Implementation of multi carrier-code division multiple access-frequency division multiple access with beyond 4G specifications
Hybrid code division multiple access techniques present the open door for the future of code division multiple access and wireless communications. Multicarrier CDMA is the most popular type of hybrid CDMA because of its robustness against multipath fading channels and flexible multiple access...
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| 格式: | Thesis |
| 语言: | English English English |
| 出版: |
2013
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| 主题: | |
| 在线阅读: | http://eprints.uthm.edu.my/2201/1/24p%20MAYADA%20FARIS%20GHANIM%20ALOMARY.pdf http://eprints.uthm.edu.my/2201/2/MAYADA%20FARIS%20GHANIM%20ALOMARY%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2201/3/MAYADA%20FARIS%20GHANIM%20ALOMARY%20WATERMARK.pdf |
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| 总结: | Hybrid code division multiple access techniques present the open door for the future of
code division multiple access and wireless communications. Multicarrier CDMA is the
most popular type of hybrid CDMA because of its robustness against multipath fading
channels and flexible multiple access capability. MC-CDMA is a predictable technique
for future high data rate wireless communication systems according to these appealed
properties. The main drawback of MC-CDMA is the power level in uplink, i.e. the ratio
of peak power to the average power is high and leads to high instantaneous power which
is required in transmission of mobile station. However, there are many researchers
working towards reducing the level of the transmitted power. This research presents new
method of peak to average power ratio (PAPR) reduction. The proposed method is
making use of the characteristics of uplink for current 4th Generation (single carrier
frequency division multiple access) which has low PAPR into current MC-CDMA
system to reproduce a new MC-CDMA system (MC-CDMA-FDMA) with low PAPR
and keep all the characteristics of the basic MC-CDMA system. MC-CDMA-FDMA
reduced the level of power from 10 dB to 2 dB in case of 64 FFT size and Walsh
Hadamard code is used in spreading block. In addition bit error rate has been reduced
from 96x10-5
bps to 82x10-5
bps comparing to SC-FDMA bit error rate. The proposed
system also has high flexibility to deal with modern communication systems with
minimum required hardware at the base station through optimization of FFT size. The
simulation results show that MC-CDMA-FDMA system will be a good candidate for
beyond 4th Generation for mobile communications |
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