1
Nambirajan Seshadri, Carl Erik W Sundberg, Wai Choong Wong: Method of multiple access. AT&T, Katharyn E Olson, May 30, 1995: US05420851 (184 worldwide citation)

A low delay multiple access scheme called Shared Time-Division Duplexing (STDD), allows both uplink and downlink voice traffic to share a common channel. The scheme contains separate uplink and downlink control channels and a common voice information channel. The control channels comprise means for ...


2
Nambirajan Seshadri: Wireless delivery of message using combination of text and voice. AT&T, June 19, 2001: US06249808 (156 worldwide citation)

An email is received and stored at a network node. The email message is divided into a first text portion and a second voice portion. The division of the email message into the first and second portions can be determined by user preferences stored in a user profile in the network or by attached keyw ...


3
Nambirajan Seshadri: Method and apparatus for providing antenna diversity. AT&T, Thomas A Restaino, December 26, 1995: US05479448 (148 worldwide citation)

A method and apparatus providing antenna diversity is disclosed. A set of bits of a digital signal are used to generate a codeword of N symbols. Codewords are provided according to a channel code having a minimum Hamming distance, d.sub.min, where 2.ltoreq.d.sub.m .ltoreq.N. N signals representing N ...


4
Arthur Robert Calderbank, Ayman F Naguib, Nambirajan Seshadri, Vahid Tarokh: Method and apparatus for data transmission using multiple transmit antennas. AT&T, September 5, 2000: US06115427 (131 worldwide citation)

A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output c ...


5
Arthur R Calderbank, Hamid Jafarkhani, Ayman F Naguib, Nambirajan Seshadri, Vahid Tarokh: Decoding for generalized orthogonal designs for space-time codes for wireless communication. AT & T, July 11, 2000: US06088408 (94 worldwide citation)

The prior art teachings for encoding signals and transmitting them over a plurality of antennas are advanced by disclosing a method for encoding for any number of transmitting antennas. Also disclosed is a generalized approach for maximum likelihood decoding where a decision rule is formed for all o ...


6
Ayman F Naguib, Nambirajan Seshadri: Combined interference cancellation and maximum likelihood decoding of space-time block codes. AT&T, January 23, 2001: US06178196 (91 worldwide citation)

Block-encoded transmissions of a multi-antenna terminal unit are effectively detected in the presence of co-channel interfering transmissions from other multi-antenna terminal units, when the base station has a plurality of antennas, and interference cancellation is combined with maximum likelihood ...


7
Jeyhan Karaoguz, Marc Abrams, Nambirajan Seshadri: Digital personal assistance via a broadband access gateway. Broadcom Corporation, McAndrews Held & Malloy, December 14, 2010: US07853255 (90 worldwide citation)

A system and method supporting access, coordination, modification, updating, and management of multiple sources of multimedia information resident on a plurality of access devices is disclosed. A broadband access gateway may support applications that perform user services involving multiple sources ...


8
Siritiat Lek Ariyavisitakul, Ye Li, Nambirajan Seshadri, Vahid Tarokh: Channel estimation for OFDM systems with transmitter diversity. AT&T, October 29, 2002: US06473393 (81 worldwide citation)

In a receiver that includes a plurality of receiving antennas that supply signals to associated OFDM receiving modules, and the receiving modules provide signals that are applied to a detector, channel parameters that are needed for proper detection are estimated during normal operation, in addition ...


9
Oscar E Agazzi, Nambirajan Seshadri: Method and apparatus for compensation of linear or nonlinear intersymbol interference and noise correlation in magnetic recording channels. Lucent Technologies, March 30, 1999: US05889823 (80 worldwide citation)

A method and apparatus for decoding a signal in the presence of linear or nonlinear interference, correlated noise or a combination thereof. The method involves a concatenated decoder comprising an inner decoder and a postprocessor. N most likely paths are generated by the inner decoder, or a combin ...


10
Peter Hoeher, Nambirajan Seshadri: Post processing method and apparatus for symbol reliability generation. AT&T IPM, Katharyn E Olson, October 10, 1995: US05457704 (70 worldwide citation)

A method for a post-processors provides reliability information about every decoded data symbol at the output of an arbitrary decoder. This reliability information is generated by comparing the decoded sequence to a small list of alternative sequences which differ from the decoded sequence at least ...



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