1
Shiquan Wu, Wen Tong, Leo Strawczynski: Adaptive time diversity and spatial diversity for OFDM. Nortel Networks, Mintz Levin Cohn Ferris Glovsky & Popeo P C, January 10, 2006: US06985434 (189 worldwide citation)

An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carrier ...


2
Shiquan Wu, Wen Tong, Jianglei Ma: Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system. Nortel Networks, Mintz Levin Cohn Ferris Glovsky & Popeo P C, February 1, 2005: US06850481 (141 worldwide citation)

The distortion in the sub-carrier signals is determined by transmitting known values that are incorporated into the preamble portion of the frame and/or are incorporated into pilot symbols that are inserted into the data portion of the frame. The receiver typically receives these known values in a d ...


3
Jianglei Ma, Wen Tong, Shiquan Wu: Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system. Nortel Networks, June 19, 2007: US07233625 (108 worldwide citation)

One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framing, channels estimation, offsets an ...


4
Jianglei Ma, Wen Tong, Shiquan Wu: Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications. Nortel Networks, Mintz Levin Cohn Ferris Glovsky & Popeo, March 7, 2006: US07009931 (67 worldwide citation)

Methods and apparatus are described for time synchronizing a receiver to orthogonal frequency division multiplexing (OFDM) signals in a multiple-input/multiple-output (MIMO) system, the signals being transmitted from multiple transmitters and received at multiple receivers. The method includes deter ...


5
Shiquan Wu, Jung Yee: Systems and etiquette for home gateways using white space. Wi LAN, Procopio Cory Hargreaves & Savitch, January 31, 2012: US08107391 (36 worldwide citation)

Methods and systems for sharing white space with primary services and other emerging services are provided. Signal distribution within a specified location, such as a dwelling, is performed using a home gateway that identifies unused white space, reserves such white space spectrum, and delivers data ...


6
Peiying Zhu, Wen Tong, Ming Jia, Jianming Wu, Shiquan Wu, Steve Beaudin: Method and apparatus for relaying a wireless signal. Nortel Networks, March 25, 2008: US07349665 (36 worldwide citation)

Systems and Methods are provided for relaying wireless signals bi-directionally between user equipment (UE) and base station transceivers (BTS). Various slot types are defined during which a relay node takes on the personality of either the UE or the BTS. In order to implement the relay node with a ...


7
Shiquan Wu, Song Zhang, Xixian Chen: System and method for estimating signal time of arrival. Nortel Networks, Paul Hashim, December 10, 2002: US06493380 (34 worldwide citation)

A method for estimating a time delay including the steps of first, estimating a channel spectrum from a received signal and a known reference signal, second, extracting a virtual array structure from the estimated channel spectrum, and third, determining the signal time delay using the virtual array ...


8
Shiquan Wu, Wen Tong, Peiying Zhu, Ming Jia, Hua Xu, Daniel Boudreau, Jianming Wu, Mo Han Fong, Keith Edwards: System and method for embedding OFDM in CDMA systems. Nortel Networks, December 30, 2008: US07471932 (33 worldwide citation)

Systems and methods of combining OFDM and CDMA signals are provided. An OFDM packet data channel is overlaid over CDMA transmissions. The channel is scheduled slotwise between multiple users. In some embodiments, there is a CDMA packet data channel which is scheduled together with the OFDM packet da ...


9
Jianglei Ma, Wen Tong, Shiquan Wu: Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system. Nortel Networks, July 22, 2008: US07403570 (29 worldwide citation)

One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framing, channels estimation, offsets an ...


10
Guo Qiang Wang, Wen Tong, Shiquan Wu: Method and system for a wireless multi-hop relay network. Nortel Networks, Guerin & Rodriguez, July 26, 2011: US07986915 (27 worldwide citation)

In a wireless multi-hop relay network arranged in a tree topology, the base station and one or more relay stations are associated as a virtual base station (VBS). The base station and each relay station have a unique virtual base station identifier (VBS-ID) associated with the path defined by the ba ...