daigai

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Phức tạp MMSE
Detector Architectures cho MIMO
OFDM

I. INTRODUCTION
The ever increasing data rates in wireless communication
systems require the use of large bandwidths. Orthogonal
frequency division multiplexing (OFDM) [1] has become
a widely used technique to significantly reduce receiver
complexity in broadband wireless systems. Multiple-input
multiple-output (MIMO) channels offer improved capacity
and significant potential for improved reliability compared
to single antenna channels [2]. In the case of rich scatter
ing environment layered space-time (LST) architectures [3],
[4] combined with channel coding represent pragmatic yet
powerful methods to increase the user data rate in systems
with multi-element antenna arrays (MEAs). MIMO techniques
in combination with OFDM technique (MIMO-OFDM) have
been identified as a promising approach for high spectral
efficiency wideband systems [5], [6].
The OFDM technique drastically simplifies receiver design
by decoupling the intersymbol interference, i.e., a frequency
selective, MIMO channel into a set of parallel flat fading
MIMO channels [6]. However, the reception of the MIMO
OFDM signal has to be performed separately for each sub
carrier. The optimal joint detection and decoding for LST
architectures would require the use of a maximum likelihood
(ML) algorithm. However, the computational complexity of
optimal ML decoding is beyond the limit of most systems, and,
thus, such an approach is not feasible. A suboptimal approach
is to use separate suboptimal solution steps for detection and
decoding, such as zero forcing (ZF) and minimum mean






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