Efficient adaptive modulation and power allocation algorithm for OFDMA cellular systems

Author

Kim, Kwang Soon

Author_Institution

Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea

fYear

2005

fDate

April 28-30, 2005

Firstpage

169

Lastpage

173

Abstract

An adaptive transmission scheme using QAM and LDPC code is proposed for an OFDMA cellular system employing FDD. Also, adaptive algorithms for active user selection, subchannel transmission power allocation, and modulation and coding set selection are proposed. The performance of the proposed scheme is obtained from computer simulation and is compared with that of the conventional scheme using mean SNR only. It is shown that the proposed scheme can provide up to 5.1 dB gain over the conventional scheme at the expense of only 3 more bits in feedback information.

Keywords

OFDM modulation; adaptive codes; adaptive modulation; cellular radio; channel allocation; frequency division multiple access; modulation coding; parity check codes; FDD; LDPC code; OFDMA cellular system; QAM; active user selection; adaptive transmission scheme; frequency division duplexing; low-density parity check code; modulation coding set selection; quadrature amplitude modulation; subchannel transmission power allocation; Channel state information; Decoding; Feedback; Information technology; Modulation coding; OFDM modulation; Parity check codes; Power system modeling; Quality of service; Radio transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Telecommunications Symposium, 2005

Print_ISBN

0-7803-8856-9

Type

conf

DOI

10.1109/WTS.2005.1524783

Filename

1524783