Patent application number | Description | Published |
20080240001 | Time division duplex wireless network and associated method using modulation groups - A transceiver for use in a wireless access network comprising a plurality of base stations, each of the plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at a plurality of subscriber premises in a corresponding cell site of the wireless access network. The transceiver is associated with a first base station and comprises transmit path circuitry associated with a beam forming network for transmitting directed scanning beam signals in a sector of a cell site of the first base station. The transmit path circuitry transmits at a start of a TDD frame a broadcast beam signal comprising a start of frame field and subsequently transmits downlink data traffic in a downlink portion of the TDD frame to at least one of the wireless access devices using at least one directed scanning beam. | 10-02-2008 |
20080279123 | Time division duplex wireless network and associated method using connection modulation groups - A wireless network is provided that includes a base station and subscriber stations that communicate with the base station using radio frequency (RF) time division duplex (TDD) signaling. The base station may establish medium access control (MAC) connections with each station. The base station monitors communications with the stations and, in accordance, assigns stations or MAC connections to modulation groups. The base station transmits signals on MAC connections or to stations in a modulation group in adjacent TDD slots within a TDD frame. The base station may receive access requests from the stations, evaluate traffic requirements for the stations, and determine a longest downlink portion for the stations. The base station then allocates downlink and uplink portions of a TDD frame according to the length of the longest downlink portion. | 11-13-2008 |
20090285134 | Wireless access system using multiple modulation formats in TDD frames and method of operation - There is disclosed a radio frequency (RF) modem shelf for use in a fixed wireless access network comprising a plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at a plurality of subscriber premises. The radio frequency (RF) modem shelf comprises: a) a first RF modem for communicating with a plurality of the wireless access devices using TDD frames, each TDD frame having an uplink for receiving data and a downlink for transmitting data; and b) a modulation controller associated with the RF modem shelf for determining an optimum modulation configuration for each of the plurality of wireless access devices communicating with the first RF modem. The modulation controller causes the first RF modem to transmit downlink data to a first wireless access device in a first data, block having a first optimum modulation configuration and to transmit downlink data to a second wireless access device in a second data block having a different second optimum modulation configuration. | 11-19-2009 |
20110013685 | Channel and Equalization Coefficient Based Timing Recovery - A module and method for channel estimate and equalization coefficient based timing recovery comprises a timing estimation module, two channel estimation modules communicably coupled to the timing estimation module, an equalization coefficient computation module communicably coupled to the timing estimation module and one of the channel estimation modules, a conversion module communicably coupled to the timing estimation module and to the two channel estimation modules, and a pulse shaping filter communicably coupled to the conversion module, wherein: the pulse shaping filter receives a signal and outputs a filtered signal, the conversion module receives the filtered signal and outputs two 1/T rate signal streams, a sample time=t stream and a sample time=t−Ω stream where Ω is small compared to T, with each stream going to one of the two channel estimation modules, the channel estimation modules each output a 1/T Channel Impulse Response (CIR) estimate to the timing estimation module, the equalization coefficient computation module receives the CIR estimate from the channel estimation module that receives the sample time=t signal stream and outputs the equalization coefficients to the timing estimation module, and the timing estimation module outputs a timing offset parameter to the conversion module, wherein the timing offset parameter is used in conjunction with the output of the pulse shaping filter to provide two 1/T rate signal streams. | 01-20-2011 |
20120188901 | Time division duplex wireless network and associated method using connection modulation groups - A wireless network is provided that includes a base station and subscriber stations that communicate with the base station using radio frequency (RF) time division duplex (TDD) signaling. The base station may establish medium access control (MAC) connections with each station. The base station monitors communications with the stations and, in accordance, assigns stations or MAC connections to modulation groups. The base station transmits signals on MAC connections or to stations in a modulation group in adjacent TDD slots within a TDD frame. The base station may receive access requests from the stations, evaluate traffic requirements for the stations, and determine a longest downlink portion for the stations. The base station then allocates downlink and uplink portions of a TDD frame according to the length of the longest downlink portion. | 07-26-2012 |
20120281598 | Wireless access system using multiple modulation formats in TDD frames and method of operation - A radio frequency (RF) modem shelf for use in a fixed wireless access network comprising, a plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at subscriber premises. The shelf comprises: a) a first RF modem for communicating with wireless access devices using TDD frames, each TDD frame having an uplink for, receiving data and a downlink for transmitting data; and b) a modulation controller associated with the RF modem shelf for determining an optimum modulation configuration for each of the wireless access devices communicating with the first RF modem. The controller causes the first RF modem to transmit downlink data to a first wireless access device in a first data block having a first optimum modulation configuration and to transmit downlink data to a second wireless access device in a second data block having a different second optimum modulation configuration. | 11-08-2012 |
20130266098 | MULTIPLE SIGNAL TIMING CONTROL FOR JOINT DETECTION INTERFERENCE CANCELLATION - A module and method for a joint detection interference cancellation receiver with the multiple signal timing control and interference cancellation timing control. The invention provides a means of performing interference cancellation for signals that are asynchronous with respect to each other while enabling signal synchronous processing of the individual signals. The present invention can be utilized with wireless signals that posses a signal format defining a fixed timing interval and a frame structure. | 10-10-2013 |
20130266099 | MULTIPLE SIGNAL TIMING CONTROL FOR JOINT DETECTION INTERFERENCE CANCELLATION - A module and method for a joint detection interference cancellation receiver with the multiple signal timing control and interference cancellation timing control. The invention provides a means of performing interference cancellation for signals that are asynchronous with respect to each other while enabling signal synchronous processing of the individual signals. The present invention can be utilized with wireless signals that posses a signal format defining a fixed timing interval and a frame structure. | 10-10-2013 |