Flip Left-to-Right Approach Based Inverse Tree Interleavers for Unconventional Integrated OFDM-IDMA and SCFDMA-IDMA Systems

• Published in: Wireless personal communications 2019-04, Vol.105 (3), p.1009-1026
• Main Authors: Yadav, Manish, Shokeen, Vinod, Singhal, Pramod Kumar
• Format: Article
• Language: English
• Subjects: Bit error rate; Carrier frequencies; Code Division Multiple Access; Communications Engineering; Computer Communication Networks; Computer memory; Engineering; Frequency division multiple access; Interference; Networks; Orthogonal Frequency Division Multiplexing; Signal,Image and Speech Processing; Time Division Multiple Access
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-019-06133-3

Several interleavers have been proposed for conventional interleave division multiple access (CIDMA) systems which provides a mean to control burst errors and to reduce multi user and multiple access interferences. However, CIDMA alone is incapable of completely removing inter-symbol interference and inter-carrier interference problems even in presence of such interleaver. In this paper, a recently developed novel interleaver i.e. ‘flip left–right approach based inverse-tree interleaver’ (FLRITI) or simply ‘inverse tree interleaver’, has been explored for two unconventional integrated interleave division multiple access techniques i.e. single carrier frequency division multiple access cum interleave division multiple access (SCFDMA-IDMA) and orthogonal frequency division multiplexing based interleave division multiple access (OFDM-IDMA). The results and analysis reveal that this unconventional integration of CIDMA with SCFDMA and OFDM techniques in presence of FLRITI improves the overall system performance in terms of bit-error rate, memory footprint and computation complexity. Therefore, it validates the worthiness of FLRITI as a competent interleaver for the communication systems to be used even beyond fourth generation.