Multi User Interference Reduction And Throughput Enhancement In Ofdm Based Multicarrier Communication Systems

Download or read book Multi-user Interference Reduction and Throughput Enhancement in OFDM-based Multicarrier Communication Systems written by Kyoungnam Seo and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: (MMSE) multi-user detector and transmit power control, which results in an enhanced signal-to-noise ratio (SNR) and reduced transmit power consumption. In PLC systems, OFDM is combined with a bit-loading algorithm to increase throughput. Since the number of bits to carry at each sub-carrier is assigned by the SNR level, the throughput of the system is directly affected by impulsive noise. Our study focuses on the detection and mitigation of impulsive noise in PLC networks. We propose a time domain impulsive noise mitigation algorithm. This two-step iterative algorithm improves the data rate by up to 15 percent with a small addition of one OFDM block size memory. Finally, we consider SS-MC-MA systems that take advantage of DMT's adaptive bit-loading technique and CDMA's multi-user channel access. To further increase the throughput, we propose a dynamic sub-carrier allocation algorithm in SS-MC-MA-based PLC systems. Systems with the proposed algorithm show the average throughput increase up to 20 percent comparing to the conventional DMT systems and 10 percent comparing to the existing SS-MC-MA-based PLC systems.