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    • 4. 发明授权
    • Power saving mechanism for wireless LANs via schedule information vector
    • 无线局域网的节电机制通过时间表信息向量
    • US07508781B2
    • 2009-03-24
    • US10396921
    • 2003-03-25
    • Yonghe LiuJin-Meng HoMatthew B. Shoemake
    • Yonghe LiuJin-Meng HoMatthew B. Shoemake
    • G08C17/00
    • H04W52/0216H04W72/12H04W74/06H04W84/12H04W88/08Y02D70/142Y02D70/144Y02D70/22
    • A new protocol system and method is described that utilizes a Schedule Information Vector (SIV) protocol for saving power in wireless local area networks. The protocol includes an access point, one or more stations, and an SIV frame including an association ID for identifying one of the stations and a scheduled wake-up time for the identified station. The access point originates and transmits the SIV frame protocol of the scheduled wake-up time to the stations. The SIV frame protocol of the wireless network is further operable to dynamically adjust the scheduled wake-up times of the stations, a sequence of the wake-up times, a periodic wake-up time, a plurality of wake-up times, and a duration of the wake-up times of the stations. These adjustments may be made based on network traffic, traffic buffering times, data priorities, data length, and data rates.
    • 描述了一种新的协议系统和方法,其利用计划信息向量(SIV)协议来节省无线局域网中的功率。 该协议包括接入点,一个或多个站,以及SIV帧,其包括用于识别站中的一个的关联ID以及所识别的站的预定的唤醒时间。 接入点将预定的唤醒时间的SIV帧协议发送到站。 无线网络的SIV帧协议还可用于动态地调整站的调度的唤醒时间,唤醒时间的顺序,周期性的唤醒时间,多个唤醒时间和 车站唤醒时间的持续时间。 这些调整可以基于网络流量,流量缓冲时间,数据优先级,数据长度和数据速率进行。
    • 5. 发明授权
    • Wireless communications system using both licensed and unlicensed frequency bands
    • 使用许可和非许可频带的无线通信系统
    • US07400903B2
    • 2008-07-15
    • US10413648
    • 2003-04-15
    • Matthew B. ShoemakeCarl M. PanasikJie Liang
    • Matthew B. ShoemakeCarl M. PanasikJie Liang
    • H04M1/00
    • H04W72/02H04W4/12H04W28/18H04W48/16
    • A communications system including devices (10, 20) for transmitting and receiving wireless communications over licensed and unlicensed bands is disclosed. On the transmit side, a device (10) includes a plurality of message sources (8A, 8B, 8C) and a smart router (12) function executed by a processor (30) within the device. The smart router (12) function allocates each wireless transmission, or components of a multicomponent wireless transmission, over a licensed wireless link (LLTX) or an unlicensed wireless link (ULTX), by optimizing various factors. The allocation factors include the availability of the unlicensed and licensed channels within range of the transmitting device (10); quality of service parameters such as time delay limits, jitter limits, bandwidth requirements, and the like; cost tolerance and cost per minute factors; power consumption expectations; and a combination of these and other factors. Transmission of the wireless message over the selected wireless links is then carried out. A receiving device (20) may include a smart receiver (22) that resequences the components of a multicomponent transmission for forwarding to output functions (24A, 24B, 24C) of the receiving device (20).
    • 公开了一种通信系统,包括用于通过许可和非授权频带发送和接收无线通信的设备(10,20)。 在发送侧,设备(10)包括由设备内的处理器(30)执行的多个消息源(8A,8B,8C)和智能路由器(12)功能。 智能路由器(12)功能通过优化各种因素来分配许可无线链路(LLTX)或非许可无线链路(ULTX)上的每个无线传输或多组件无线传输的组件。 分配因素包括在发射设备(10)的范围内的无许可和许可频道的可用性; 服务质量参数如延时限制,抖动限制,带宽要求等; 成本容差和每分钟成本因素; 功耗预期; 以及这些因素的组合。 然后执行通过所选择的无线链路的无线消息的传输。 接收设备(20)可以包括智能接收器(22),其将多分组传输的组件重新排序以转发到接收设备(20)的输出功能(24A,24B,24C)。
    • 6. 发明授权
    • Adaptive adjustment of backoff times in wireless network communications
    • 无线网络通信中退避时间的自适应调整
    • US07209467B2
    • 2007-04-24
    • US10304973
    • 2002-11-26
    • Yonghe LiuMatthew B. ShoemakeJin-Meng Ho
    • Yonghe LiuMatthew B. ShoemakeJin-Meng Ho
    • H04Q7/24H04J3/00H04B7/212H04L12/413
    • H04W74/085H04W74/006H04W74/0833H04W84/12
    • A wireless network, including a plurality of network elements such as a wireless access point (9), and computer stations (2, 4, 6), is disclosed. The wireless network operates so that each network element (2, 4, 6, 9) waits for a pseudo-randomly selected duration, after the end of a frame on the channel, before initiating transmission. One of the network elements, such as the wireless access point (9), measures the performance of the network over a measurement period (T), and adjusts a minimum value of the upper limit of the range from which the random duration is selected, according to the performance of the network over the measurement period. The times measured may be the successful transmission time (Ts), which is maximized in adjusting the minimum value, or the idle and collision times (T1, Tc), which are equated in the optimization of the minimum value.
    • 公开了一种包括诸如无线接入点(9)和计算机站(2,4,6)之类的多个网络元件的无线网络。 无线网络操作,使得每个网络元件(2,4,6,9)在开始传输之前在信道上的帧结束之后等待伪随机选择的持续时间。 诸如无线接入点(9)的网络元件之一在测量周期(T)测量网络的性能,并且调整选择随机持续时间的范围的上限的最小值, 根据网络在测量期间的表现。 所测量的时间可以是在调整最小值时最大化的传输时间(T SUB),或空闲和冲突时间(T 1 SUB,T c ),它们在最小值的优化中相等。
    • 9. 发明授权
    • Detection and mitigation of interference and jammers in an OFDM system
    • 检测和减轻OFDM系统中的干扰和干扰
    • US08144572B2
    • 2012-03-27
    • US11226654
    • 2005-09-14
    • Matthew B. ShoemakeSridhar RajagopalJohn D. Terry
    • Matthew B. ShoemakeSridhar RajagopalJohn D. Terry
    • H04J11/00
    • H04B17/345
    • The present invention provides a method and apparatus for detecting interference in a wireless communications system. The invention compares the receiver FFT output of a received signal against known sequences such as the packet synchronization sequence, frame synchronization sequence, and channel estimation sequence. By comparing the reference signal to the known sequences, the invention estimates the instantaneous signal to noise ratio (SNR) for each tone of a wireless transmission. To improve the SNR estimate, the invention computes a weighted average across multiple OFDM symbols. The invention looks for significant increases (spikes) in the SNR as a way of distinguishing interfering signals from noise. The invention can store separate SNR estimates for each transmitter in a wireless network. One embodiment of the invention uses Viterbi branch metrics in conjunction with the estimated SNR to determine the presence of an interfering signal. If interference is detected the invention feeds the inverse of the SNR estimate into the Viterbi decoder or declares and erasure for that symbol.
    • 本发明提供一种用于检测无线通信系统中的干扰的方法和装置。 本发明将接收信号的接收机FFT输出与诸如分组同步序列,帧同步序列和信道估计序列的已知序列进行比较。 通过将参考信号与已知序列进行比较,本发明估计无线传输的每个音调的瞬时信噪比(SNR)。 为了提高SNR估计,本发明计算跨多个OFDM符号的加权平均。 本发明寻找SNR中的显着增加(尖峰)作为区分干扰信号和噪声的一种方式。 本发明可以在无线网络中为每个发射机存储单独的SNR估计。 本发明的一个实施例使用维特比分支度量结合估计的SNR来确定干扰信号的存在。 如果检测到干扰,本发明将SNR估计的逆向馈送到维特比解码器中,或者声明并擦除该符号。