Angel V Lozano

US Patent:

6920118, Jul 19, 2005

Filed:

Dec 20, 2000

Appl. No.:

09/742669

Inventors:

Angel Lozano - New York NY, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04J007/204
H04J003/00
H04Q007/00

US Classification:

370329, 370335, 370336, 370342, 370345, 370437, 370441, 370442

Abstract:

Method and apparatus for communicating heterogeneous data traffic simultaneously using a hybrid Code Division Multiplexing (CDM)/Code Division Multiple Access (CDMA)-Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) system which communicates data on a per data type basis, rather than a per user or per channel basis. A transmitter accepts a plurality of data streams, each of which includes either Constant Bit Rate Data (CBR) or Variable Burst Rate Data (VBR), where CBR is characterized by a steady data rate and strict latency requirements and VBR is characterized by a variable data rate with large peaks and lulls and loose latency requirements. The system identifies each input data stream as CBR or VBR. CBR data is spread using CDM/CDMA with an appropriate spreading factor for CBR, whereas VBR data is modulated/encoded and interleaved with CDM/CDMA with an appropriate spreading factor for VBR and TDM/TDMA, respectively. The modulated CBR data and VBR data streams are then transmitted by the transmitter to a receiver, which receives and demodulates the received data streams to recover the original CBR data and VBR data streams.

US Patent:

7113558, Sep 26, 2006

Filed:

May 11, 2004

Appl. No.:

10/842857

Inventors:

Angel Lozano - New York NY, US
Reinaldo A Valenzuela - Holmdel NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 1/02

US Classification:

375347, 375348

Abstract:

Signals are developed for use in a wireless system with multiple transmit and multiple receive antennas so that even in the face of some correlation the most open-loop capacity that can be achieved using a substantially open-loop system with a channel of that level of correlation is obtained. In accordance with the principles of the invention, the signals transmitted from the various antennas are processed so as to improve their ability to convey the maximum amount of information. More specifically, the data to be transmitted is divided into M+1 substreams, where M is the number of transmit antennas. Each transmit antenna is supplied with a combination signal that is made up of a weighted version of a common one of the substreams and a weighted version of a respective one of the substreams that is supplied uniquely for that antenna, so that there are M transmit signals. A receiver having N antennas receives the M transmit signals as combined by the channel and reconstitutes the original data therefrom. This may be achieved using successive decoding techniques.

US Patent:

7116652, Oct 3, 2006

Filed:

Oct 18, 2001

Appl. No.:

09/999442

Inventors:

Angel Lozano - New York NY, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 7/00
H04H 1/00

US Classification:

370334, 370339

Abstract:

In a wireless communication system using multiple antennas at the transmitter and multiple antennas at the receiver, with a sufficiently large number of antennas and/or diversity order, the same performance that is obtainable when employing instantaneous rate indication feedback can be attained without any such short-term feedback by adjusting the data rate of each transmit antenna according to a prescribed function. The prescribed function does not depend on the short-term state of the channel, but instead only depends on its long-term statistics, which may be fed back from the receiver to the transmitter at relatively lengthy intervals.

US Patent:

8634481, Jan 21, 2014

Filed:

Nov 16, 2000

Appl. No.:

09/714084

Inventors:

Seong-Taek Chung - Moutain View CA, US
Howard C Huang - New York NY, US
Angel Lozano - New York NY, US

Assignee:

Alcatel Lucent - Paris

International Classification:

H04L 27/00

US Classification:

375259, 375267, 375260, 375299, 370341, 370342, 370362, 370210, 455 78, 455272

Abstract:

In a wireless communication system using multiple antennas at the transmitter and multiple antennas at the receiver, a so called multiple-input multiple-output (MIMO) system, a substantial improvement in capacity over the case of no feedback can be achieved using considerably less bandwidth than is required to feedback the channel estimate or channel statistics, by supplying as feedback for each data substream of an overall data stream an indicator of a rate and/or an indicator of a gain for transmission of that data substream. The indicator of the rate and/or the indicator of the gain may be the rate and/or gain directly or an encoded representation of the rate and/or gain. Typically, the best performance is achieved if indicators of both the rate and the gain are fed back. If the invention is implemented for wireless systems, then typically for each data substream there is a separate, independent antenna. The rate and the gain are computed as a function of a channel estimate which is developed at the receiver.

US Patent:

6778612, Aug 17, 2004

Filed:

Aug 18, 2000

Appl. No.:

09/641414

Inventors:

Angel Lozano - New York NY
Reinaldo A Valenzuela - Holmdel NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 110

US Classification:

375299, 375349, 455101

Abstract:

Signals are developed for use in a wireless system with multiple transmit and multiple receive antennas so that even in the face of some correlation the most open-loop capacity that can be achieved using a substantially open-loop system with a channel of that level of correlation is obtained. In accordance with the principles of the invention, the signals transmitted from the various antennas are processed so as to improve their ability to convey the maximum amount of information. More specifically, the data to be transmitted is divided into M+1 substreams, where M is the number of transmit antennas. Each transmit antenna is supplied with a combination signal that is made up of a weighted version of a common one of the substreams and a weighted version of a respective one of the substreams that is supplied uniquely for that antenna, so that there are M transmit signals. A receiver having N antennas receives the M transmit signals as combined by the channel and reconstitutes the original data therefrom. This may be achieved using successive decoding techniques.