149 research outputs found
New Methods to Construct Golay Complementary Sequences Over the Constellation
In this paper, based on binary Golay complementary
sequences, we propose some methods to construct Golay complementary
sequences of length for integer n, over the -
constellation and -- constellations, where for
integer . A method to judge whether a sequence constructed using
the new general offset pairs over the constellation is Golay
complementary sequence is proposed. Base on this judging rule, we
can construct many new Golay complementary sequences. In particular,
we study Golay complementary sequences over - constellation
and - constellation,many new Golay complementary sequences
over these constellations have been found
Golay Complementary Sequences Over the QAM Constellation
In this paper, we present new constructions for
-QAM and - Golay complementary sequences of length
for integer , where for integer . New
decision conditions are proposed to judge whether an offset pairs
can be used to construct the Golay complementary sequences over
constellation, and with the new decision conditions, we prove the
conjecture 1 proposed by Ying Li~\cite{16}. We describe a new offset
pairs and construct new - Golay sequences based on this new
offset pairs. We also study the - Golay complementary
sequences, and propose a new decision condition to judge whether the
sequences are - Golay complementary
A Generalized Construction of OFDM M-QAM Sequences With Low Peak-to-Average Power Ratio
A construction of -QAM sequences is given and an upper bound of the
peak-to-mean envelope power ratio (PMEPR) is determined. Some former works can
be viewed as special cases of this construction.Comment: published by Advances in Mathematics of Communication
Simulation framework for multigigabit applications at 60 GHz
This dissertation describes the implementation of a OFDM-based simulation framework
for multigigabit applications at 60 GHz band over indoor multipath fading channels.
The main goal of the framework is to provide a modular simulation tool designed
for high data rate application in order to be easily adapted to a speci c standard or
technology, such as 5G. The performance of OFDM using mmWave signals is severely
a ected by non-linearities of the RF front-ends. This work analyses the impact of RF
impairments in an OFDM system over multipath fading channels at 60 GHz using the
proposed simulation framework. The impact of those impairments is evaluated through
the metrics of BER, CFR, operation range and PSNR for residential and kiosk scenarios,
suggested by the standard for LOS and NLOS. The presented framework allows
the employment of 16 QAM or 64 QAM modulation scheme, and the length of the
cyclic pre x extension is also con gurable. In order to simulate a realistic multipath
fading channel, the proposed framework allows the insertion of a channel impulse response
de ned by the user. The channel estimation can be performed either using
pilot subcarriers or Golay sequence as channel estimation sequences. Independently of
the channel estimation technique selected, frequency domain equalization is available
through ZF approach or MMSE. The simulation framework also allows channel coding
techniques in order to provide a more robustness transmission and to improve the link
budget
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