Binary Input MC-CDMA 전송방식의 대역효율증대방안 및 성능분석

The Bandwidth Efficiency Increasing Method and Performance Evaluation of Binary Input MC-CDMA

  • 오정열 (전북대학교 전자정보공학부) ;
  • 임명섭 (전북대학교 전자정보공학부)
  • 발행 : 1999.06.01

초록

한정된 무선자원에서 CDMA 방식의 초고속 이동멀티미디어 통신서비스를 제공하기 위해서는 대역사용효율을 높힐 수 있는 방안이 필요하다. 본 논문에서는 실수 이진 데이터가 입력되는 Binary input Multi Carrier-CDMA전송구조의 IFFT처리부에서 출력 심볼 파형이 대칭성을 갖는 점을 이용하여 중복된 출력 심볼파형의 1/2만을 본래 출력 심볼파형의 시간폭에 맞게 시간 확장을 하므로서 기존 전송대역폭의 1/2대역폭으로 신호전송이 가능한 구조를 제시하였다. 본 방식은 동일 대역폭 사용조건하에서 DS-CDMA방식에 비해 처리이득이 4배 높아지며 그에 따른 성능이 제시되었다.

It is necessary to devise the method for increasing bandwidth efficiency in order to provide the high speed mobile multi-media communication services with CDMA under the limited radio bandwidth resources. In this paper the structure for transmitting the high speed data at the half bandwidth of the required bandwidth using the symmetry property of the IFFT output of the binary input MC-CDMA, which enables the time scaling method utilized, is proposed. The processing gain is increased 4 times than the DS-CDMA and its performance is evaluated as better than DS-CDMA with rake receivers under the Rayleigh fading channel and same bandwidth per one channel.

키워드

참고문헌

  1. IEEE Communication Magazine v.28 no.5 Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come John A. C. Bingham
  2. Special Issue on MultiCarrier Modulation Jean-Paul Linnartz
  3. CDMA for Wireless Personal Communications Ramjee Rrasad
  4. IEEE Transactions on Communication Technology v.com-39 no.5 Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform S. B. Weinstein;Paul M. Ebert
  5. Proceedings ISSTA '96 An overview of multicarrier CDMA R. Prasad;S. Hara
  6. IEEE Transactions on Communication Technology v.com-33 no.7 Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing L. J. Cimini
  7. VTC '95 A model for performance evaluation in MQAM-OFDM schemes in presence of nonlinear distortions Giovanni Santella;Franco Mazzenga
  8. Digital Communications(3rd Edition) J. Proakis
  9. Mobile Communications Design Fundamentals(2nd Edition) William C. Y. Lee
  10. Proceedings of PIMRC'93 OFDM technique for digital television broadcasting to portable receivers D. Di Zenobio;G. Santella