公开(公告)号：JP2001127674A

公开(公告)日：2001-05-11

申请号：JP2000270156

申请日：2000-09-06

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LI QUINN ,  ALLPRESS STEPHEN A ,  BUEHRER MICHAEL R ,  NAREPIRI S RAMESHU ,  SONI ROBERT ATMARAM

IPC: H04B1/04 ,  H04B7/02 ,  H04B7/04 ,  H04B7/06 ,  H04J3/00 ,  H04L1/06

Abstract: PROBLEM TO BE SOLVED: To realize common transmitter architecture which can be simply installed and which has an orthogonal transmit diversity(OTD) system and a space time spreading(STS) system. SOLUTION: The transmitter 10 has an OTD mode and an STD mode and 1st and 2nd antenna systems. The 1st antenna system 11 has a time multiplexer 12, an inerter 14, switches 16, 26, amplifiers 18, 20, a mixer 22 and an adder 24. The time multiplexer 12 applies time multiplexing to 1st in-phase signals with each other, 1st orthogonal signals with each other, a 2nd in-phase signal and its inverse, and a 2nd orthogonal signal and its inverse, respectively. The mixer 22 mixes the output of the time multiplexer 12 with a Walsh function. The result is fed to the adder 24. Only when the transmitter 10 is set to the STS mode, the switch 26 sends 3rd and 4th mixed time multiplex signals to the adder.

公开(公告)号：JPH10107692A

公开(公告)日：1998-04-24

申请号：JP24705697

申请日：1997-09-11

Applicant: LUCENT TECHNOLOGIES INC

Inventor： NAREPIRI S RAMESHU

IPC: H04L27/20 ,  H04J11/00 ,  H04J13/00 ,  H04L5/12 ,  H04B1/707

Abstract: PROBLEM TO BE SOLVED: To obtain such a solution with which IS-95 technology is compatible with the existing IS-95 infrastructure by combining several modulated signals which orthogonally exist in a single carrier frequency band for the purpose of transmission. SOLUTION: Modulated signals which are generated by each broadband unit 303 is compensated for crossing at right angles an IS-95 signal which is modulated and spread by a corresponding IS-95 signal generator 102 in relation to the same carrier frequency band by using a version of a QPSK modulation system related to a broadband data stream. A broadband signal sent from the unit 303 is combined with a narrowband signal sent from the generator 102 by a combiner 304. A combined signal acquired in this way is processed by a RF circuit 306 and sent to various remote cellular units by an antenna 308.

公开(公告)号：JP2001086045A

公开(公告)日：2001-03-30

申请号：JP2000239398

申请日：2000-08-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LI QUINN ,  NAREPIRI S RAMESHU

IPC: H04B1/707 ,  H04B7/02 ,  H04B7/06 ,  H04B7/12 ,  H04J11/00 ,  H04J13/18 ,  H04L1/00 ,  H04L1/04 ,  H04L1/06

Abstract: PROBLEM TO BE SOLVED: To improve the transmitting diversity of wireless communication by using the orthogonality of both encoding and carrier frequency. SOLUTION: A demultiplexer 84 divides the input data received from an interleaver 82 into parallel channel paths of six pieces of output 86, 88, 90, 92, 94 and 96 and sends them to multipliers 98, 100, 102, 104, 106 and 108 respectively. The multipliers 89, 102 and 106 encode the received outputs by means of a Walsh code Wn1, and the multipliers 100, 104 and 108 encode the received outputs by means of a Walsh code Wn2 that is orthogonal to the code Wn1. The output 110, 112 and 114 and 116, 118 and 120 are sent to the multipliers 130, 132, 134, 136, 138 and 140 respectively as orthogonal data. The signal paths are encoded by a pseudo random code that is used for the CDMA communication and sent to the RF sections 154-164, and the carriers of frequency f1, f2 and f3 are modulated by the orthogonal pairs of data respectively. Then the in-phase data are added together by adders 180 and 184 and transmitted with diversity via antennas 182 and 186.

公开(公告)号：JPH10107691A

公开(公告)日：1998-04-24

申请号：JP24705597

申请日：1997-09-11

Applicant: LUCENT TECHNOLOGIES INC

Inventor： STEPHEN ALAN OORUPURESU ,  NAREPIRI S RAMESHU

IPC: H04L27/20 ,  H04B1/69 ,  H04L5/02 ,  H04B1/707

Abstract: PROBLEM TO BE SOLVED: To obtain such a solution with which IS-95 technology is compatible with the existing IS-95 infrastructure by combining modulated signals comprising entire information of data streams to send as a multi band signal. SOLUTION: Encoded data streams which are generated by a broadband signal generator 302 related to each broadband data stream are modulated and spread over the same number M carrier frequencies which are used by M IS-95 signal generators 102. A broadband signal is encoded by using a QPSK function that is designed that a broadband signal related to each data stream crosses both a broadband signal related to the rest of broadband data streams and a narrowband signal related with all IS-95 users at right angles, so that a broadband signal may not interfere with a narrowband IS-95 signal. A QPSK spectrum spread modulation system of each broadband unit 303 insures the orthogonality.