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18 records (took 0.021 seconds)

    1.
    发明专利
    未知

    公开(公告)号：AT517356T

    公开(公告)日：2011-08-15

    申请号：AT02737486

    申请日：2002-06-11

    Applicant: ATHEROS COMM INC

    Inventor： MCFARLAND WILLIAM ,  ZENG CHAOHUANG ,  DHAMDHERE DEEPAK

    IPC: G01S7/02 ,  H04L12/56 ,  H04L12/28 ,  H04W24/00 ,  H04W28/04 ,  H04W72/02 ,  H04W84/12

    Abstract: A system for detecting and avoiding interference with radar signals in wireless network devices is described. The receiver circuit of the device receives incoming 5 GHz traffic. Such traffic could comprise both WLAN traffic as well as radar signals from radar systems. The incoming packets are treated as an input event, and are screened to be examined as radar pulses. Radar pulses are identified using the length of the detected event. The radar pulses are examined using frequency domain analysis, and the packet train is examined to find gaps between radar pulses. The periodic nature of the packet is determined using frequency domain and time domain analysis to calculate the period of the pulse train. Particular intervals within the pulse train are analyzed using threshold numbers of periodic pulses within the interval and threshold power levels for the pulses. The calculated period information is used to identify the radar source and screen non-radar traffic.

    4.
    发明专利
    未知

    公开(公告)号：DE60233482D1

    公开(公告)日：2009-10-08

    申请号：DE60233482

    申请日：2002-03-28

    Applicant: ATHEROS COMM INC

    Inventor： TEHRANI ARDAVAN MALEKI ,  MCFARLAND WILLIAM

    IPC: H04B7/06 ,  H04B7/08 ,  H04L12/28 ,  H04L12/56

    Abstract: An antenna switch diversity algorithm, and systems and methods to provide antenna diversity by implementing the algorithm in, for example, an IEEE 802.11a compliant environment, are presented. In accordance with the algorithm, one antenna of at least two antennas is designated as a default antenna at a communications device that sends and receives transmit and receive packets. The default antenna designation is changed depending on long-term and short-term learning processes implemented in, for example, software and hardware. The long-term and short-term learning processes analyze packet transmission and reception results of the antennas. The antenna switch diversity algorithm is applicable to multiple antennas.

    Multi-carrier communication systems employing variable symbol rates and number of carriers
    6.
    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.

    MULTI-CARRIER COMMUNICATION SYSTEMS EMPLOYING VARIABLE OFDM-SYMBOL RATES AND NUMBER OF CARRIERS
    8.
    发明申请
    MULTI-CARRIER COMMUNICATION SYSTEMS EMPLOYING VARIABLE OFDM-SYMBOL RATES AND NUMBER OF CARRIERS 审中-公开
    使用可变OFDM符号速率和载波数量的多载波通信系统

    公开(公告)号：WO0182543A3

    公开(公告)日：2002-02-28

    申请号：PCT/US0112866

    申请日：2001-04-20

    Applicant: ATHEROS COMM INC

    Inventor： MCFARLAND WILLIAM

    IPC: H04L27/26

    CPC classification number: H04W28/0231 ,  H04L1/0002 ,  H04L1/0017 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/20 ,  H04L5/0007 ,  H04L5/003 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0064 ,  H04L25/0224 ,  H04L25/08 ,  H04L27/2602 ,  H04L27/2608 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2628

    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 carriers used. The selection of symbol rate and number of carriers 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 carriers 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.

    Abstract translation: 诸如OFDM或DMT系统的多载波通信系统具有被允许动态地改变其接收和发送符号率的节点以及它们的信号内的载波数量。 通过改变节点iFFT和FFT处理器的时钟频率，以及它们的串行器和解串器来改变符号速率。 节点具有动态地改变所使用的载波数量的几种方式。 可以基于明确的信道测量，信道的先验知识或过去的经验，针对给定信道优化符号速率和载波数量的选择。 规定了用于容纳可能具有符号率限制或可支持的运营商数量的传统节点。 接收机可以通过先验知识确定正确的符号速率和载波数，以所有节点可以理解的基本模式的分组的第一次交换，或以基本模式发送的数据分组的报头中的指示 所有节点都可以理解的操作。

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