USO0RE39927E

(19) United States (12) Reissued Patent

(10) Patent Number: US RE39,927 E (45) Date of Reissued Patent: Nov. 27, 2007

Oshima et a].

(54) COMMUNICATION SYSTEM (75) Inventors: Mitsuaki Oshima, Kyoto (JP); Seiji

FOREIGN PATENT DOCUMENTS CA

2095435

Sakashita, Osaka (JP)

(Continued)

(73) Assignee: Matsushita Electric Industrial Co.,

OTHER PUBLICATIONS

Ltd., Osaka (JP) (21) Appl. No.: 10/783,588

(22)

Filed:

Shinji Matsumoto et al., “200 Mb/s 16 QAM Digital RadioiRelay System Operating in 4 and 5 GHZ Bands”, Japan Telecommunications RevieW, Jan. 1982, vol. 24, No.

Feb. 23, 2004 Related US. Patent Documents

1, pp. 65473.

Reissue of:

(64)

Patent No.:

5,600,672

Issued:

Feb. 4, 1997

Appl. No.:

08/240,521 May 10, 1994

Filed:

(Continued) Primary ExamineriDac V. Ha

(74) Attorney, Agent, or Firmiwenderoth, Lind & Ponack, L.L.P.

U.S. Applications: ( 63)

(30)

Continuation-in-pait of application No. 07/857,627, ?led on

(57)

Mar. 25, 1992, now abandoned.

At the transmitter side, carrier Waves are modulated accord

Foreign Application Priority Data

Mar. 27, 1991

Apr. 25, 1991

.

?rst and second, data streams. The signal points are divided into signal point groups to Which data of the ?rst data stream

Jul. 23, 1991 Mar. 17, 1992

are assigned. Also, data of the second data stream are

assigned to the signal points of each signal point group. A

May 10, 1993 Sep. 24, 1993

difference in the transmission error rate between ?rst and

second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the

Dec. 27, 1993 Mar. 24, 1994

(51) Int. Cl. H04L 5/16

?rst and/or second data streams can be reconstructed from a

received signal. In TV broadcast service, a TV signal is divided by a transmitter into loW and high frequency band

(2006.01)

components Which are designated as ?rst and second data

US. Cl. ..................... .. 375/219; 375/270; 375/301;

streams respectively. Upon receiving the TV signal, a

375/321; 375/261 (58)

ABSTRACT

ing to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, tWo,

(JP) ............................................ .. 3-62798

May 29, 1991

(52)

5/1992

receiver can reproduce only the loW frequency band com ponent or both the loW and high frequency band components, depending on its capability. Furthermore, a

Field of Classi?cation Search ............... .. 375/219,

375/230, 232, 240, 2594262, 265, 270, 321, 375/326, 341, 354; 348/723i726

communication system based on an OFDM system is uti

See application ?le for complete search history. (56)

lized for data transmission of a plurality of subchannels, Wherein the subchannels are differentiated by changing the

References Cited

length of a guard time slot or a carrier Wave interval of a

U.S. PATENT DOCUMENTS 3,824,548 A

symbol transmission time slot, or changing the transmission electric poWer of the carrier.

7/1974 Sullivan et al.

Continued

6 Claims, 178 DraWin g Sheets I 479

f 742

VSB l QAM TRANSMITTER

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144’

DATA SELECTOR 1002

OFFSET ms

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SELECTOR

VALUE

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US RE39,927 E Page 2

US. PATENT DOCUMENTS

3,909,721 A

9/1975 Bussgang et 31.

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4,636,876 A 4,751,478 4,769,819 4,794,447 4,800,426 4,817,192 4,855,692 4,873,701 4,891,806 4,903,125 4,912,706 4,914,655 4,918,437 4,937,844 4,940,954 4,958,360 5,007,088 5,018,198 5,023,889 5,029,003 5,038,219 5,038,402 5,050,188 5,063,445 5,063,452 5,086,340 5,087,975 5,105,442 5,115,453 5,124,852 5,128,758 5,134,464 5,136,380 5,142,353 5,146,335 5,148,422 5,164,963 5,166,924 5,168,509 5,170,413 5,181,112 5,197,061 5,210,770 5,214,656 5,218,436 5,218,622 5,243,629 5,267,021 5,282,019 5,291,289 5,311,547

A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A

A A A A A A 5,999,569 A 6,049,651 A 6,256,357 B1

Judge Forney, Jr~ Lubarsky Armstrong

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Yoshlda Matsutanietal. Tsinberg Glenn Phillips etal. Kennard et al. Tretter Farias et al. Parker Eisenberg et al. Johannes et al. Jasinski et al. Kao Anben et al. sari Ooi etal. Takaliaslii Divsalar etal. Jonnalagadda Yamashita etal. Robbins Dirr NishiZaWa et al. Higurashi Citta etal. Citta etal. Wei Calderbank et al. SuWa etal. Azadegan etal. Basile etal. clio Kageyama etal. Kim etal. Sako et al. Lawrence etal. Moose Nakamura et al. Hess etal. Citta etal. Halben-Lassalle etal. Rice Chung etal. Sugiyama etal. Fazeletal. Wei Raniolianelran etal. Basile etal. Hnlyalkar etal. Wei

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Lane et 31‘ Citta etal. Bestleretal. Oshima Oshima Oshima

Oshima Oshima Oshima

FOREIGN PATENT DOCUMENTS CN CN CN EP EP EP EP EP EP EP EP EP EP EP EP EP EP EP EP EP GB JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP JP

1499725 2627574 1569334 0031193

5/2004 7/2004 1/2005 7/1981

0122805 0311188 0329158 0365431 0392538 0448492 0485105 0485108 0490552 0506400 0525641 0531046 0540231

10/1984 4/1989 8/1989 4/1990 10/1990 9/1991 5/1992 5/1992 6/1992 9/1992 2/1993 3/1993 5/1993

A1

A2

A2 A2 A2

0282298 1528854 1529838

9/1998 5/2005 5/2005

2 187 611 53-108215

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62-502932 53-137657 57-39629 58107740

11/1978 12/1978 3/1982 6/1983 9/1983 9/1983 4/1986 6/1987 2/1988 7/1988 7/1988 10/1988 1/1989 3/1989 3/1989 4/1990 5/1990 6/1990 6/1990 8/1990 8/1990 10/1990 1/1991 3/1991 3/1991 7/1992 11/1992

58161427 58161547 61-70861 62-133842 63-28145 63-180222 63-180280 63253738 64-5135 64-68144 64-74836 2-94814 2-141049 2-154583 2-166979 2-195732 2-218279 2-260726 3-13145 3-48587 3-69295 04196822 4-322592

US RE39,927 E Page 3

JP JP JP JP JP JP UA WO WO WO WO WO WO

5-75568 5-167633 5-218978 7-79415 7-99522 2004-159207 52118 85/04541 86-07223 89/08366 91-20137 92/14343 92-22162

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7575.

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6, Jun. 1978, pp. 8724881.

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