Adaptive Modulation and Transmission Scheme for Hybrid MIMO System over Spatial Correlated Fading Channels

• Main Authors: Chieh-Long Hsieh, 謝傑隆
• Other Authors: 林丁丙
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/n9m5gu

碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 97 === Multiple-Input Multiple-Output (MIMO) system is one of methods for increasing system capacity and reliability in high data rate wireless communications. Adaptive hybrid MIMO system is a scheme of multi-antenna wireless communication. The receiver can feedback limited data to the transmitter and the transmitter utilizes different modulations, codes, power, and antenna allocation to achieve the best performance and maximize the throughput under the different channel situation. For the conventional hybrid MIMO system, the BER in different transmission scheme is dissimilar. A single modulation order doesn’t suit to all hybrid MIMO systems. Hence, for the different schemes and channels, we use an adaptive modulation algorithm for a MIMO system to minimize BER under a fixed data rate. Traditional adaptive systems enhance the throughput of the system by increasing the modulation orders. The multi-antenna can provide the diversity gain (STBC) and multiplexing gain (VBLAST) and their benefits can be revealed when working at the high SNR and low SNR separately. Hence, we can use the spatial multiplexing to increase the system throughput. Therefore, we propose an adaptive hybrid MIMO transceiver scheme in a fixed transmission antenna system. The transmitter is based on power allocation and antenna allocation with both average SNR and partial channel state information (CSI) feedback to maximize the throughput.