1. Comm Final Project Proposal 802.11a Physical Layer
第一組
電機四 B 蔡馭理
電機四 B 溫建樹
資工四 B 智障鴻

2. 802.11a Physical Layer Structure

3. Modulation
OFDM transmit infomation by modulated signal and always use M-PSK, M-QAM.
M-PSK modulation
M-QAM

4. 802.11a Modulation Mode

5. Concept of Serial/Parallel

6. Inverse Fast Fourier Transform
We use IFFT to represent OFDM signal.
IFFT and Muti-carrier wave are same.

7. OFDM Signal Consider a serial data and
The m-st output signal is (IFFT output)
means signal length

8. OFDM Signal
We only consider real part
Pass low pass filter

9. Our project schedule 12/06~12/13 (1)OFDM reading
(2)FFT and IFFT implement
12/13~12/20 (1)S/P and P/S
(2)Combine all the component
12/20~12/27 (1)AWGN and Fading channel
(2)Add and Remove Guard Interval
12/27~01/03 (1)Modulatotion and Demodulation
(2)Pilot Sequence and Equalizer
01/17~01/24 (1)Convolution Encoder and Decoder
(2)Interleaver and De-interleaver
(3)Combine and finish a

10. 802.11a Physical Layer Structure
We want to implement the structure.
Implement by C or C++ language.
We may do some different modulation to get different result.
The structure mainly is OFDM, so we intend to do from OFDM.
If the time is enough, we continue to do a Physical Layer.

11. Reference
1.通訊系統設計與模擬 2. 3.
4.Google