1. 시스템별 스펙정리

2. IEEE a
IEEE n

3. IEEE 802.11a (1) Rate-dependent parameters
Table 1 Modulation-dependent normalization factor KMOD

4. IEEE 802.11a (2) Rate-dependent parameters (Cont’)
Fig. 1 BPSK, QPSK and 16QAM constellation bit encoding
Table 2 BPSK, QPSK and 16QAM encoding table

5. IEEE a (3)
Fig. 2 64QAM constellation bit encoding

6. IEEE 802.11a (4) Convoultional encoder
Rate R=1/2 code with generator polynomials
g0=1338 and g1=1718
Higher rates are derived from it by employing “puncturing”
R=2/3 or 3/4
Decoding by Viterbi algorithm is recommended

7. IEEE a (5)
Convoultional encoder (Cont’)

8. IEEE n (1)
Rate dependent parameters for high throughput modulation and coding schemes
Table 1 Symbols used in rate dependent parameters tables
Table 2 Rate dependent parameters for mandatory 20MHz

9. IEEE 802.11n (2) Convoultional encoder
A single FEC encoder is used when the PHY rate is less than or equal 300Mbps or when LDPCC ECC is used.
Rate = ½ code
Higher rates are derived from it by employing “puncturing”
R=2/3, 3/4 or 5/6

10. MB-OFDM UWB

11. MB-OFDM UWB (1) Data rate-dependent modulation parameter
Data Rate (Mb/s)
Modulation
Coding rate (R)
Conjugate Symmetric Input to IFFT
Time Spreading Factor
(TSF)
Overall Spreading Gain
Coded bits per OFDM symbol (NCBPS)
53.3
QPSK
1/3
Yes 4
100 80
1/2
106.7
11/32 No 2
200
160
5/8
320
DCM 1
400
480
3/4
Table 1 Modulation-dependent normalization factor KMOD
Modulation
KMOD
QPSK
1/2
Table 2 QPSK encoding table
Input bit (b0 b1)
I-out
Q-out 00 -1 01 1 10 11
Fig. 1 QPSK constellation bit encoding

12. MB-OFDM UWB (2) Data rate-dependent modulation parameter (Cont’)
Interleaver 1 st 16 -
point
Mapper S / P : 2
IFFT
100
bits nd 50
tone
separation
Fig. 2 Block diagram of DCM
Fig point constellations

13. MB-OFDM UWB (3) Convolutional encoder
Rate R=1/3 code with generator polynomials
g0=1338, g1=1658, and g2=1718
Additional coding rates are derived from the rate R = 1/3 convolutional code by employing “puncturing”
R=1/3, 11/32, ½, 5/8, or 3/4
Decoding by Viterbi algorithm is recommended D
Output Data A
Output Data B
Output Data C
Fig. 4 Convolutional encoder: rate R=1/3, constraint length K=7

14. MB-OFDM UWB (4) Convolutional encoder (Cont’)
Fig. 5 An example of the bit-stealing and bit-insertion procedure (R=11/32)

15. T-DMB

16. T-DMB (1) 지상파 DMB 개념도 DAB (Eureka-147) PAD NPAD FIC MSC Audio Service
MPEG4 LIVE TV
Block Code
DAB (Eureka-147)
FIC
MSC
Service
Data Service
K-DMB Service
FIDC 2 Ch
Multi
Ch. D L S
MOT IP
Tunneling
TDC
MPEG4
A/V
Data
MCI
& SI T C
EWS
Broadcasting Web Site
Interactive Service
JPEG Slide Show
TPEG, DGPS etc

17. T-DMB (2)
DAB (Eureka-147) 구조도

18. T-DMB (3) Convolutional Coding (Mother Code) P/S Constraint: 7
Memory: 6
Code rate: ¼
Generating polynomial: (133, 171, 145, 133)o
all-zero initial state of the shift register
Output codeword
P/S
To puncturing
procedure

19. T-DMB (4)
Puncturing Block
Mother code의 일부 bit가 결정된 순서에 따라 전송되지 않음

20. T-DMB (5) Puncturing Block (cont’d)
vPI,i = 0 : the corresponding bit shall not be transmitted
vPI,i = 1 : the corresponding bit shall be transmitted

21. T-DMB (6) Phase Reference Symbol
Reference for the differential modulation for the next OFDM symbol
Mode II

22. T-DMB (7)
QPSK Symbol Mapper

23. T-DMB (8) Differential Modulation
Applied to the QPSK symbols on the same carriers between two consecutive OFDM symbols
8 possible phase states

24. Wibro

25. WiBro IEEE 802.16 + Wibro (1) 2.3GHz 휴대인터넷 국내 기술 기준  60km/h로 이동시,
셀 경계에서 최소 하향 512kbps,
상향 128kbps 보장
 채널대역폭 ≥ 9 MHz
 사업자 장비간 로밍 가능
 주파수 재사용계수 = 1
 이중화 방식 = TDD
(송수신 time slot간 동기 일치)
IEEE +
WiBro
주요 파라미터
사용 대역
2.3 GHz
채널 대역폭
8.75 MHz
프레임 길이
5ms
다중접속방식
OFDMA
이중화 방식
TDD
FFT 크기
1024
변조 방식
QPSK, 16-QAM,
64-QAM
채널 부호화
Convolutional
Turbo Code
ARQ
Hybrid ARQ

26. Wibro (2)
Wibro 송수신 블록도

27. Wibro (3) Convolution Turbo Code (CTC)
Dual binary circular recursive systematic convolutional (CRSC)

28. Wibro (4)
CTC interleaver
First permutation
Second permutation

29. Wibro (5)
Mapping
QPSK
16QAM
64QAM

30. CDMA (IS-95)
WCDMA

31. CDMA (1) System parameter Duplex mode : FDD and TDD
Ddata modulation : QPSK(downlink) BPSK(uplink)
Channel coding : convoultional and turbo codes
Convolutional coding rate = 1/3 or ½ with constraints length 9
Turbo coding rate = 1/3
Turbo coding scheme is a parallel concatenated convoultional code (PCCC) with 8 state constituent encoders
Fig. 1 Overall eight-state PCCC turbo coding

32. CDMA (2) Convolutional Encoder
Forward Link & Rate set 2 Reverse Link ;
R = 1/2, K = 9, g0 = 753(8)= (2)
g1 = 561(8)= (2)
‘1’ : Connection
‘0’ : Disconnection
ex) Forward link g0 c0
Data
bits
input
Code
Symbols
Output g1 c1

33. CDMA (2)
CMDA 순방향채널의 I, Q 데이터와 위상 1 I Q 위상
/4
3/4
-3/4
-/4

34. WCDMA (1) System parameter Duplex mode : FDD and TDD
Ddata modulation : QPSK(downlink) BPSK(uplink)
Channel coding : convoultional and turbo codes
Convolutional coding rate = 1/3 or ½ with constraints length 9
Turbo coding rate = 1/3
Turbo coding scheme is a parallel concatenated convoultional code (PCCC) with 8 state constituent encoders
Fig. 1 Overall eight-state PCCC turbo coding

35. WCDMA (2)
Modulation
The complex-valued chip sequence generated by the spreading process is QPSK modulated
The pulse shaping is root-raised cosine with roll-off factor 0.22 and is the same for the mobile and base stations
Fig. 2 Modulation principle