Semi-Soft Decision VBLAST Detection Algorithm for Spatial Multiplexing System
Date Issued
2006
Date
2006
Author(s)
Tzeng, Jian-Rong
DOI
en-US
Abstract
For a general MIMO system, we usually use the vertically co-polarized antenna arrays at both transmitter and receive ends. If we use cross polarization antenna scheme symmetrically in both ends, the capacity is higher than conventional antenna polarization scheme under the LOS condition due to the high isolation between orthogonal polarizations. However, in NLOS condition, the result is contrary because of the loss of power gain.
VBLAST is an efficient detection algorithm for MIMO system, the performance, however, is still far from optimal ML algorithm. Therefore, several modified algorithm has been proposed and we implement them to compare their performance. Finally, we propose a new modified algorithm called semi-soft decision VBLAST. Simulation results show that our proposed algorithm not only outperform than conventional VBLAST considerably but also can be easily combined with any kind of VBLAST algorithms and their modified version to achieve more tremendous performance.
VBLAST-OFDM is introduced to convert common frequency-selective fading channel into Rayleigh fading channel which is suitable for VBLAST. Channel model adopted by next-generation WLAN standard, 802.11n, is used in our simulation. Channel estimation algorithm is also considered. There is more interference when more antennas are used and the nulling operation cannot work well in the correlated channel. Consequently, in the correlated channel, using more antennas cannot guarantee the higher performance as what we can see in i.i.d. channel.
Subjects
空間多工
偵測
多天線傳輸
VBLAST
MIMO
spatial multiplexing
detection
Type
thesis
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