Title :
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
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;
Conference_Titel :
Signal Processing, Communication, Computing and Networking Technologies (ICSCCN), 2011 International Conference on
Conference_Location :
Thuckafay
Print_ISBN :
978-1-61284-654-5
DOI :
10.1109/ICSCCN.2011.6024563
