1
Jianglei Ma, Wen Tong, Ming Jia, Peiying Zhu, Dong Sheng Yu: Dual-mode shared OFDM methods/transmitters, receivers and systems. Nortel Networks, June 23, 2009: US07551546 (142 worldwide citation)

A wireless terminal and network terminal are provided for implementing a new uplink OFDM protocol. In the new protocol, the wireless terminal has a first transmit chain for generating and transmitting a low rate mode OFDM transmission in a first frequency band of the OFDM band; and a second transmit ...


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, Ming Jia, Peiying Zhu, Wen Tong: Scattered pilot pattern and channel estimation method for MIMO-OFDM systems. Nortel Networks, July 24, 2007: US07248559 (117 worldwide citation)

A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting ante ...


4
Jianglei Ma, Ming Jia, Peiying Zhu, Wen Tong, Dong Sheng Yu: Soft handoff for OFDM. Withrow & Terranova PLLC, May 9, 2006: US07042858 (114 worldwide citation)

The present invention relates to soft handoffs in an OFDM system. Each mobile terminal measures pilot signal strengths of transmissions from adjacent base stations. If the pilot signal strength for a base station exceeds the defined threshold, that base station is added to an active set list. Each m ...


5
Jianglei Ma, Ming Jia, Peiying Zhu, Wen Tong: System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design. Nortel Networks, June 16, 2009: US07548506 (113 worldwide citation)

A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of si ...


6
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 ...


7
Ming Jia, Jianglei Ma, Peiying Zhu, Dong Sheng Yu, Wen Tong: Adaptive modulation and coding. Nortel Networks, Withrow & Terranova PLLC, September 5, 2006: US07103325 (74 worldwide citation)

The present invention selects a space-time encoding mode to use when transmitting with spatial diversity based on the receive diversity associated with a receiver device and the quality of the transmission channels based on information fed back from the receiver device. The selectable space-time enc ...


8
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 ...


9
Jianglei Ma, Ming Jia, Peiying Zhu, Wen Tong: Physical layer structures and initial access schemes in an unsynchronized communication network. Nortel Networks, Ogilvy Renault, June 15, 2010: US07738437 (48 worldwide citation)

Physical layer structures and related access schemes for unsynchronized communication networks are provided. Access channel information, preferably including a common synchronization code associated with all transceiver stations in a communication network and a cell-specific synchronization code uni ...


10
Wen Tong, Peiying Zhu, Jianglei Ma, Ming Jia: Scattered pilot pattern and channel estimation method for MIMO-OFDM systems. Nortel Networks, August 17, 2010: US07778337 (45 worldwide citation)

Methods and apparatus are provided for inserting data symbols and pilot symbols in an OFDM (orthogonal frequency division multiplexing) transmission resource utilizing frequency hopping patterns for the data symbols and/or the pilot symbols. Data symbols and pilot symbols are allocated for down link ...