Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Combination of CS-CDMA and OFDM for Enhanced LTE on Downlink Channel

  • Jiao, Bingli (School of Electronics Engineering and Computer Science, Peking University) ;
  • Ma, Meng (School of Electronics Engineering and Computer Science, Peking University) ;
  • Lee, William C.Y. (School of Electronics Engineering and Computer Science, Peking University)
  • Received : 2012.02.01
  • Accepted : 2012.05.04
  • Published : 2013.02.28
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Abstract

For alleviating the low spectrum efficiency problem of orthogonal frequency division multiplexing (OFDM), due to the strong inter-cell-interference (ICI) at cell's edge, we introduce comb-spectrum code division multiple access (CS-CDMA) into broadband OFDM system at downlink channel for enabling the use of entire spectrum for seamless coverage. In addition, we develop a new method, called orthogonal cell code (OCC) scheme, to assist CS-CDMA for nullifying the ICI from contiguous cells. In system operation, each of the conventional cells is divided into an outer cell and an inner cell, and a mobile station (MS) should access to the CS-CDMA when it is in the outer cell and access to OFDM when it is in the inner cell. This study investigates the spectrum efficiency of using CS-CDMA and makes a comparison with that of long term evolution (LTE) in the following cases; (1) under an assumption of perfect channel state information and (2) based on channel estimates at a MS station. The results show the great advantage of utilizing the proposed system.

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