An On/Off Power Control for OFDM Transmission Scheme in a Cochannel Interference Environment

동일 채널 간섭 환경에서 OFDM 전송 방식을 위한 온/오프 송신 전력 제어

  • 박진규 ((주)솔리테크) ;
  • 임창헌 (부경대학교 전자컴퓨터정보통신공학부)
  • Published : 2007.10.31

Abstract

Frequency reuse in a cellular wireless communication environment gives rise to a phenomenon of cochannel interference. This paper introduces a power control strategy for OFDM based communication systems operating in such an environment. Among the existing power control schemes, IWF(iterative waterfilling) is known to exhibit relatively good performance. However, it requires feedback of power level and bit allocation information for each subcarrier from a receiver to its associated transmitter, which can lead to a considerable overhead, especially for the case of employing large number of subcarriers. Motivated by this, we present a simplified power control scheme with reduced overhead feedback, which allocates some nonzero identical power to the subcarriers of which channel conditions are above a certain threshold and zero power to the other ones. Computer simulations show that the proposed strategy produces a good approximation to the performance of the IWF in terms of the transmission power level while it requires less overhead feedback.

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