Novel Space Time Spreading Scheme

  • Ahmed Abdel Hadi Fadhel Electrical & Electronic Engineering Department College of Engineering University of Thi_Qar
Keywords: Space time spreading, Direct sequence code division multiple access, Layered space time coding, Bit error rate, Flat fading

Abstract

In this paper two spreading schemes and their detection methods were proposed and
compared. The comparison depends on the performance of each scheme in Rayleigh flat
fading channel. Space Time Spreading (STS) codes are used with Layered Space Time Codes
(LST), with Vertical Bell Laboratories Space Time codes (V-BLAST) in particular. Also,
Direct Sequence Code Division Multiple Access system (DS-CDMA) was used as a multiuser
criterion.
As
a
result
of
this
spreading,
a
simple
decoding
algorithm
was
used.
The
simulation
shows
that
STS-LST-DS-CDMA
system
with
3TX-3RX
(3
transmitting
antennas3
receiving
antennas)
using
all
paths
between
transmitter
and receiver
was better
than
LSTDS-CDMA
system
by
about
4dB in
SNR at
BER
of
10
-4
. More detailed results are shown in
Table 1. Also, the proposed scheme (may be partially) solves the problem of the code reuse.
Published
2019-04-29
Section
Articles