文档介绍：Abs t rac t
Title: THE RESEARCH ON DIFFERENTIAL SPACE TIME CODING FOR FSO MIMO SYSTEM
Major: Circuit and System Name: . Ting Cheng Supervisor: Ke
Zhao
Abstract
Signature 却 c叫 Signature:羊均民 Signature也乡、血。
Free Space munication munication technolo gy that to use laser beam as
a canler.
with
alr
as the
t ran sml SSlon
medium
for data,vOlce,v ideo inform ation .
The
advantages of
pared with radio frequency (RF) communications,
include
a much
larger
capaclty,lower
power
con sumptIOn ,greater
secunty
agamst
eavesdropping,and better protection against interference,thus in some field has a broad
prospect of application,such as munication,optical fiber backup,local
area
network interconnection,mili tary fields and other fields and e the next generation of munication research hotpot. Atmospheric turbulence effect is the main factor of
channel transmission
per
shows
that
use
multiple laser
emJ SSIOn
and
multiple receiving apertures to build multiple-input multiple-output system
can effectively
reduce atmospheric turbulence caused by the scintillation effect. Space-time coding e a hot pot in MIMO technology field,its main idea is to use the space and time coding achieve certain space diversity and time diversity,which can reduce the bit eηor rate,and improve the
perfoffilance munication system.
In the paper the major work includin g:
Introdu ced the concept of MIMO
technology and space-time coding technology,
Classification introduced that according to whether or not to make channel estimation to the existing space-time coding technology.
2. Analysed the multiple-input multiple-output (MIMO) composition and model of the
optical
commUl1lCatIOn
sytem,and
establi shed
optical
channel
model
based
on PPM
modulating.
According to
different chamlel
environment,the
standard logarithmic
non