(Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical...
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Transcript of (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical...
![Page 1: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/1.jpg)
(Semi) Blind Channel Estimation & Data Recovery in OFDM
Presented by: Ahmed Abdul QuadeerElectrical Engineering Department
2nd Graduates Seminar Day
![Page 2: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/2.jpg)
Outline
![Page 3: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/3.jpg)
Wireless Communication System
Transmitter Channel Receiver
![Page 4: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/4.jpg)
OFDM
![Page 5: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/5.jpg)
Problem
Transmitter Channel Receiver
X H Y = H ʘ X
X = Y ./ H
![Page 6: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/6.jpg)
Channel Estimation Techniques
![Page 7: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/7.jpg)
= HELLO
Training Based Technique
Transmitter Channel Receiver
HELLO ЧҒҐЮҨ
X H Y = H ʘ XY and X known
H = Y ./ X Wireless channel is time variant.
Necessary to train periodically Low Bandwidth Efficiency.
HELLO = HELLOℏℱℰℳℭ
![Page 8: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/8.jpg)
Blind Technique
Transmitter Channel Receiver
No training used. Utilize structure of the communication system:
Finite Alphabet Set
Time Correlation
Coding
Data Transmitted = {A, B, C, D}
A 000 and B 111
t
![Page 9: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/9.jpg)
Semi-Blind Technique
Transmitter Channel Receiver
Hybrid of Training and Blind techniques.
Training signal as well as other constraints of communication system are utilized.
![Page 10: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/10.jpg)
Data Aided Technique
Use the refined channel estimate to detect data again. Joint Channel Estimation and Data Detection.
Use detected data to improve the channel estimate .X H
![Page 11: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/11.jpg)
Conclusion
LOW HIGH
Trade off between Computational Complexity and Bandwidth Efficiency
Complexity
Bandwidth Efficiency
![Page 12: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/12.jpg)
![Page 13: (Semi) Blind Channel Estimation & Data Recovery in OFDM Presented by: Ahmed Abdul Quadeer Electrical Engineering Department 2 nd Graduates Seminar Day.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649eb55503460f94bbe9f7/html5/thumbnails/13.jpg)
Explanation