Transcript Research Topics of Prof. Ueng

Department of Electrical Engineering
National Tsing Hua University
Research Topics
of
Prof. Yeong-Luh Ueng
（翁詠祿）
[email protected]
http://www.ee.nthu.edu.tw/~ylueng
Training in Our Lab
Communication Systems
Error Correcting Coding
System Algorithms
Co-design of algorithm and IC implementation
is highly desired for the development of
advanced SoC (System on Chip) in the areas
of industry or academic research.
System Architectures
IC Architectures
IC Circuit Design
Digital Communication
Computer Organization
VLSI Design and Lab
Communication Systems
Suggested
BackgroundSignals and Systems
Logic Design
Digital Signal Processing
Research Topics
Research Focus (MIMO-OFDM)
Information
Source
Source
Encoding
Channel
Encoding
OFDM
Modulator
MIMO
Channel
Information
Destination
Source
Decoding
Channel
Decoding
OFDM
Demodulator/cha
nnel estimator
Research Focus
Research Focus :
MIMO, MIMO-OFDM, LDPC codes,
Turbo codes
Topic 1
Communication Systems (Baseband Part)
Design good algorithms used in
synchronization, channel estimation and
demodulation which are suitable for IC
implementation for modern MIMO, OFDM
and MIMO-OFDM based communication
systems.
Space-time coding for MIMO-based
communication systems.
Communication Systems vs Circuit Architecture
Circuit Architecture
Communication System
MIMO Systems
T
x
R
x
Space-Time Coding : Increase Diversity
T
x
R
x
Spatial Multiplexing: Increase Rate
Tx
Rx
1：1
SISO
Tx
R
Rx
MIMO 2 ：2
MIMO Channels
(Rich-Scattering Channels)
Topic 2
Communication Systems (RF Part)
• Study the effect of circuit impairment on the
performance of wireless communication
systems.
• Compensate the effect of circuit impairment on
the performance of communication systems by
using digital signal processing algorithm.
• An important topic since some RF IC
specifications are based on this study.
Communication Receiver with RF Processing
Topic 3
Error-Correction Codes
(Code Design & Application)
• Design good error correction codes (ECC)
with the constraint imposed by the real
applications and IC implementation.
• Apply some popular codes such as Turbo
codes, LDPC codes on real applications such
as 4G, DVD, optical communication and
broadcasting with necessary modifications.
Topic 4
Error-Correction Codes (Codec IC Design)
• Develop the state-of-art codec
(coder and decoder) for some
standards such as 3G, WiMAX
and DVB.
LDPC code codec
Turbo code codec
Product code codec
ECC FAMILY
BLOCK CODES
CONVOLUTIONAL CODES
BHC
BOSE-CHAUDHURI
&…
ODS
OPTIMUM DISTANCE SPECTRUM
RS
REED SOLOMON
RCC
RATE COMPATIBLE CONVOLUTIONAL
BLOCK TURBO CODE
RCPC
RATE COMPATIBLE PUNCTURED
LDPC
LOW DENSITY PARITY
CODE
NESTED CONVOLUTIONAL CODES
Turbo encoder / decoder
Noise
u1, u2, u3, …
Encoder1

Encoder2
p11, p21, p31, …
p12, p22, p32, …
MUX
and
Puncture
x
-1
y
D
E
M
U
X
û i
pˆ 1 i
pˆ 2 i
Decoder1

Decoder2
y
Circuit Architecture of LDPC Decoder
MEMORY
MEMORY
Bit to
Check
Check
to Bit
MEMORY
MEMORY
Topic 5
Communication IC
Develop key signal processing engines in MIMO,
OFDM and MIMO-OFDM based communication
systems.
Develop key signal processing engines in
communication standards such as Bluetooth EDR,
UWB, WiMAX, and DVB.
WiMAX (802.16) Standard
DVB (Digital Video Boradcasting)
Welcome to Join with Us
If you are interested in our lab. Please
contact Y.L. Ueng (翁詠祿)
[email protected]
(03) 5162208
Face-to-Face : 資電館307
For more information, please see the web site:
http://ee.nthu.edu.tw/~ylueng