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    Method and apparatus for a transceiver having a constant power output
    72.
    发明专利
    Method and apparatus for a transceiver having a constant power output 未知

    公开(公告)号：AU2002245150A1

    公开(公告)日：2002-08-28

    申请号：AU2002245150

    申请日：2001-12-17

    Applicant: ATHEROS COMM INC

    Inventor： KACZYNSKI BRIAN J

    IPC: H03G3/30 ,  H04B1/04 ,  H04B7/005 ,  H04L12/56 ,  H03G1/00

    Abstract: A transceiver includes a power control circuit in the transmitter that operates on a packet-by-packet basis. The transceiver can, for each packet, set a variable gain amplifier to a first gain and use predetermined gain increments to thereafter increase gain until a gain hold event. The gain hold event can be an expiration of a time duration allocated for changing gain or a desired power being reached, whichever event occurs first. The gain can be adjusted by a predetermined amount based on an operating condition.

    Multi-carrier communication systems employing variable symbol rates and number of carriers
    74.
    发明专利
    Multi-carrier communication systems employing variable symbol rates and number of carriers 未知

    公开(公告)号：AU5713301A

    公开(公告)日：2001-11-07

    申请号：AU5713301

    申请日：2001-04-20

    Applicant: ATHEROS COMM INC

    Inventor： MCFARLAND WILLIAM

    IPC: H04L27/26 ,  H04L27/00

    Abstract: A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their signals. Changing of the symbol rate is done by changing the clocking frequency of the nodes' iFFT and FFT processors, as well as their serializers and deserializers. The nodes have several ways of dynamically changing the number of earners used. The selection of symbol rate and number of earners can be optimized for a given channel based on explicit channel measurements, a priori knowledge of the channel, or past experience. Provision is made for accommodating legacy nodes that may have constraints in symbol rate or the number of carriers they can support. The receiver can determine the correct symbol rate and number of earners through a priori knowledge, a first exchange of packets in a base mode that all nodes can understand, or an indication in the header of the data packet which is transmitted in a base mode of operation that all nodes can understand.

    METHOD AND APPARATUS FOR TIMING CONTROL IN DIGITAL COMMUNICATION SYSTEMS
    78.
    发明专利
    METHOD AND APPARATUS FOR TIMING CONTROL IN DIGITAL COMMUNICATION SYSTEMS 未知

    公开(公告)号：CA2388040A1

    公开(公告)日：2001-04-26

    申请号：CA2388040

    申请日：2000-10-17

    Applicant: ATHEROS COMM INC

    Inventor： MENG TERESA H

    IPC: H04B1/707 ,  H04B7/26 ,  H04L7/04 ,  H04L12/56

    Abstract: The present invention provides an apparatus and method for detecting the relative time of arrival of different signals at a single receiver from different respective transmitters, and causing the different respective transmitters to alter the time that they transmit their signals so that the time of arrival of signals from different transmitters is within a predetermined period. The present invention uses either a closed loop timing control, a GPS based timing control, or an open loop based timing control, t o determine the time that signals from different transmitters need to be alter ed in order to obtain time of arrival for different signals within the predetermined period. As a result of the arriving signals being "semi- synchronous", any detection algorithms taking advantage of time synchronism, for example multi-user detection or interference rejection, can be much more effective in signal detection for the data transmitted from multiple transmitters to a single receiver.

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