US006490267B1
(12) United States Patent
(10) Patent N0.:
Kim et al.
(54)
US 6,490,267 B1
(45) Date of Patent:
Dec. 3, 2002
DEVICE AND METHOD FOR GENERATING
5,400,359 A
*
3/1995 Hikoso et al. ............... .. 375/1
SPREADING CODE AND SPREADING
CHANNEL SIGNALS USING SPREADING
5,483,550 A
5,712,869 A
*
*
1/1996 Hulbert ........ ..
1/1998 Lee et a1. ................. .. 375/206
CODE IN A CDMA COMMUNICATION
SYSTEM
OTHER PUBLICATIONS
Ojanpera and Ramjee, Wilde Band CDMA for Third Gen
eration Mobil Communications, copyright 1998, Artech
House Publishers, pp. 51—55, 115—119, and 173—174.*
(75) Inventors: JJe-Woo
ung-Hyo
Kim,
Woo,
Kyonggi-do
PusankWangyok-shi
(KR); Chang-Soo Park, Seoul (KR);
Rappaport, Wireless Communications, copyright 1996,
J ae-Min Ahn, Seoul (KR)
Prentice Hall PTR, pp. 242—251.*
(73) Assignee: Samsung Electronics, Co., Ltd. (KR)
(*)
Notice:
Subject to any disclaimer, the term of this
patent is extended or adjusted under 35
U.S.C. 154(b) by 0 days.
* cited by examiner
Primary Examiner—Nay Maung
Assistant Examiner—Tanmay Lele
(74) Attorney, Agent, or Firm—DilWorth & Barrese, LLP
(57)
(21) Appl. No.: 09/407,537
ABSTRACT
A spreading code generating device for a Code Division
(22) Flled:
Sep' 29’ 1999
(30)
Foreign Application Priority Data
Sep' 29’ 1998
(KR) ' ' ' ' '
Multiple Access (CDMA) communication system. The
device comprises a PN (Pseudorandom Noise) code
sequence generator for generating PNi and PN, sequences;
' ' ' " 1998-40507
......
. . . . . . . . . . . . . . . . . . . . . . . ..
H04B 7/216
an orthogonal code generator for generating ?rst and second
(51)
Int. Cl.7
(52)
US. Cl. ..................... .. 370/342; 370/335; 375/146;
(58)
Field of Search ............................... .. 370/335 342
mg Codes Ci and Cq by mixing the PN- and PNq Code
370/320 441. 375/140 145 146 149’
sequences With the ?rst and second orthogonal codes such
375/140
’
(56)
’
’
’
’
Orthogonal
Codes
Which
perform
Differential
Phase
Shift
Keying (DPSK) State transitions at intervals of at least two
chips; and a spreading code generator for generating spread
that a present phase of the spreading codes C,- and Q,
References Cited
alternately makes Quadrature Phase Shift Keying (QPSK)
and DPSK state transitions With respect to a previous phase
U-S~ PATENT DOCUMENTS
of the spreading codes C, and Cq.
5,228,054 A
*
7/1993
5,309,474 A
*
5/1994 Gilhousen et al. ........... .. 375/1
Rueth et a1. ................. .. 375/1
431
432
27 Claims, 20 Drawing Sheets
CHANNELIZED DATA
DPSK
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QPSK
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QPSK
:1|DURAT|ON|
-—CH|P:
TIME
REFERENCE
DPSK
QPSK
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DPSK
QPSK
U.S. Patent
Dec. 3, 2002
Sheet 3 0f 20
US 6,490,267 B1
(1,1)
V
(-1,-1)
FIG. 3
FIG. 4
U.S. Patent
Dec. 3, 2002
Sheet 4 0f 20
4L
(_1Q1<)——————O(1,1)
FIG. 5
{(1.1)
(1H)
FIG. 6
US 6,490,267 B1
U.S. Patent
Dec. 3, 2002
Sheet 5 0f 20
US 6,490,267 B1
211
OC1(++)
C;
212
oc2(+-) —
cq
PN
FIG. 7
221
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DEClMATOR
FIG. 8
PNq
U.S. Patent
Dec. 3, 2002
Sheet 7 0f 20
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U.S. Patent
Dec. 3, 2002
Sheet 8 0f 20
US 6,490,267 B1
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U.S. Patent
Dec. 3, 2002
Sheet 9 0f 20
US 6,490,267 B1
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U.S. Patent
Dec. 3, 2002
Sheet 10 0f 20
US 6,490,267 B1
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U.S. Patent
Dec. 3, 2002
511
Sheet 11 0f 20
5/15
5/12
ORTHOGONAL
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= COMPLEX
SPREADER
_ DELAY
>MULTIPLIER
US 6,490,267 B1
51<
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U.S. Patent
US 6,490,267 B1
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U.S. Patent
Dec. 3, 2002
Sheet 14 0f 20
US 6,490,267 B1
PN i
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FIG. 18
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U.S. Patent
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Dec. 3, 2002
Sheet 16 0f 20
DECIMATOR
FIG. 20A
US 6,490,267 B1
U.S. Patent
Dec. 3, 2002
Sheet 17 0f 20
US 6,490,267 B1
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U.S. Patent
Dec. 3, 2002
1211
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US 6,490,267 B1
Sheet 18 0f 20
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U.S. Patent
1311
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Dec. 3, 2002
Sheet 19 0f 20
US 6,490,267 B1
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