Hau Thanh Tran

US Patent:

7516390, Apr 7, 2009

Filed:

Nov 2, 2005

Appl. No.:

11/264998

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
Joseph Paul Lauer - North Reading MA, US
Kelly Brian Cameron - Irvine CA, US
Tak K. Lee - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 13/00

US Classification:

714755, 714786, 714784, 714756

Abstract:

LDPC (Low Density Parity Check) coding and interleaving implemented in multiple-input-multiple-output (MIMO) communication systems. As described herein, a wide variety of irregular LDPC codes may be generated using GRS or RS codes. A variety of communication device types are also presented that may employ the error correcting coding (ECC) using a GRS-based irregular LDPC code, along with appropriately selected interleaving, to provide for communications using ECC. These communication devices may be implemented to in wireless communication systems including those that comply with the recommendation practices and standards being developed by the IEEE 802. 11n Task Group (i. e. , the Task Group that is working to develop a standard for 802. 11 TGn (High Throughput)).

US Patent:

7746886, Jun 29, 2010

Filed:

Nov 1, 2004

Appl. No.:

10/979368

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
Jason A. Trachewsky - Menlo Park CA, US
Nambirajan Seshadri - Irvine CA, US
Kelly Brian Cameron - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04W 76/00

US Classification:

370437, 370465

Abstract:

A method for asymmetrical MIMO wireless communication begins by determining a number of transmission antennas for the asymmetrical MIMO wireless communication. The method continues by determining a number of reception antennas for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas exceeds the number of reception antennas, using spatial time block coding for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas does not exceed the number of reception antennas, using spatial multiplexing for the asymmetrical MIMO wireless communication.

US Patent:

7873022, Jan 18, 2011

Filed:

Sep 3, 2004

Appl. No.:

10/933586

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
Jason A. Trachewsky - Menlo Park CA, US
Nambirajan Seshadri - Irvine CA, US
Kelly Brian Cameron - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 7/216
H04K 1/10

US Classification:

370342, 370335, 375260

Abstract:

A wireless local area network (WLAN) transmitter includes a MAC module, a PLCP module, and a PMD module. The Medium Access Control (MAC) module is operably coupled to convert a MAC Service Data Unit (MSDU) into a MAC Protocol Data Unit (MPDU) in accordance with a WLAN protocol. The Physical Layer Convergence Procedure (PLCP) Module is operably coupled to convert the MPDU into a PLCP Protocol Data Unit (PPDU) in accordance with the WLAN protocol. The Physical Medium Dependent (PMD) module is operably coupled to convert the PPDU into a plurality of radio frequency (RF) signals in accordance with one of a plurality of operating modes of the WLAN protocol, wherein the plurality of operating modes includes multiple input and multiple output combinations.

US Patent:

8059740, Nov 15, 2011

Filed:

May 28, 2004

Appl. No.:

10/856023

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
Jason A. Trachewsky - Menlo Park CA, US
Nambirajan Seshadri - Irvine CA, US
Kelly Brian Cameron - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 5/12

US Classification:

375265, 375261

Abstract:

A wireless local area network (WLAN) transmitter includes a baseband processing module and a plurality of radio frequency (RF) transmitters. The baseband processing module is operably coupled to process data by scrambling the data in accordance with a pseudo random sequence to produce scrambled data. The processing of the data continues by selecting one of a plurality of encoding modes based on a mode selection signal. The processing of the data continues by encoding the scrambled data in accordance with the one of the plurality of encoding modes to produce encoded data. The processing of the data continues by determining a number of transmit streams based on the mode selection signal. The processing of the data further continues by converting the encoded data into streams of symbols in accordance with the number of transmit streams and the mode selection signal. A number of the plurality of RF transmitters are enabled based on the mode selection signal to convert a corresponding one of the streams of symbols into a corresponding RF signal such that a corresponding number of RF signals is produced.

US Patent:

8254407, Aug 28, 2012

Filed:

May 20, 2010

Appl. No.:

12/783730

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
James A. Trachewsky - Menlo Park CA, US
Nambirajan Seshadri - Irvine CA, US
Kelly B. Cameron - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04W 76/00

US Classification:

370437, 370465

Abstract:

A method for asymmetrical MIMO wireless communication begins by determining a number of transmission antennas for the asymmetrical MIMO wireless communication. The method continues by determining a number of reception antennas for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas exceeds the number of reception antennas, using spatial time block coding for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas does not exceed the number of reception antennas, using spatial multiplexing for the asymmetrical MIMO wireless communication.

US Patent:

8407556, Mar 26, 2013

Filed:

Mar 28, 2009

Appl. No.:

12/413552

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
Joseph Paul Lauer - Mountain View CA, US
Kelly Brian Cameron - Irvine CA, US
Tak K. Lee - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 13/00

US Classification:

714755, 714786, 714784, 714756

Abstract:

LDPC (Low Density Parity Check) coding and interleaving implemented in multiple-input-multiple-output (MIMO) communication systems. As described herein, a wide variety of irregular LDPC codes may be generated using GRS or RS codes. A variety of communication device types are also presented that may employ the error correcting coding (ECC) using a GRS-based irregular LDPC code, along with appropriately selected interleaving, to provide for communications using ECC. These communication devices may be implemented to in wireless communication systems including those that comply with the recommendation practices and standards being developed by the IEEE 802. 11Task Group (i. e. , the Task Group that is working to develop a standard for 802. 11 TGn (High Throughput)).

US Patent:

8437362, May 7, 2013

Filed:

Jul 26, 2012

Appl. No.:

13/558985

Inventors:

Christopher J. Hansen - Los Altos CA, US
Jason A. Trachewsky - Menlo Park CA, US
Nambirajan Seshadri - Irvine CA, US
Kelly Brian Cameron - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04W 76/00

US Classification:

370437, 370465

Abstract:

A method for asymmetrical MIMO wireless communication begins by determining a number of transmission antennas for the asymmetrical MIMO wireless communication. The method continues by determining a number of reception antennas for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas exceeds the number of reception antennas, using spatial time block coding for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas does not exceed the number of reception antennas, using spatial multiplexing for the asymmetrical MIMO wireless communication.

US Patent:

20110110353, May 12, 2011

Filed:

Jan 13, 2011

Appl. No.:

13/006264

Inventors:

Christopher J. Hansen - Sunnyvale CA, US
Jason A. Trachewsky - Menlo Park CA, US
Nambirajan Seshadri - Irvine CA, US
Kelly Brian Cameron - Irvine CA, US
Hau Thien Tran - Irvine CA, US

Assignee:

BROADCOM CORPORATION - Irvine CA

International Classification:

H04W 84/12

US Classification:

370338

Abstract:

A wireless local area network (WLAN) transmitter includes a MAC module, a PLCP module, and a PMD module. The Medium Access Control (MAC) module is operably coupled to convert a MAC Service Data Unit (MSDU) into a MAC Protocol Data Unit (MPDU) in accordance with a WLAN protocol. The Physical Layer Convergence Procedure (PLCP) Module is operably coupled to convert the MPDU into a PLCP Protocol Data Unit (PPDU) in accordance with the WLAN protocol. The Physical Medium Dependent (PMD) module is operably coupled to convert the PPDU into a plurality of radio frequency (RF) signals in accordance with one of a plurality of operating modes of the WLAN protocol, wherein the plurality of operating modes includes multiple input and multiple output combinations.