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Conference Paper
An adaptive MIMO transmission technique for LDPC coded OFDM cellular systems
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- Authors
- Kwang Soon Kim, Yun Hee Kim, Jae Young Ahn
- Issue Date
- 2004-05
- Citation
- Vehicular Technology Conference (VTC) 2004 (Spring), pp.761-764
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- 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/spl sim/3 dB gain over the conventional system using the mean SNR only, at the expense of only 3 more bits in the feedback information.