公开(公告)号：JP2001358694A

公开(公告)日：2001-12-26

申请号：JP2001116607

申请日：2001-04-16

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAROIA RAJIV ,  LI JUNYI ,  RANGAN SUNDEEP ,  VISWANATH PRAMOD

IPC: H04B1/713 ,  H04B1/7143 ,  H04B1/7156 ,  H04B7/26 ,  H04J11/00 ,  H04L5/02 ,  H04L27/26 ,  H04J13/00

Abstract: PROBLEM TO BE SOLVED: To enable a mobile user device to seedily discriminate and synchronize with a downlink of the base station sending the intensest signal through an orthogonal frequency-division multiplex(OFDM) system, based upon a spread- spectrum multiple access(SSMA) system. SOLUTION: The base station discrimination is actualized by finding the gradient of the most intense received pilot signal (having maximum energy). A pilot tone hopping series is based upon a Latin square series. With the pilot tone hopping series based upon Latin square, the need that the mobile user device has in only for determining the frequency of a pilot tone at a certain time. The gradient and initial frequency shift of the pilot tone hopping series having the highest reception power are determined, by using a natural maximum energy detector. The natural gradient of the pilot hopping series is used to discriminate the base station having the most intense down-link signal.

公开(公告)号：AU3517501A

公开(公告)日：2001-10-25

申请号：AU3517501

申请日：2001-04-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAROIA RAJIV ,  VISWANATH PRAMOD ,  RANGAN SUNDEEP ,  LI JUNYI

IPC: H04B1/713 ,  H04B1/7143 ,  H04B1/7156 ,  H04B7/26 ,  H04J11/00 ,  H04L5/02 ,  H04L27/26 ,  H04J13/02 ,  H04B7/216 ,  H04L5/00 ,  H04J13/06

Abstract: A base station having the strongest downlink signal is identified by utilizing a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence is based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at one time because the pilot tone locations at subsequent times can be determined from the slope of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted set of pilot tone locations having the maximum received energy. In another embodiment, the frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times "t". These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.

公开(公告)号：CA2338471C

公开(公告)日：2006-11-07

申请号：CA2338471

申请日：2001-02-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： VISWANATH PRAMOD ,  RANGAN SUNDEEP ,  LI JUNYI ,  LAROIA RAJIV

IPC: H04B1/713 ,  H04J11/00 ,  H04B1/7143 ,  H04B1/7156 ,  H04B1/76 ,  H04B7/26 ,  H04L5/02 ,  H04L27/26 ,  H04Q7/36

Abstract: A base station having the strongest downlink signal is identified by utilizi ng a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slo pe of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence i s based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at on e time because the pilot tone locations at subsequent times can be determined from the slop e of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted s et of pilot tone locations having the maximum received energy. In another embodiment, th e frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times "t". These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.

公开(公告)号：BR0101426A

公开(公告)日：2001-11-13

申请号：BR0101426

申请日：2001-04-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAROIA RAJIV ,  RANGAN DEEP ,  LI JUNYI ,  VISWANATH PRAMOD

IPC: H04B1/713 ,  H04B1/7143 ,  H04B1/7156 ,  H04B7/26 ,  H04J11/00 ,  H04L5/02 ,  H04L27/26 ,  H04Q7/22

Abstract: A base station having the strongest downlink signal is identified by utilizing a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence is based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at one time because the pilot tone locations at subsequent times can be determined from the slope of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted set of pilot tone locations having the maximum received energy. In another embodiment, the frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times "t". These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.

公开(公告)号：CA2338471A1

公开(公告)日：2001-10-18

申请号：CA2338471

申请日：2001-02-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： VISWANATH PRAMOD ,  RANGAN SUNDEEP ,  LI JUNYI ,  LAROIA RAJIV

IPC: H04B1/713 ,  H04B1/7143 ,  H04B1/7156 ,  H04B7/26 ,  H04J11/00 ,  H04L5/02 ,  H04L27/26 ,  H04Q7/36 ,  H04B1/76

Abstract: A base station having the strongest downlink signal is identified by utilizi ng a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slo pe of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence i s based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at on e time because the pilot tone locations at subsequent times can be determined from the slop e of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted s et of pilot tone locations having the maximum received energy. In another embodiment, th e frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times "t". These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.