Ahmed Aldiba Saifuddin

US Patent:

6603752, Aug 5, 2003

Filed:

Jul 29, 1999

Appl. No.:

09/363545

Inventors:

Ahmed Saifuddin - San Diego CA 92121
Sandip Sarkar - San Diego CA 92126

International Classification:

H04B 7216

US Classification:

370335, 370342, 455522

Abstract:

Controlling transmission energy in a variable rate communication system that gates out portions of a frame in a predetermined and predicable fashion. In particular, the present invention describes a method and apparatus which identifies closed loop power control commands that have been generated erroneously based on portions of a frame that have been gated. The identified power control commands are ignored. In an alternative embodiment, if identification of the erroneous power control commands occurs after response measures have been taken, the transmitting station responds by setting the transmission energy back to the state it would have been in had the erroneous power control commands been identified prior to the response.

US Patent:

6801759, Oct 5, 2004

Filed:

Sep 25, 2000

Appl. No.:

09/670292

Inventors:

Ahmed Saifuddin - San Diego CA

Assignee:

Qualcomm, Incorporated - San Diego CA

International Classification:

H04B 100

US Classification:

455127, 455 69, 4552261, 455522, 370342, 370345

Abstract:

In a wireless communication system a method for power control in a mobile unit, wherein a variable size step is used to adjust the transmit power. The method compares a current power control signal to a previous one, and incrementally changing the step size for no change The adjusted step size is compared to maximum and minimum values to maintain a predetermined step size range. In one embodiment, a mobile unit includes a memory storage device and a comparator for storing the power control signals and comparing them.

US Patent:

6898193, May 24, 2005

Filed:

Jun 20, 2002

Appl. No.:

10/177132

Inventors:

Ahmed Saifuddin - San Diego CA, US

Assignee:

Qualcomm, Incorporated - San Diego CA

International Classification:

H04L012/26
H04J001/16
G08C015/00
G06F011/00
G01R031/08

US Classification:

370326, 370252, 370333, 370335, 455 69, 455522

Abstract:

Systems and techniques are disclosed relating to telecommunications which include transmitting a plurality of data groups to a receiver at a first power level, retransmitting a first one of the data groups to the receiver at a second power level lower than the first power level, providing feedback from the receiver relating to the retransmission of the first one of the data groups, and retransmitting a second one of the data groups to the receiver at a third power level different from the second power level, the third power level being a function of the feedback. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

US Patent:

6999430, Feb 14, 2006

Filed:

Nov 30, 2000

Appl. No.:

09/727925

Inventors:

Jack M. Holtzman - San Diego CA, US
Sandip Sarkar - San Diego CA, US
Ahmed Saifuddin - San Diego CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04L 12/26
H04L 1/00
H04J 1/16
G06F 11/00
G08C 15/00

US Classification:

370328, 370230, 370474, 375260, 455441

Abstract:

Methods and apparatus are presented for scheduling data packet transmissions during optimal channel conditions. In one method, data packet retransmissions are scheduled for transmission during favorable channel conditions when the target remote station is moving slowly, but are scheduled for periodic transmissions when the target is moving moderately or fast. In another method, long delays for retransmissions in a channel sensitive timing scheme are eliminated. In other methods, a combination of periodic and aperiodic retransmissions are used to achieve the desired frame error rate.

US Patent:

7159164, Jan 2, 2007

Filed:

Jun 5, 2000

Appl. No.:

09/588072

Inventors:

Ahmed Saifuddin - San Diego CA, US
Joseph P. Odenwalder - Del Mar CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03M 13/00

US Classification:

714755, 714756, 714776

Abstract:

A method and an apparatus for recovery of particular bits in a frame are disclosed. An origination station forms a frame structure with groups of information bits of different importance. All the information bits are then protected by an outer quality metric. Additionally, the groups of more important information bits are further protected by an inner quality metric; each group having a corresponding quality metric. The frame is then transmitted to a destination station. The destination station decodes the received frame and decides, first in accordance with the outer quality metric, whether the frame has been correctly received, or whether the frame is erased. If the frame has been declared erased, the destination station attempts to recover the groups of more important information bits in accordance with the corresponding inner quality metrics.

US Patent:

7573853, Aug 11, 2009

Filed:

Apr 10, 2003

Appl. No.:

10/411968

Inventors:

Ahmed Saifuddin - San Diego CA, US
Sandip Sarkar - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 7/216

US Classification:

370335, 370342, 455522

Abstract:

Controlling transmission energy in a variable rate communication system that gates out portions of a frame in a predetermined and predicable fashion. In particular, the present invention describes a method and apparatus which identifies closed loop power control commands that have been generated erroneously based on portions of a frame that have been gated. The identified power control commands are ignored. In an alternative embodiment, if identification of the erroneous power control commands occurs after response measures have been taken, the transmitting station responds by setting the transmission energy back to the state it would have been in had the erroneous power control commands been identified prior to the response.

US Patent:

7706321, Apr 27, 2010

Filed:

Oct 12, 2004

Appl. No.:

10/964103

Inventors:

Ahmed Saifuddin - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 12/26
H04J 1/16
G08C 15/00
G06F 11/00
G01R 31/08

US Classification:

370328, 370335, 370342, 370252, 455 69, 455522

Abstract:

Systems and techniques are disclosed relating to telecommunications which include transmitting a plurality of data groups to a receiver at a first power level, retransmitting a first one of the data groups to the receiver at a second power level lower than the first power level, providing feedback from the receiver relating to the retransmission of the first one of the data groups, and retransmitting a second one of the data groups to the receiver at a third power level different from the second power level, the third power level being a function of the feedback. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

US Patent:

7752522, Jul 6, 2010

Filed:

Nov 21, 2006

Appl. No.:

11/562399

Inventors:

Ahmed Saifuddin - San Diego CA, US
Joseph P. Odenwalder - Rancho Santa Fe CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03M 13/00

US Classification:

714755

Abstract:

A method and an apparatus for recovery of particular bits in a frame are disclosed. An origination station forms a frame structure with groups of information bits of different importance. All the information bits are then protected by an outer quality metric. Additionally, the groups of more important information bits are further protected by an inner quality metric; each group having a corresponding quality metric. The frame is then transmitted to a destination station. The destination station decodes the received frame and decides, first in accordance with the outer quality metric, whether the frame has been correctly received, or whether the frame is erased. If the frame has been declared erased, the destination station attempts to recover the groups of more important information bits in accordance with the corresponding inner quality metrics.