Adaptive differential amplitude pulse-position modulation technique (DAPPM) using fuzzy logic for optical wireless communication channels
In the past few years, people have become increasingly demanding for high transmission rate, using high-speed data transfer rate, the number of user increased every year, therefore the high-speed optical wireless communication link have become more popular. Optical wireless communication has t...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English English |
| Published: |
2012
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2259/1/24p%20BONG%20SIAW%20WEE.pdf http://eprints.uthm.edu.my/2259/2/BONG%20SIAW%20WEE%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2259/3/BONG%20SIAW%20WEE%20WATERMARK.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In the past few years, people have become increasingly demanding for high
transmission rate, using high-speed data transfer rate, the number of user increased
every year, therefore the high-speed optical wireless communication link have
become more popular. Optical wireless communication has the potential for
extremely high data rates of up to tens of Gigabits per second (Gb/s). An optical
wireless channel is usually a non-directed link which can be categorized as either
line-of-sight (LOS) or diffuses. Modulation techniques have attracted increasing
attention in optical wireless communication, therefore in this project; a hybrid
modulation technique named Differential Amplitude Pulse-Position Modulation
(DAPPM) is proposed to improve the channel immunity by utilizing optimized
modulation to channel. The average symbol length, unit transmission rate, channel
capacity, peak-to-average power ratio (PAPR), transmission capacity, bandwidth
requirement and power requirement of the DAPPM were determined and compared
with other modulation schemes such as On-Off Key (OOK), Pulse-Amplitude
Modulation (PAM), Pulse-Position Modulation (PPM), Differential Pulse-Position
Modulation (DPPM), and Multilevel Digital Pulse Interval Modulation (MDPIM).
Simulation result shows that DAPPM gives better bandwidth and power efficiency
depending on the number of amplitude level (A) and the maximum length (L) of a
symbol. In addition, the fuzzy logic module is developed to assist the adaptation
process of differential amplitude pulse-position modulation. Mamdani fuzzy logic
method is used in which the decisions made by the system will be approaching to
what would be decided by the user in the real world. |
|---|