Apr 20, 2011 - NETWORK. (75) Inventors: ... for identifying co-channel interference in a radio network. In an exemplary
USO0RE43 871E
(19) United States (12) Reissued Patent
(10) Patent Number: US RE43,871 E (45) Date of Reissued Patent: *Dec. 25, 2012
Sanders et al. (54)
(56)
SYSTEM AND METHOD FOR IDENTIFYING CO-CHANNEL INTERFERENCE IN A RADIO NETWORK
References Cited U.S. PATENT DOCUMENTS 5,418,843 A 5/1995 Stjernholm
(75) Inventors: Alan David Sanders, Atlanta, GA (US); Perry Simon Linder LeWars, Chevy Chase, MD (US); Dhaval Dave, Atlanta, GA (US)
5,451,839 A
9/1995 Rappaport et al.
5,506,863 A *
4/1996
5,724,657 A 5,752,164 A
3/1998 Lin et al. 5/1998 Jones
5,802,473 A 5,867,786 A
9/1998 Rutledge et a1. 2/1999 Ishi
(Continued)
(73) Assignee: PCTEL, Inc., Bloomingdale, IL (US) (*)
Notice:
Meidan et al. .............. .. 375/134
This patent is subject to a terminal dis claimer.
FOREIGN PATENT DOCUMENTS W0
WO 01/59936 A2
8/2001
OTHER PUBLICATIONS
(21) Appl. No.: 13/090,772
TSG-RAN Working Group 1, Meeting #4, Yokohama, Japan, Apr.
(22) Filed:
tion.”
19-20, 1999, “Simulation Results for Parallel GSM Synchroniza
Apr. 20, 2011 Related US. Patent Documents
(Continued)
Reissue of:
(64)
Patent No.:
7,301,920
Issued:
Nov. 27, 2007
Appl. No.:
10/694,449
Filed:
Oct. 27, 2003
Primary Examiner * Aj it Patel
(74) Attorney, Agent, or Firm * The Marbury LaW Group, PLLC
(57)
U.S. Applications: (63) Continuation-in-part of application No. 09/638,921,
ABSTRACT
The present invention is directed toWard a system and method for identifying co-channel interference in a radio network. In
(60)
Provisional application No. 60/421,397, ?led on Oct. 25, 2002.
an exemplary method according to the present invention, a ?rst stream of transmission data having a ?rst received signal frequency at a ?rst reception location for a ?rst period of time is received. Further, the ?rst signal frequency of the ?rst
(51)
Int. Cl.
sion data is correlated against a signal template to identify a
?led on Aug. 15, 2000.
stream of transmission data is identi?ed. Then the transmis
H04W4/00 (52) (58)
(2009.01)
US. Cl. ....................... .. 370/328; 370/332; 370/350 Field of Classi?cation Search ................ .. 370/328,
370/329, 332, 333, 341, 337, 347, 350, 431, 370/442, 503; 455/422.1, 5014506
?rst FCCH burst frame. Then, ?rst FCCH time data corre sponding to the ?rst FCCH burst frame is identi?ed and the
signal frequency of the ?rst stream of transmission data and the ?rst FCCH time data is compared to a reference ?le to determine one or more probable transmission cells.
See application ?le for complete search history.
31 Claims, 16 Drawing Sheets
@
205
220
RF Downconverter
215
225
230
Analog! Digital Convener
Memory
210
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Prooesslng Unit (PU)
235 \
Digital Signal Processing
240
Data storage
US RE43,871 E Page 2 US. PATENT DOCUMENTS
2005/0059390 A1* 2006/0153145 A1* * 2007/0161407 A1
3/2005 Sayers et al. ................ .. 455/425 7/2006 Voyer et al. .. 370/335 7/2007 Hovers et a1. ............ .. 455/562.1
5,898,928 A
4/1999 Karlsson et al.
5,909,433 A
6/1999 Haartsen
5,920,597 A 5,926,762 A 5936961 A
7/1999 Khayrallah 7/1999 Arpee et al. 8/1999 Chiodini et a1~
TSG-RAN Working Group 1 (Radio), Meeting #6, Espoo, Finland, Jul. 13-16, 1999, “Complexity Analysis for Parallel GSM Synchro
8/1999 Poon et al.
nization»
5,907,558 A
5,940,380 A 5 970 102 A
’
’
571999 Watanabe
10/1999
Hwang
OTHER PUBLICATIQNS
'
-
-
6,324,382 B1
90000 Watanabe et a1‘ 10/2001 Kunkel
11/2001 Bolder
TSG-RAN Working Group 1, Meeting #7, Aug. 30-Sep. 3, 1999, “ . Hannover, Germany, Method and Algorithm for the GSM Cell Re°°n?Imat1°n~”_ _
6,349,207 B1 6,496,697 B2
2/2002 Monot et 31‘ 12/2002 Jensen
Beijing, China, “CR 25.215-025: Clari?cation of OBserved Time Difference to GSM Cell?’
6,101,383 A
6 122 327 A 6,308,068 B1
6,754,487 B 1 * 6,931,235 B2 *
7,013,113 B2 *
2001/0044322 A1
8/2000
Poon
6/2004 Sanders et a1, ,,,,,,,,,,,,,, H 455/423 8/2005 Kline et a1. .............. .. 455/67.11 3/2006 Dickey ..................... .. 455/67 16
11/2001 Raaf
2003/0026242 A1*
2/2003
2004/0166809 A1*
8/2004 Dickey ..................... .. 455/67.11
TSG-RAN Working Group 1, Meeting #10, Jan. 18-21, 2000,
CommsGlossary.com, de?nition of “Co-Channel Interference,” Jun. 6, 2007, 2Pg$~
NeWton’s Telecom Dictionary, Copyright 2002, de?nition of “Co
Channel Interference,”3pgs.
Jokinen et al. .............. .. 370/350
* cited by examiner
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