A novel subcarrier-power assignment scheme for OFDMA systems

Author

Lohar, Suprriya V. ; Khedkar, A.R.

Author_Institution

Dept. of Electron. & Telecommun., All Shri Shivaji Memorial Soc.´s Inst. of Inf. Technol., Pune, India

fYear

2011

fDate

21-22 July 2011

Firstpage

295

Lastpage

300

Abstract

This is subcarrier-power assignment scheme for various types of frequency-division multiple access (FDMA) systems such as SC-FDMA and OFDMA. Scheme is designed for uplink as well as downlink. This scheme has two parts, subcarrier assignment and power assignment. The subcarrier assignment is called as worst subcarrier avoiding (WSA) algorithm which is capable of avoiding allocating users the subcarriers with low channel qualities due to severe fading. WSA is low-complexity algorithm. The power-assignment is based on channel-inversion. Studies show that the attainable error performance of the FDMA systems used the WSA algorithm is the identical, irrespective of the multiplexing scheme used. Our simulation result shows that, bit error rate has reduced after implementing this scheme.

Keywords

OFDM modulation; fading channels; frequency division multiple access; multiplexing; OFDMA systems; SC-FDMA; WSA algorithm; channel-inversion; downlink; fading channels; frequency-division multiple access; low channel qualities; multiplexing scheme; power-assignment; subcarrier assignment; subcarrier-power assignment scheme; uplink; worst subcarrier avoiding; Complexity theory; Downlink; Frequency division multiaccess; Greedy algorithms; Resource management; Signal processing algorithms; Signal to noise ratio; OFDMA; channel inversion FDMA; power allocations; subcarrier-allocation;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing, Communication, Computing and Networking Technologies (ICSCCN), 2011 International Conference on

Conference_Location

Thuckafay

Print_ISBN

978-1-61284-654-5

Type

conf

DOI

10.1109/ICSCCN.2011.6024563

Filename

6024563