公开(公告)号：DE60035291D1

公开(公告)日：2007-08-02

申请号：DE60035291

申请日：2000-12-28

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  CLASSON BRIAN K ,  JALLOUL LOUAY A ,  CUDAK MARK C

IPC: H04J3/00 ,  H04L1/18 ,  H04Q7/28

Abstract: A method in a communication system ( 100 ) includes transmitting from a source user ( 101 ) a first data packet ( 111 ) over a first time frame ( 121 ) having a finite time period ( 131 ), transmitting from source user ( 101 ) a second data packet ( 112 ) over a second time frame ( 122 ) immediately subsequent to first time frame ( 121 ), detecting an acknowledgment of acceptable reception of data packet associated with either first or said second data packets ( 111 and 112 ), repeating transmission of first and second data packets ( 111 and 112 ) in a sequence of first and second time frames ( 121 and 122 ) in a time frame sequence ( 190 ) until the detection.

公开(公告)号：BRPI0600341A

公开(公告)日：2007-03-06

申请号：BRPI0600341

申请日：2006-02-08

Applicant: MOTOROLA INC

Inventor： WANG FAN ,  GHOSH AMITAVA ,  SANKARAN CHANDRASEKAR ,  TAN JUN

IPC: H04B1/707 ,  H04K1/10 ,  H04L7/00

Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain. Application to a hybrid OFDM-CDMA system where spreading is performed in the time domain.

公开(公告)号：DE60124293T2

公开(公告)日：2007-02-15

申请号：DE60124293

申请日：2001-10-09

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  JALLOUL LOUAY

IPC: H04L1/18 ,  H04W28/04 ,  H04W36/18

Abstract: A method of combining soft-handoff with a hybrid ARQ scheme to maximize throughput and gain in a communications system. After receiving a frame from the MS (110), the BTSs (104 and 106) will process the frame and communicate to the MS over a forward control channel whether the frame contained any errors. If all BTSs communicate that the frame contains errors, the MS will retransmit the same frame to all BTSs with a flush bit set to instruct the BTSs 104 and 106 to combine the retransmitted frame with the original frame. If only some BTSs communicate that the frame contains errors, the MS will transmit the next frame to all BTSs that successfully decoded the frame with the flush bit set to instruct the BTSs to erase the previous frame from memory and not to combine the previous frame with the current frame. The MS will retransmit the frame to the BTSs that did not successfully decode the frame with the flush bit set to instruct the BTSs to combine the previous frame with the retransmitted frame.

公开(公告)号：CA2533360A1

公开(公告)日：2006-08-09

申请号：CA2533360

申请日：2006-01-20

Applicant: MOTOROLA INC

Inventor： WANG FAN ,  GHOSH AMITAVA ,  SANKARAN CHANDRASEKAR ,  TAN JUN

IPC: H04J13/00

Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.

公开(公告)号：BRPI0409140A

公开(公告)日：2006-03-28

申请号：BRPI0409140

申请日：2004-03-29

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT T ,  GHOSH AMITAVA ,  KUCHIBHOTLA RAVI

IPC: H04L12/56 ,  H04W56/00 ,  H04W72/04 ,  H04W72/08 ,  H04W72/12 ,  H04W84/04 ,  H04Q7/38

Abstract: The present invention provides a method of scheduling asynchronous transmissions for a plurality of subscriber units. The method includes receiving information associated with a plurality of subscriber units that have uplink data to transmit, the information including uplink timing offset information associated with each of the subscriber units. Two or more subscriber units are then selected from a set of subscriber units having a timing offset differential, that is below a predetermined threshold, where the timing offset differential is the difference between the timing offset of a first subscriber unit and the timing offset of a second subscriber unit further selectively offset by a multiple of the transmission segment size, which minimizes the difference. The transmission segments, which are available for the uplink of data, are then allocated between the selected two or more subscriber units, which limits the number of transmission segments that have at least one of an overlap or a gap, and the amount of any overlap or gap, in order to minimize wasted scheduling opportunities.

公开(公告)号：GB2391753B

公开(公告)日：2006-01-11

申请号：GB0218413

申请日：2002-08-08

Applicant: MOTOROLA INC

Inventor： WHINNETT NICHOLAS ,  GHOSH AMITAVA

IPC: H04B7/005

公开(公告)号：CA2373835C

公开(公告)日：2005-05-17

申请号：CA2373835

申请日：2001-03-12

Applicant: MOTOROLA INC

Inventor： CLASSON BRIAN K ,  GHOSH AMITAVA ,  CUDAK MARK ,  LOVE ROBERT T ,  JALLOUL LOUAY ,  NIKIDES ROBERT S

IPC: H04J3/00 ,  H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L12/28 ,  H04L12/56 ,  H04W16/14 ,  H04W28/14 ,  H04W36/08 ,  H04W36/18 ,  H04W36/30 ,  H04W36/38 ,  H04W48/20 ,  H04W72/12 ,  H04Q7/36 ,  H04J3/16 ,  H04B7/216 ,  H04Q7/38 ,  H04B1/69

Abstract: A mobile station (402) selects (1802) a preferred cell site for transmitting a frame of data to be sent subsequently to the mobile station. A base station (602) of the preferred cell site schedules (1804) a transmission of the fram e of data, wherein parameters for the transmission are determined by the base station from recently-measured channel and interference information. Thereafter, the base station sends (1806) the frame of data from the preferr ed cell site; and an active set of base stations associated with the mobile station at ones of a plurality of cell sites synchronize (1808) their data queues to reflect the transmission of the frame of data.

公开(公告)号：GB2381715B

公开(公告)日：2004-10-20

申请号：GB0217441

申请日：2002-07-29

Applicant: MOTOROLA INC

Inventor： FRANK COLIN D ,  VISOTSKY EUGENE ,  CHOUDHARY PRASHANT ,  GHOSH AMITAVA

IPC: H04B1/7105 ,  H04B1/7107 ,  H04L25/03 ,  H04B1/707

Abstract: The present invention provides linear MMSE equalization with parallel interference cancellation for symbol determination in a forward link of a CDMA communication system which has a plurality of code channels in use. Use of the linear MMSE equalization with parallel interference cancellation of the present invention provides significantly increased performance. The preferred method linearly filters a received signal to form a first filtered signal ( 410 ), despreads and demodulates the first filtered signal ( 415, 420 ) and provides a plurality of symbol estimates for all corresponding code channels ( 430 ). An estimated transmitted signal is generated from the plurality of symbol estimates ( 435 ), and with a channel estimate ( 405 ), an estimated received signal is generated ( 440 ). A residual signal is determined as a difference between the received signal and the estimated received signal, is linearly filtered ( 445 ), and then combined with the estimated transmitted signal to form a next, enhanced estimated transmitted signal ( 450 ). This next estimated transmitted signal is despread ( 455, 460 ) and utilized to provide a next plurality of symbol estimates, for a selected code channel of the plurality of channels, for subsequent use in error correction and decoding, and further use by a subscriber ( 465, 475 ).

公开(公告)号：SE517615C2

公开(公告)日：2002-06-25

申请号：SE9700287

申请日：1997-01-31

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  ROHANI KAMYAR

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W48/06 ,  H04Q7/32

Abstract: A transmitter transmits the desired signal using a continuous duty cycle at transmission rates of less than full rate (FIG. 6 ). The energy used in each power control group is related to the transmission rate. By repeating the power control groups, time division diversity (FIG. 6 ) is provided. In the receiver, the received power control groups are analyzed and compared to several levels of energy thresholds (73, 75, 77, 79). The results of the comparisons are converted into a power control signal (74, 76, 78, 80, 81) and returned to the mobile. The mobiles are capable of selecting the appropriate bit (93) and adjusting their power (94). Alternatively, an indicator of the transmission rate can be forwarded (155) in advance of the frame. The receiver compares a power estimate with the threshold for the transmission rate indicated (166).

公开(公告)号：BR9916802A

公开(公告)日：2002-03-26

申请号：BR9916802

申请日：1999-12-28

Applicant: MOTOROLA INC

Inventor： CUDAK MARK C ,  GHOSH AMITAVA

IPC: H04B1/707 ,  H04B7/26 ,  H04J3/06 ,  H04J11/00 ,  H04L1/00 ,  H04Q7/38 ,  H04B15/00

Abstract: Remote units (113) having large amounts of data to transmit will be dynamically assigned Orthogonal Variable Spreading Factor (OVSF) codes corresponding to higher data rates and remote units (113) with lower amounts of data to be transmitted will be assigned OVSF codes corresponding to lower data rates. The reduction of the data rate between the base station (100) and remote units (113) occurs by changing the current OVSF codes utilized by both the remote units (113) and the base station (100). In order to eliminate collisions among remote units transmitting data, a remote units transmission is advanced and retarded in time based on an amount of offset from a frame boundary.