公开(公告)号：FR2736228B1

公开(公告)日：2004-07-16

申请号：FR9607615

申请日：1996-06-19

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  ROHANI KAMYAR

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W48/06 ,  H04B7/216

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：CA2503821A1

公开(公告)日：2004-05-21

申请号：CA2503821

申请日：2003-10-30

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  STEWART KENNETH A ,  LOVE ROBERT T

IPC: H04B7/00 ,  H04J11/00 ,  H04W28/04 ,  H04W72/08 ,  H04W72/12 ,  H04J3/24

Abstract: A communication system (300, 1000) supports Hybrid Automatic Repeat Request (H- ARQ), Adaptive Modulation and Coding (AMC), active set handoff, and scheduli ng functions in a distributed fashion by allowing a mobile station (MS) (1014) to signal control information corresponding to an enhanced reverse link transmission to Active Set base transceiver stations (BTSs) (301, 303, 304) and by allowing the BTSs to perform control functions (314, 316, 318) that were supported by an radio network controller (RNC) in the prior art. The communication system allows time and SIR-based H-ARQ flush functions at the BTSs during soft handoff (SHO), provides a control channel structure to support scheduling, H-ARQ, AMC functions for an enhanced reverse link, or uplink, channel (414) in order to maximize throughput, and enables an MS in a SHO region to choose a scheduling assignment corresponding to a best TFRI ou t of multiple assignments it receives from multiple active set BTSs.

公开(公告)号：AU2003242548A1

公开(公告)日：2004-03-11

申请号：AU2003242548

申请日：2003-05-19

Applicant: MOTOROLA INC

Inventor： WHINNET NICHOLAS ,  GHOSH AMITAVA

IPC: H04B7/005 ,  H04W36/18 ,  H04W52/14 ,  H04W52/28 ,  H04W52/40 ,  H04W88/08 ,  G06F9/445 ,  H04Q7/32

公开(公告)号：GB2391753A

公开(公告)日：2004-02-11

申请号：GB0218413

申请日：2002-08-08

Applicant: MOTOROLA INC

Inventor： WHINNETT NICHOLAS ,  GHOSH AMITAVA

IPC: H04B7/005

Abstract: A communication unit 201 comprises a first subsystem 217 with a first receive processor 221 determining a control value according to a first algorithm. A second subsystem 219 has a second receive processor 227 for determining a second control value according to a second algorithm, and a third receive processor 219 determining a third control value according to the first algorithm. The third control value corresponds to the first control value, and is preferably identical to this. The communication unit 201, further comprises a combiner 225, 229 combining the first, second and third power control values into a fourth control value such that the contribution from the third control value reduces the contribution from the first power control value. Preferably, the third control value substantially cancels out the first control value. The communication unit 201 further comprises a transmit unit 211 for transmitting the control signal comprising the fourth control value to at least a second communication unit.

公开(公告)号：GB2381715A

公开(公告)日：2003-05-07

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 Figure 4B). This next estimated transmitted signal is despread (455, 460 Figure 4B) 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 Figure 4B).

公开(公告)号：SE517676C2

公开(公告)日：2002-07-02

申请号：SE9604432

申请日：1996-12-02

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  REED JOHN DOUGLAS ,  ROZANSKI JR WALTER JOSEPH ,  BUFORD KEVIN ANDREW

IPC: G01S5/14 ,  H04W36/32 ,  G01S19/09 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  H04Q7/38

Abstract: A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.

公开(公告)号：BR0104050A

公开(公告)日：2001-12-18

申请号：BR0104050

申请日：2001-01-05

Applicant: MOTOROLA INC

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

IPC: H04L1/00 ,  H04W16/14 ,  H04W28/22 ,  H04B1/00

Abstract: A mobile station (110) selects an initial data rate for communication between base station (107) and mobile station (110). Mobile station (110) communicates the selected initial data rate to base station (107) through uplink (112). Base station (107) determines a difference level of interference condition experienced by mobile station (107) between a time when the initial data rate was selected by mobile station (110) and a time when base station (107) prepares to communicate to mobile station (110). Base station (107) selects a final data rate for transmission from base station (107) to mobile station (110) based on the determined difference level of interference condition. As such, the initial data rate may be modified to the final data rate while maximizing the down link capacity.

公开(公告)号：CA2373835A1

公开(公告)日：2001-09-27

申请号：CA2373835

申请日：2001-03-12

Applicant: MOTOROLA INC

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

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：CA2365634A1

公开(公告)日：2001-08-02

申请号：CA2365634

申请日：2001-01-05

Applicant: MOTOROLA INC

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

IPC: H04L1/00 ,  H04W16/14 ,  H04W28/22 ,  H04B1/00

Abstract: A mobile station (110) selects an initial data rate for communication betwee n base station (107) and mobile station (110). Mobile station (110) communicat es the selected initial data rate to base station (107) through uplink (112). Base station (107) determines a difference level of interference condition experienced by mobile station (107) between a time when the initial data rat e was selected by mobile station (110) and a time when base station (107) prepares to communicate to mobile station (110). Base station (107) selects a final data rate for transmission from base station (107) to mobile station (110) based on the determined difference level of interference condition. As such, the initial data rate may be modified to the final data rate while maximizing the down link capacity.

公开(公告)号：CA2391623A1

公开(公告)日：2001-05-25

申请号：CA2391623

申请日：2000-11-02

Applicant: MOTOROLA INC

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

IPC: H03M13/29 ,  H03M13/35 ,  H04L1/00 ,  H04L1/02 ,  H04L1/18 ,  H04L29/08 ,  H04L1/22

Abstract: A generic structure of Hybrid ARQ using Turbo Codes is provided which requir es the function of channel coding, redundancy selection, buffering and maximum- ratio diversity combining, channel decoding, error detection, and sending ba ck an acknowledgement to the transmitter (Fig.3). The functions of channel codi ng and redundancy selection (Fig.1) are performed at the transmitter while the remaining functions are performed at the receiver. The initial code rate can be explicitly communicated to the receiver or blindly detected.