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http://dx.doi.org/10.1109/JCN.2013.000004

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)
Publication Information
Journal of Communications and Networks / v.15, no.1, 2013 , pp. 8-14 More about this Journal
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.
Keywords
Cellular system; code division multiple access (CDMA); frequency reuse; orthogonal frequency division multiplexing (OFDM);
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