Dong Zhao Wang

US Patent:

7809097, Oct 5, 2010

Filed:

Mar 16, 2006

Appl. No.:

11/376287

Inventors:

Dong Wang - Ossining NY, US
Jinyun Zhang - Cambridge MA, US

Assignee:

Renesas Electronics Corporation - Kawasaki-Shi, Kanagawa

International Classification:

H04K 1/10
H04B 1/00

US Classification:

375355, 375149

Abstract:

A frame timing synchronization technique for orthogonal frequency division multiplexing (OFDM) systems is presented. First, a coarse synchronization technique generates a coarse frame timing estimate. The coarse synchronization technique applies a sliding window differentiator to the output of a conventional auto-correlator to mitigate the plateau effect associated with conventional auto-correlation techniques. Second, a fine synchronization technique generates a fine frame timing estimate. The fine synchronization technique uses the coarse frame timing estimate to reduce the number of cross-correlation calculations. Additionally, the fine synchronization technique acquires a fine frame timing estimate based on a signal-to-interference ratio (SIR) metric, which is more robust to multi-paths and pseudo multi-paths caused by cyclic delay diversity (CDD) schemes than conventional cross-correlation synchronization techniques. A fine-tuning technique generates a desired frame timing estimate by searching a first signal path in a searching window around the fine frame timing estimate to further refine frame timing synchronization.

US Patent:

8432980, Apr 30, 2013

Filed:

Mar 12, 2008

Appl. No.:

12/529413

Inventors:

Jun Yang - Croton-On-Hudson NY, US
Dong Wang - Ossining NY, US

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

H04K 1/10

US Classification:

375260, 375261, 375267, 375295, 375299, 375350

Abstract:

A multiple-input multiple-output multi-band OFDM transmission system () employs a data interleaving arrangement that is backwards compatible with specifications for a legacy interleaver. In one embodiment, an input data stream is parsed into two or more separate data streams by a round robin parser () and each of the separate data streams is shifted by a corresponding number of symbols and then interleaved by a legacy interleaver (). In another embodiment, data for a plurality (N*i) of symbols is split into N sequential groups of data, each group corresponding to one of N MIMO spatial streams, each stream including data for i symbols. Each group is then interleaved by a legacy interleaver (). In a third embodiment, an input data stream is interleaved by a scaled version of the legacy interleaver (), and then parsed by a round-robin parser ().

US Patent:

8553788, Oct 8, 2013

Filed:

Mar 9, 2009

Appl. No.:

12/867917

Inventors:

Dong Wang - Ossining NY, US
Yue Shang - Natick MA, US
Dagnachew Birru - Yorktown Heights NY, US

Assignee:

Koninklijke Philips N.V. - Eindhoven

International Classification:

H04L 27/28

US Classification:

375260, 375285

Abstract:

A method () for performing a multiple-sub-carrier-joint-modulation (MSJM) precoding. The method includes grouping input information bits into bit blocks (S); converting the bit blocks into bit vectors (S); mapping each of the bit vectors into a symbol vector (S); and modulating symbol vectors into data subcarriers (S).

US Patent:

8559552, Oct 15, 2013

Filed:

Apr 14, 2009

Appl. No.:

12/937015

Inventors:

Dong Wang - Ossining NY, US
Dagnachew Birru - Yorktown Heights NY, US

Assignee:

Koninklijke Philips N.V. - Eindhoven

International Classification:

H04L 27/00

US Classification:

375299, 375264, 375284, 375285, 375296, 375298

Abstract:

A method (300) for performing dual carrier modulation (DCM) precoding. The method comprises generating data sub-blocks (S320), independently interleaving the sub-blocks (S330), generating bit vectors by grouping bits of the interleaved sub-blocks (S350), mapping the bit vectors into data symbols (S360), and precoding the data symbols using a precoding matrix to generate precoded symbols (S370).

US Patent:

20100260240, Oct 14, 2010

Filed:

Dec 5, 2008

Appl. No.:

12/746557

Inventors:

Dong Wang - Ossining NY, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS, N.V. - EINDHOVEN

International Classification:

H04L 25/52

US Classification:

375214, 375211

Abstract:

Relay nodes relay data from a source node () to a destination node () in an asynchronous cooperative wireless communication system. Each relay node () includes a serial-to-parallel partitioner (), a row selector (), a cyclic shifter () and an SCBT modulator (). The serial-to-parallel partitioner partitions symbols corresponding to received information into parallel blocks. The row selector selects one row of a coding matrix for each of the parallel blocks and constructs symbol blocks corresponding to the parallel blocks based on the selected row. The cyclic shifter shifts a cyclic delay of each of the symbol blocks and generates shifted symbol blocks corresponding to the symbol blocks. The SCBT modulator pads a guard interval to each shifted symbol block to remove the effects of asynchronous relay transmission. Constructing the symbol blocks and generating the shifted symbol blocks provides virtual spatial diversity among the relay nodes, which varies directly with a number of participating relay nodes.

US Patent:

20100316153, Dec 16, 2010

Filed:

Mar 9, 2009

Appl. No.:

12/867937

Inventors:

Dong Wang - Ossining NY, US
Yue Shang - Natick MA, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS, N.V. - EINDHOVEN

International Classification:

H04L 27/28

US Classification:

375260

Abstract:

An orthogonal frequency division multiplexing (OFDM) multiband transmitter () adapted to perform multiple-subcarrier-joint-modulation (MSJM) precoding. The transmitter comprises a bit interleaver () for independently interleaving bit blocks and grouping bits of each interleaved bit block to bit groups; a symbol mapping unit () for mapping each of the bit groups to symbols according to a MSJM scheme; and a symbol interleaver () for allocating the symbols to data subcarriers of a plurality of consecutive OFDM symbols.

US Patent:

20100322334, Dec 23, 2010

Filed:

Mar 9, 2009

Appl. No.:

12/867924

Inventors:

Dong Wang - Ossining NY, US
Jun Yang - Croton-On-Hudson NY, US
Dagnachew Birru - Yortown Heights NY, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS, N.V. - EINDHOVEN

International Classification:

H04B 7/02

US Classification:

375267

Abstract:

A multi-band communication system (). The system includes a plurality of transmit channels (--N), wherein each transmit channel (-X) transmits data streams through a single sub-band; and a plurality of receive channels (--N), wherein each receive channel (-X) receives data streams of a single sub-band. In an embodiment of the invention, each transmit channel (-X) and its respective receive channel (-X) are configured with a different set of channel codes to encode and decode the data. The set of channel codes is determine by an more channel codes adaptive modulation coding (AMC) controller (-X) based on the condition of the link between a transmit channel (-X) and a receive channel (-X).

US Patent:

20100329366, Dec 30, 2010

Filed:

Mar 9, 2009

Appl. No.:

12/867932

Inventors:

Dong Wang - Ossining NY, US
Jun Yang - Croton-On-Hudson NY, US
Dagnachew Birru - Yorktown Heights NY, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS, N.V. - EINDHOVEN

International Classification:

H04L 27/00

US Classification:

375259

Abstract:

A physical layer convergence protocol (PLCP) data structure () transmitted in a multiple-input-multiple-output (MIMO) communication system. The PLCP data structure comprises a legacy portion including a legacy preamble () and a legacy header (), wherein the legacy preamble () and the legacy header () carry information compliant with at least a WiMedia standard; and a high throughput (HT) portion including a HT preamble () and a HT header (), and wherein the HT preamble () carries information enabling a receiver of the MIMO communication system to decode received signals.