Design of FH/TH hybrid spread spectrum system
based on FPGA
Longjun Liu
School of Information, yunnan University
Kunming, China
893817028@qq.com
Qianlin Liu
School of Information, yunnan University
Kunming, China
liuqianlin@sina.com
Hongwei Ding
School of Information, yunnan University
Kunming, China
dhw1964@163.com
Weifeng Zhang
School of Information, yunnan University
Kunming, China
767950080@qq.com
Abstract—
According to the present situation of the
application of frequency hopping system, the existence question
and the characteristic of the frequency hopping,time hopping
system, based on the thought of complementary advantages and
disadvantages, this paper puts forward a hybrid spread
spectrum. It is to combine two kinds of spread spectrum with
frequency hopping and time hopping to constitute a FH/TH
hybrid spread spectrum system. We have conducted simulation
and FPGA implementation for the FH/TH hybrid spread
spectrum system and verify the validity of the design system.
Keywords—FH/TH; hybrid spread spectrum; simulation;
FPGA
1. INTRODUCTION
As two aspects of the jumping expansion system,
frequency hopping and time hopping have their own
1
National Natural Science Foundation (61461053, 61461054, 61072079),
Yunnan Province Natural Science Fund (2010CD023), Yunnan University
Fund (NO. XT412004).
advantages and disadvantages. This makes the two jump way
on the development and application is not the same. The
principle of frequency hopping is to make the carrier that is
used to send the modulation jump on the different frequency,
which makes the frequency of the emission signal jump
continuously in a wide frequency range [1]. As a result, it is
difficult to conduct frequency interference and intercept
decoding for the frequency hopping signal in the case without
knowing the frequency-hopping pattern. Frequency hopping
system has many fine properties, such as strong
anti-interference ability, high confidentiality, strong resistance
to multipath fading and multiple access capability, etc. These
properties make it rapid development and wide application in
the field of military and mobile communication. However, due
to the extremely wide range of applications of frequency
hopping technology, it has formed equipment in different
frequencies. According to relevant information, foreign armies
has formed a valid tracking ability to low and medium speed
(500/second) frequency hopping communications with
frequencies under 500~1000MHz [3]. This will make the
advantage of using frequency hopping system not be able to
play. With the development of ultra wideband UWB
International Conference on Computer Science and Electronic Technology (CSET 2016)
© 2016. The authors - Published by Atlantis Press
112
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