MIMO Channel Characteristics and Transmission Performance in Various Indoor Environments
Date Issued
2005
Date
2005
Author(s)
Yeh, Ta Chien
DOI
en-US
Abstract
As the increase of applications of wireless communications, high transmit rate becomes an important research topic. The Multiple-Input-Multiple-Output architecture is one of the solutions. In order to design a better MIMO system in the indoor environments, we study the characteristics of channels. We observe that blocking LOS doesn’t increase the capacity because the receiver SNR is reduced. We also demonstrate that MIMO techniques are more effective in increase channel capacity than phased array techniques at high SNR.
Then, we build up three architectures of a 4x4 MIMO OFDM system which are categorized as (1) using all four sub-channels, (2) using only three sub-channels and (3) using adaptive bit and power loading algorithms for data transmission. We demonstrate that using only three sub-channels by discarding the sub-channel with the smallest singular value is a simple method to improve the performance. Using the adaptive bit and power loading algorithm can effectively increase the data rate and make BER stable at different Rx locations.
Subjects
多輸入多輸出型態
射線追蹤法
通道
MIMO
Ray tracing
channel
Type
thesis