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

fYear

2014

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Networks and Telecommuncations Systems (ANTS), 2014 IEEE International Conference on

Print_ISBN

978-1-4799-5867-2

Type

conf

DOI

10.1109/ANTS.2014.7057260

Filename

7057260