公开(公告)号：CA2302491A1

公开(公告)日：1999-03-11

申请号：CA2302491

申请日：1998-07-17

Applicant: MOTOROLA INC

Inventor： ROHANI KAMYAR ,  ROZANSKI WALTER J JR ,  KOTZIN MICHAEL D

IPC: H04L27/20 ,  H04B7/005 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L1/02 ,  H04B1/69 ,  H04B7/02

Abstract: Orthogonal transmit diversity is implemented by employing a data splitter(803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaver (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

公开(公告)号：DE19680642T1

公开(公告)日：1997-12-04

申请号：DE19680642

申请日：1996-05-10

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  ROHANI KAMYAR

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W48/06 ,  H04B7/216 ,  H04J13/04 ,  H04Q7/20

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：CA2103201A1

公开(公告)日：1994-06-04

申请号：CA2103201

申请日：1993-11-16

Applicant: MOTOROLA INC

Inventor： ROHANI KAMYAR ,  GHOSH AMITAVA ,  HARRISON R MARK

IPC: H04B7/005 ,  H04L25/02 ,  H04B7/02

Abstract: Each of a plurality of transmitters (31-37) transmits (62) one of a plurality of known signals. The known signals being known to a receiver (40). The receiver (40) then measures the known signals (63); and using those measurements, estimates the plurality of channel responses (64). The channel responses are then used to determine a power ratio parameter (65) and a phase correction parameter (66).

公开(公告)号：DE60331829D1

公开(公告)日：2010-05-06

申请号：DE60331829

申请日：2003-05-05

Applicant: MOTOROLA INC

Inventor： AHMED MANSOOR ,  ROHANI KAMYAR ,  LAIRD KEVIN M

IPC: H04J3/24 ,  H04L1/16 ,  H04B7/26 ,  H04L1/00 ,  H04L1/18 ,  H04L29/08 ,  H04Q7/38

Abstract: A method 600 of selecting an ARQ method for retransmitting a data frame based on an accumulated signal to noise ratio (SNR) of systematic bits in the data frame at a receiving unit 508. The sending unit 500 tracks the accumulated SNR of systematic bits by using channel SNR measurement reports sent by the receiving unit 508. The method utilizes Chase combining of re-transmitted systematic bits (via Partial incremental redundancy transmissions) until the accumulated SNR of the systematic bits has reached a suitable value, and then switches to sending only parity bits (via Full incremental redundancy) in retransmissions. In addition, the method alters the allocation of resources, such as code power, to provide only that necessary for successful decoding of the transmitted frame. The sending unit 500 informs the receiving unit 508 of the type of transmission, number of the transmission and/or resource allocation associated with the data frame.

公开(公告)号：CA2302491C

公开(公告)日：2005-12-06

申请号：CA2302491

申请日：1998-07-17

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  ROHANI KAMYAR ,  ROZANSKI WALTER J JR

IPC: H04L27/20 ,  H04B7/005 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L1/02 ,  H04B1/69 ,  H04B7/02

Abstract: Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each porti on is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number o f bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaves (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

公开(公告)号：CA2336947C

公开(公告)日：2004-02-24

申请号：CA2336947

申请日：1999-06-22

Applicant: MOTOROLA INC

Inventor： AHMED MANSOOR ,  ROHANI KAMYAR

IPC: H04B7/26 ,  H04B7/005 ,  H04B1/00

Abstract: In a transceiver in a wireless communications system, data is transmitted fr om the transceiver to subscriber units, wherein each subscriber unit has a requested transmit power and an allocated transmit power, and wherein the allocated transmit power is based upon the requested transmit power. A request for an additional power allocation (200) is detected, wherein such additional allocation causes a total requested power to exceed a maximum transceiver power (220). In response, allocated transmit power is limited for a minimum number of selected subscriber units (222) needed to reduce a total transceiver transmi t power below the maximum transceiver power (220).

公开(公告)号：AU1579601A

公开(公告)日：2001-05-30

申请号：AU1579601

申请日：2000-11-01

Applicant: MOTOROLA INC

Inventor： AIRY MANISH ,  ROHANI KAMYAR

IPC: H04B7/005 ,  H04B7/26

Abstract: A method for providing fast power control to mobile stations simultaneously initiating a random access transmission to a base station in a communication system is disclosed. The mobile station does not wait for an acknowledgement of successful detection prior to transmitting the header/message portion of the access Message and responding to power control bits on the associated F-PCCH sub-channel. The mobile will, however, abort transmission if no detection acknowledgement is received on a forward common channel within a predetermined timeout. If the base station detects an access preamble in any R-RACH slot, it starts a power control bit stream on the associated F-PCCH sub-channel.

公开(公告)号：DE19882841T1

公开(公告)日：2001-03-22

申请号：DE19882841

申请日：1998-10-27

Applicant: MOTOROLA INC

Inventor： ROHANI KAMYAR

IPC: H04B17/00 ,  H04W36/30 ,  H04W36/32 ,  H04B7/00

Abstract: A CDMA communication system (400) includes a plurality of base stations (410, 420 and 430) transmitting at least a corresponding plurality of pilot signals. A mobile station (401) in a coverage area of the system (400) receives at least one of the plurality of pilot signals and transmits a Pilot Strength Measurement Message that includes a Neighbor Set of a list of a plurality of candidate pilots for a and-off routine. A method and apparatus for determining the Neighbor Set includes finding a location of the mobile station (401) in the coverage area of system (400) and determining the list of plurality of candidate pilots in the Neighbor Set according to the location of the mobile station (401).

公开(公告)号：BR9814746A

公开(公告)日：2000-10-03

申请号：BR9814746

申请日：1998-10-27

Applicant: MOTOROLA INC

Inventor： ROHANI KAMYAR

IPC: H04W16/24 ,  H04W36/06 ,  H04W36/26 ,  H04W36/30 ,  H04Q7/00

Abstract: A communication system provides wireless communication in a coverage area and includes a base station (100) and a mobile station (290). The base station (100) has a plurality of sectors (210, 220, 230, 240, 250, 260) where a corresponding plurality of pilot signals (212, 222, 232, 242, 252, 262) are transmitted. A sector (210) transmits a forward link signal (211) for communicating to the mobile station (290). The mobile station (290) transmits a reverse link signal (215) and a message signal including a list of a plurality of candidate sectors for a soft hand-off routine. A method and apparatus of determining the candidate list includes measuring reverse link signal (215) which are received at said plurality of sectors. Then, comparing reverse link signal level received at sector (210) to the reverse link signal levels received at all other sectors of said plurality of sectors (210, 220, 230, 240, 250, 260). Finally, the candidate list is determined according to a result of comparing the reverse link signal levels.

公开(公告)号：AU2871000A

公开(公告)日：2000-09-14

申请号：AU2871000

申请日：2000-02-04

Applicant: MOTOROLA INC

Inventor： WHINNETT NICHOLAS WILLIAM ,  CLOP OSCAR ,  BOIXADERA FRANCESC ,  KUCHI KIRAN KUMAR ,  ROHANI KAMYAR

IPC: H04B7/06

Abstract: In a method for wireless data communication between a base station and a subscriber unit in a wireless communication system, groups of symbols of an input data stream are commutated to produce a plurality of commutated data streams. The plurality of commutated data streams are then transformed to produce a plurality of transformed data streams. Next, each transformed data stream is spread with a selected one of a plurality of spreading codes to produce a plurality of antenna signals. Finally, each of the plurality of antenna signals is transmitted using a selected one of a plurality of spaced apart antennas, wherein the plurality of spaced apart antennas are spaced apart to provide transmit diversity. In one embodiment, the transform is a space-time transform.