Title :
A variable rate multi-user CI/GO-OFDMA scheme over frequency selective channel
Author :
Mukati, Vijay ; Khan, Abdul Rauf ; Reddy, B. Veerender ; Kumar, Preetam
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol. Patna, Patna, India
Abstract :
In this paper, we present Carrier Interferometry (CI) spread OFDMA system with orthogonal subcarrier grouping (CI/GO-OFDMA) to support variable rate user classes. This work highlights the application of CI codes which can be generated for any integer to ensure efficient multicarrier variable rate transmission scheme. Simulation results obtained over pedestrian channel clearly shows that BER performance of CI based GO-OFDMA scheme significantly outperforms VSL MC-CDMA variable rate scheme for four different data rate users. CI codes with GO-OFDMA also ensures low peak to average power ratio (PAPR) and at the same time comparable complexity compared to VSL MC-CDMA. Further Pseudo Orthogonal Carrier Interferometry (PO-CI) codes can be used to support additional users/data rates which increases the spectral efficiency.
Keywords :
OFDM modulation; error statistics; frequency division multiple access; multiuser channels; wireless channels; BER performance; CI codes; PAPR; VSL MC-CDMA variable rate scheme; carrier interferometry; data rate users; frequency selective channel; multiuser CI/GO-OFDMA scheme; orthogonal subcarrier grouping; peak to average power ratio; pseudoorthogonal carrier interferometry codes; variable spreading length; Bit error rate; Interferometry; Load modeling; Multicarrier code division multiple access; Peak to average power ratio; OFDMA; Variable Rate Multi-User Communications;
Conference_Titel :
Advanced Networks and Telecommuncations Systems (ANTS), 2014 IEEE International Conference on
Print_ISBN :
978-1-4799-5867-2
DOI :
10.1109/ANTS.2014.7057260
