Intersymbol interference cancellation for layered demodulation with bit separated coding

Abstract

Very high transmission rates are required for current mobile communication systems, and it is anticipated that even higher transmission rates will be required in the near future. In order to satisfy these requirements, efficiency in the use of scarce frequency resources is essential. To this end, we further examine adaptive modulation which is a very good method to improve transmission efficacy over fluctuating channel conditions. Thus far, proposals that either incorporate or introduce the use of adaptive modulation require the negotiation of the modulation or coding scheme for use between the transmitter and the receiver. This negotiation results in a large overhead and requires very high transmission channel quality. In order to eliminate the need for this negotiation, we proposed a layered demodulation scheme with bit separated coding (see Uesugi, M. et al., WPMC'00-1165, 2000) that we believe provides a very effective solution to this end. This paper shows an intersymbol interference rejecting scheme which uses bit separated coding. The effect of the coding is that the performance of interference cancellation has been tremendously improved.