| Patent Number |
Title Of Patent |
Date Issued |
| 7574224 |
Methods and apparatus for performing timing synchronization with base stations |
August 11, 2009 |
| A wireless terminal using OFDM signaling supporting both terrestrial and satellite base station connectivity operates using conventional access probe signaling in a first mode of operation to establish a timing synchronized wireless link with a terrestrial base station. In a second m |
| 7567502 |
Methods and apparatus for adjusting bandwidth allocation in a wireless communications system |
July 28, 2009 |
| More efficient utilization of available bandwidth is implemented in an OFDM wireless communication system. The partitions of bandwidth may be of different sizes and may be different from the original system design parameters. Basic system structure such as the number of tones used and |
| 7558245 |
Method and apparatus for time and frequency synchronization of OFDM communication systems |
July 7, 2009 |
| A method and apparatus for joint time and frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems. A multitone pilot signal is sent in a designated OFDM symbol period. The receiver synchronizes to the pilot signal in a two-stage procedure. The first st |
| 7554977 |
Method and apparatus for indicating packet boundaries in frames |
June 30, 2009 |
| Frames including a packet boundary information field indicator and, optionally, packet boundary information field in addition to packet data are described. Methods and apparatus for generating and using such frames are also described. The packet boundary indicator indicates the presence |
| 7539475 |
Wireless terminal methods and apparatus for DC tone special treatment |
May 26, 2009 |
| Special DC tone treatment in a wireless communications system, e.g., an OFDM system, is discussed. In the downlink, a wireless terminal receiver introduces self-interference at the DC tone from the RF/baseband conversion. A base station every so often does not transmit on the downlin |
| 7471702 |
Methods and apparatus for implementing, using, transmitting, and/or receiving signals at least s |
December 30, 2008 |
| Base stations transmit strip signals using strip signal segments and self supporting modulation scheme techniques facilitating rapid channel estimate. A strip segment occupies one OFDM symbol time interval and uses a set of downlink tones; some, e.g., half, of the tones are left unused |
| 7463669 |
Method of tone allocation for tone hopping sequences |
December 9, 2008 |
| Methods and apparatus for allocating tones for communications purposes in adjoining cells of an OFDM system are described. Tones used in each cell are allocated to tone hopping sequences according to a tone to tone hopping sequence allocation function. Different cells use different tone |
| 7450543 |
Methods and apparatus for wireless network connectivity |
November 11, 2008 |
| Methods and apparatus which allow a wireless terminal (302) to simultaneously maintain connections with multiple base stations (304, 306) are described. Each wireless terminal (302) is capable of supporting multiple separate timing and/or other control loops one, for each base statio |
| 7420939 |
Methods and apparatus of power control in wireless communication systems |
September 2, 2008 |
| The present invention involves apparatus and methods to perform wireless terminal transmission power control. The invention uses novel and highly efficient methods to: convey power control information, specify power control level adjustments, recognize power control information, limit |
| 7411895 |
Controlled superposition coding in multi-user communication systems |
August 12, 2008 |
| Methods of using superposition coding in a communications systems, e.g., a multi-user communications system. Superpostion coding in accordance with the invention occurs in the case of an uplink by transmissions of different wireless terminals transmitting using the same communications |
| 7406058 |
Methods and apparatus of transmitting user data using traffic channels |
July 29, 2008 |
| The invention describes methods and apparatus to structure the air link resources, e.g. traffic channel, into segments of different transmission segment types and effectively use that novel structure. Different segment types are structured to achieve different performance characteristics |
| 7403470 |
Communications system, methods and apparatus |
July 22, 2008 |
| An OFDM wireless communications system includes terrestrial and satellite based base stations. Mobile nodes support two uplink modes of operation, multi-tone mode for terrestrial station interaction and single tone mode for satellite base station interaction. In single tone mode the peak |
| 7398111 |
Methods and apparatus for operating mobile nodes in multiple states |
July 8, 2008 |
| The use of multiple states of mobile communication device operation to allow a single base station to support a relatively large number of mobile nodes is described. Various states require different amounts of communications resources, e.g., bandwidth and/or control signaling. Differ |
| 7388845 |
Multiple access wireless communications system using a multisector configuration |
June 17, 2008 |
| Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given |
| 7386306 |
Multi-carrier communications methods and apparatus |
June 10, 2008 |
| Methods and apparatus for implementing a multi-carrier communications system are described. Various approaches to a phased system deployment and system configurations resulting from different levels of deployment are described. In addition mobile node and methods of operating mobile |
| 7382755 |
Method to convey uplink traffic information |
June 3, 2008 |
| Methods and apparatus for a Wireless Terminal (WT) to convey uplink traffic information, e.g., uplink channel resource requests, to a Base Station (BS) are described. Uplink transmission resources are requested for data corresponding to different priority levels. The WT keeps track o |
| 7379446 |
Enhanced beacon signaling method and apparatus |
May 27, 2008 |
| Methods and apparatus for using high power narrow signals, e.g., tones, for communicating transmitter information without putting the full transmission power available into the transmitted tone or tones are described. User data is transmitted in parallel with transmitter information |
| 7366200 |
Beacon signaling in a wireless system |
April 29, 2008 |
| A few high power tones used for synchronization and/or other purposes are transmitted in a FDM system during a period of time into a region, e.g., sector of a cell, e.g., a symbol transmission time period. During normal data transmission symbol periods signals are transmitted using at le |
| 7363039 |
Method of creating and utilizing diversity in multiple carrier communication system |
April 22, 2008 |
| In many cellular systems, reusing spectrum bandwidth, creates problems in boundary regions between the cells and sectors where the signal strength received from adjacent base stations or adjacent sector transmissions of a single base station may be nearly equivalent. The invention create |
| 7292868 |
Apparatus and method for use in paging mode in wireless communications systems |
November 6, 2007 |
| In a unique paging time slot format, each of the allocated paging time slots occurs periodically and is split into several prescribed paging time slots including at least one first type paging time slot having a relatively short duration and at least one second type paging time slot |
| 7233800 |
Wireless terminal location using apparatus and methods employing carrier diversity |
June 19, 2007 |
| Wireless terminals, e.g., mobile nodes, receive, identify, and measure broadcast signals from a plurality of cells. They determine relative transmission power relationships corresponding to the received measured signals and determine at least two channel gain ratios. A geographic area |
| 7230942 |
Method of downlink resource allocation in a sectorized environment |
June 12, 2007 |
| Methods and apparatus for communicating different size coded blocks of information in a wireless sectorized communications cell are described. Information may be categorized and formed into large, medium, and small coded blocks which may include error correction code bits based on the |
| 7218948 |
Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for gener |
May 15, 2007 |
| Pilot signal transmission sequences and methods for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a |
| 7212564 |
Method of tone allocation for tone hopping sequences |
May 1, 2007 |
| Methods and apparatus for allocating tones for communications purposes in adjoining cells of an OFDM system are described. Tones used in each cell are allocated to tone hopping sequences according to a tone to tone hopping sequence allocation function. Different cells use different tone |
| 7142864 |
Methods and apparatus of enhancing performance in wireless communication systems |
November 28, 2006 |
| Methods and apparatus for supporting and using multiple communications channels corresponding to different transmit technologies and/or access technologies in parallel within a cell of a wireless communications system are described. Mobile nodes support multiple technologies and can |
| 7133354 |
Synchronization techniques for a wireless system |
November 7, 2006 |
| Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given |
| 7061994 |
Methods and apparatus for I/Q imbalance compensation |
June 13, 2006 |
| Methods and apparatus for performing amplitude and phase imbalance correction operations on in-phase and quadrature phase signal components corresponding to a received signal are described. The imbalance correction operations relay on the use of relatively simple to implement feedbac |
| 7031292 |
Method of scheduling regular signal transmission in a cellular wireless system |
April 18, 2006 |
| Scheduling of regular signal transmissions, e.g., between a plurality of wireless terminals and a base station in a cellular network in a manner designed to reduce or minimize recurring periodic interference encountered by individual wireless terminals from transmission in neighborin |
| 7027429 |
Method and apparatus for time and frequency synchronization of OFDM communication systems |
April 11, 2006 |
| A method and apparatus for joint time and frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems. A multitone pilot signal is sent in a designated OFDM symbol period. The receiver synchronizes to the pilot signal in a two-stage procedure. The first st |
| 7023928 |
Synchronization of a pilot assisted channel estimation orthogonal frequency division multiplexin |
April 4, 2006 |
| A synchronization of a pilot assisted channel estimation orthogonal frequency division multiplexing can be achieved by receiving a signal containing pilot symbols, providing an initial time and frequency synchronization to the signal, phase rotating the signal across time, transformi |
| 6990324 |
Methods and apparatus for selecting between multiple carriers using a single receiver chain tune |
January 24, 2006 |
| Receivers accommodating carrier frequency selection methods in wireless communications systems employing multiple carrier frequencies are described. Although the receiver is tuned to a single band, an estimate of the channel quality corresponding to the currently used carrier and an |
| 6985498 |
Beacon signaling in a wireless system |
January 10, 2006 |
| A few high power tones used for synchronization and/or other purposes are transmitted in a FDM system during a period of time, e.g., a symbol transmission time period. During normal data transmission symbol periods signals are transmitted using at least 10 tones, e.g., per symbol time. |
| 6961595 |
Methods and apparatus for operating mobile nodes in multiple states |
November 1, 2005 |
| The use of multiple states of mobile communication device operation to allow a single base station to support a relatively large number of mobile nodes is described. Various states require different amounts of communications resources, e.g., bandwidth and/or control signaling. Differ |
| 6788963 |
Methods and apparatus for operating mobile nodes in multiple a states |
September 7, 2004 |
| The use of multiple states of mobile communication device operation to allow a single base station to support a relatively large number of mobile nodes is described. The various states require different amounts of communications resources, e.g., bandwidth. Four supported states of op |
