Jan 4, 1995 - Assignee: Qualcomm Incorporated, San Diego,. Calif. Appl. No.: 368,570. Filed: ... Golomb et al., Prentice Hall, Inc. 1964, pp. 45-64. Primary ...
US005691974A
United States P31101113 [19]
[11] Patent Number:
Zehavi et al.
[45]
[54]
METHOD AND APPARATUS FOR USING FULL SPECTRUM TRANSMITTED POWER IN A SPREAD SPECTRUM
Date of Patent:
5,691,974 Nov. 25, 1997
5,131,006 7/1992 Kamerman a a1. .................. .. 375/200 5,166,951 11/1992 Schilling ........ .. 375/200 5,228,054 7/1993 Rueth et a1. .......................... .. 375/200
COMMUNICATION SYSTEM FOR TRACKING INDIVIDUAL RECIPIENT
(List continued on next page.)
PHASE, TIME AND ENERGY
OTHER PUBLICATIONS
[75] Inventors: Ephraim Zehavi, Haifa, Israel; Stephen S. Carter, San Diego, Cali?;
Digital Communications with Space Applications, S.W. Golomb et al., Prentice Hall, Inc. 1964, pp. 45-64.
Klein S. Gilhousen, Bozeman, Mont.
Primary Examiner-—Alpus H. Hsu
[73] Assignee: Qualcomm Incorporated, San Diego,
Assistant Examiner—Seema S. Rao
Calif.
Attomey, Agent, or Firm—-Russell B. Miller; Gregory D.
Ogrod [21] Appl. No.: 368,570 Jan. 4, 1995 [22] Filed: [5 1] 1111, cr.6 ........................... .. H04J 13/02; H04B 7/216 [52] US. Cl. ........................ .. 370/203; 370/209; 370/210; 370/441; 370/479; 370/320; 370/516; 375/208; 375/326; 375/375
[5 3]
Field of Search ................................... .. 375/200, 205,
375/208, 375, 316, 326, 349, 325, 339, 354, 362, 371, 260, 279, 280, 282-284, 373, 376; 370/18, 19, 20, 21, 22, 23, 100.1, 203, 208. 209, 318, 310, 315, 316, 320, 328, 329, 335, 343, 344, 350, 431, 441, 464, 479, 480
6/1987 Beier ..................................... .. 375/200
4,761,795
8/1988
4,807,256
2/1989 Holmes et a1.
.... .. 375/344
9/1989
. . . . ..
4,866,395
Beier
... .... . .. ...
Hostetter
makes more e?icient use of available carrier frequency and
phase information by utilizing a substantial portion or all of the energy occupying the frequency spectrum of a received carrier signal, including energy from communication signals intended for other system users. Multiple spread spectrum cormnunication signals are input in parallel to data receivers
where they are despread using preselected despreading codes at an adjustable phase angle and decoded over mul
tiple orthogonal codes active within the communication system. Multiple decoded signals are then combined to form a single phase detection signal which is used by at least one
loop generates a timing signal which is used to adjust the
U.S. PATENT DOCUMENTS 4,672,629
Method and apparatus for tracking the frequency and phase of signals in spread spectrum communication systems that
tracking loop to track frequency and phase of the carrier signal for the received communication signals. The tracking
References Cited
[5 6]
ABSTRACT
[57]
. . . . ..
. . . . ... .. . .
375/200
329/319
4,888,788
12/1989 Teranishi et al. ..
. 375/100
4,901,307
2/1990 Gilhousen et a1.
5,003,553 5,016,257 5,101,416
3/1991 Schluge et a1. 5/1991 Wolfet a1. 311992 Fenton et a1
5,101,417 5,101,501
3/1992 Richley et a1. 3/1992 Gilhousen et a1
370/18 455/33
5,103,459 5,109,390
4/1992 Gilhousen et a1 4/1992 G1lhousen et a1
. 375/200 .. 375/200
5,111,479
5/1992 Akazawa ............................... .. 375/200
370/18 . 375/200 . 375/200 . 375/200
phase angle used during despreading. In further embodiments, the communication signals are despread using appropriate PN codes and separated into in-phase (I) and quadrature channels (Q) where data symbols are processed by fast Hadamard transformers to generate corresponding data bits. The data is formed into pairwise products between the channels and summed over multiple or all active sub scriber orthogonal codes. This sum indicates a degree to
which the estimated phase di?’ers from the actual phase of received communication signals and is used to adjust the phase of application for the PN codes.
26 Claims, 10 Drawing Sheets
DATA DECODEH
RECEIVER 1
1258' RECEIVED DIG ITAL
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1 260' DATA H ECEIVER
54
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5,691,974 Page 2 Us. PAI'ENT‘DOCUMENI‘S 5
056
228’ 5,237,586 5,309,474 5,267,261
I
3
. _
7199 Sch?lmg 3/1993 Bottomley .... .. 11/1993 5/1994 Gilhousen Blakeney 61a]. et a1_ '
5,383,220
1/1995 Murai .................................... .. 375/200
5,200
5,414,728
5/1995 Zehavi .................................. .. 375/200
37 .. 375/200
5,432,521 5 442 627
7/1995 Siwiak et a1. .. 8/1995 Vmhiet 31
".. 375,200 375/200
5,490,165 ' 1
5,311,176
5/1994 Gurney ......... ..
.341/50
5,577,022
5,329,546
7/1994 Lee ....................................... :375/200
5,612,833
2/1996 Blankeney,11 1 et a1. 11/1996 Padovani et a1.
.. 455/121 370/19 370/335 .. 370/335
2/1997 ZBhavi .................................. .. 370/335
U.S. Patent
Nov. 25, 1997
Sheet 1 0f 10
5,691,974
US. Patent
N0v.25, 1997
FIG. 2
5,691,974
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J 184
US. Patent
Nov. 25, 1997
Sheet 7 0110
5,691,974
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US. Patent
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Nov. 25, 1997
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