Power Diversity for MIMO Systems with V-BLAST Detection
Date Issued
2007
Date
2007
Author(s)
Chuang, Chia-Hung
DOI
en-US
Abstract
As the multimedia applications become popular in our daily life, there is an increasing demand for wireless communication technology that supports high transmission rate. Vertical Bell Laboratories Layered Space-Time (V-BLAST) is one of the most popular Multiple Input Multiple Output (MIMO) architectures that achieve very high spectral efficiency and thus high transmission rate. In this thesis, we propose the use of power diversity scheme to minimize the bit error rate of V-BLAST systems. The essence of power diversity scheme is to intentionally cause different received power from each layer at the receiver. By judiciously allocating the transmitting power to the layers, the performance of the successive interference
cancellation at the receiver can be significantly improved.
The exact bit error rate (BER) of the V-BLAST systems with non-uniform power allocation under is analyzed for both fast and slow Rayleigh fading cases. The BER is optimized for each of the fading cases to find the optimal power allocation pattern for the V-BLAST systems. For slow fading cases, we propose the optimal and a suboptimal power control to achieve power diversity on the V-BLAST systems. While the optimal power control minimizes the BER, the suboptimal power control offers a good balance between the BER and the computation complexity required. Simulations show that our BER analysis is accurate and the proposed power diversity
scheme significant improve the performance of the V-BLAST systems.
Subjects
垂直分層空時碼
多輸入多輸出
雷利
快速衰減
慢速衰減
功率多樣性
功率控制
位元錯誤率
V-BLAST
MIMO
BER
Rayleigh
fast fading
slow fading
power diversity
power control
bit error rate.
Type
thesis