for Wireless Communications," Wireless Communications & Mobile Computing Journal, Vol.5, issue 2, pp.1-18, 2005(3). https://doi.org/10.1002/wcm.287
  4. A. R. Lindsey, "Wavelet Packet Modulation for Orthogonally Multiplexed Communication," IEEE Trans. on Signal Processing, Vol.45, No.5, pp.1336-1339, 1997(5). https://doi.org/10.1109/78.575704
  5. K. M. Wong, J. Wu, T.N. Davidson, and Q. Jin, "Wavelet Packet Division Multiplexing and Wavelet Packet Design Under Timing Error Effects," IEEE Trans, on Signal Processing, Vol.45, No.12, pp.2877-2890, 1997(12). https://doi.org/10.1109/78.650245
  6. G. W. Wornell, "Emerging Applications of Multirate Signal Processing and Wavelets in Digital Communications," IEEE Proc. Vol.84, No.4, pp.586-603, 1996(4). https://doi.org/10.1109/5.488701
  7. J. M. Llorca, W. S. Lu, and V. K. Bhargava, "An Improved Wavelet-Packet-Division Multiple Access System," Communications, Computers and Signal Processing, 1999 IEEE Pacific Rim Conference on, pp.495-498, 1999(8). https://doi.org/10.1109/PACRIM.1999.799584