An adaptive MIMO transmission technique for LDPC coded OFDM cellular systems

Author

Kim, Kwang Soon ; Kim, Yun Hee ; Ahn, Jae Young

Author_Institution

Electron. & Telecommun. Res. Inst., Daejeon, South Korea

Volume

2

fYear

2004

fDate

17-19 May 2004

Firstpage

761

Abstract

An adaptive MIMO transmission scheme using QAM and LDPC code is proposed for an OFDM cellular system employing FDD. By approximating the LLR distribution to a Gaussian distribution, only two parameters, the mean and the normalized standard deviation, are required to be sent to the transmitter, which requires only a few more bits than those required in currently used single carrier cellular systems, such as cdma2000-1x EV-DO. It is shown by computer simulation that the proposed adaptive transmission scheme can provide up to 2∼3 dB gain over the conventional system using the mean SNR only, at the expense of only 3 more bits in the feedback information.

Keywords

Gaussian distribution; MIMO systems; OFDM modulation; adaptive codes; adaptive modulation; adaptive signal processing; cellular radio; parity check codes; quadrature amplitude modulation; 2 to 3 dB; FDD; Gaussian distribution; LDPC coded OFDM cellular systems; LLR distribution; QAM; adaptive MIMO transmission technique; adaptive coding; adaptive modulation; frequency division duplexing; low density parity check code; mean SNR; received log-likelihood ratio distribution; Adaptive systems; Computer simulation; Feedback; Gain; Gaussian distribution; MIMO; OFDM; Parity check codes; Quadrature amplitude modulation; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th

ISSN

1550-2252

Print_ISBN

0-7803-8255-2

Type

conf

DOI

10.1109/VETECS.2004.1388931

Filename

1388931