Multi-layer differential phase shift keying with bit-interleaved coded modulation and OFDM
    1.
    发明授权
    Multi-layer differential phase shift keying with bit-interleaved coded modulation and OFDM 失效
    具有位交织编码调制和OFDM的多层差分相移键控

    公开(公告)号:US07324613B2

    公开(公告)日:2008-01-29

    申请号:US10721533

    申请日:2003-11-25

    IPC分类号: H03D3/22 H04K1/10

    摘要: An efficient system and method for modulation and demodulation to achieve a high data rate using Bit-Interleaved Coded Modulation and OFDM uses either a coherent or a non-coherent transmission scheme using differential modulation. In order to maintain a high data rate impervious to sudden phase changes, a communication system uses an efficient constellation having multiple rings with different sizes and modulation/demodulation schemes utilizing this constellation. In power line communications, the channel gain information is obtained easily at a receiver (100) while the phase information is not. Thus, the communication system uses an absolute magnitude and differential phase coding for modulation and demodulation of the signals.

    摘要翻译: 用于使用比特交错编码调制实现高数据速率的调制和解调的有效系统和方法使用差分调制使用相干或非相干传输方案。 为了保持突发相位变化的高数据速率,通信系统使用具有不同大小的多个环的有效星座和利用该星座的调制/解调方案。 在电力线通信中,在相位信息不是在接收器(100)处容易地获得信道增益信息。 因此,通信系统使用绝对幅度和差分相位编码来进行信号的调制和解调。

    Channel estimation and synchronization with preamble using polyphase code
    2.
    发明授权
    Channel estimation and synchronization with preamble using polyphase code 失效
    使用多相码的信道估计和前同步码同步

    公开(公告)号:US07453794B2

    公开(公告)日:2008-11-18

    申请号:US10737339

    申请日:2003-12-16

    IPC分类号: H04J11/00

    摘要: A preamble for an OFDM signal synchronizes (104) and estimates (106) the sub-channels with only one code. One polyphase code sequence is used repeatedly for the preamble. The preamble is spread out over the bandwidth, which is the same as an OFDM symbol in the frequency domain and has good autocorrelation characteristics in the time domain. All OFDM signals are added with this preamble at the beginning of the OFDM signal and transmitted on the channel at a transmitter (50). At the receiving end, the receiver (100) first does the autocorrelation process to find out a peak value for synchronization in the time domain. Then, since the polyphase code is known at the receiver, the signal to noise ratio for each sub-carrier is calculated in the frequency domain and smoothed using the normal (Gaussian) distribution to provide the channel estimation. Since the synchronization and channel estimation are processed with a single preamble, the overhead for these two functions is significantly reduced.

    摘要翻译: OFDM信号的前导码同步(104)并仅使用一个码估计(106)子信道。 对于前同步码重复使用一个多相码序列。 前导码在带宽上扩展,与频域中的OFDM符号相同,并且在时域中具有良好的自相关特性。 所有OFDM信号在OFDM信号的开始处与该前同步码相加,并在发射机(50)的信道上发送。 在接收端,接收机(100)首先进行自相关处理,以找出在时域中同步的峰值。 然后,由于在接收机处已知多相码,所以在频域中计算每个子载波的信噪比并使用正态(高斯)分布进行平滑,以提供信道估计。 由于使用单个前同步码来处理同步和信道估计,所以这两个功能的开销显着降低。

    Coordinated directional medium access control in a wireless network
    3.
    发明申请
    Coordinated directional medium access control in a wireless network 审中-公开
    无线网络中的协调定向介质访问控制

    公开(公告)号:US20060209772A1

    公开(公告)日:2006-09-21

    申请号:US11080041

    申请日:2005-03-15

    IPC分类号: H04Q7/24

    CPC分类号: H04W84/20 H04W16/30 H04W74/02

    摘要: A method of simultaneously transmitting and receiving multiple data packets over wireless channels among the nodes of a wireless network is provided. The method includes automatically selecting a master sending node and corresponding master receiving node in response to an omni-directionally transmitted request to send during a contention period. The method also includes selecting a slave sending node and corresponding slave receiving node if a spatial reuse ratio correspond to the master-node pair is less than a predetermined threshold and if directional data transmissions between the slave sending node and corresponding slave receiving node avoid interfering with directional data transmissions between the master nodes and other pairs of slave nodes. The method further includes causing the master sending node and slave sending node to directionally transmit data packets during a coordination period.

    摘要翻译: 提供了一种在无线网络的节点之间通过无线信道同时发送和接收多个数据分组的方法。 所述方法包括:响应于在竞争期间发送的全方向发送的请求,自动选择主发送节点和相应的主接收节点。 该方法还包括如果对应于主节点对的空间复用比率小于预定阈值,则选择从发送节点和对应的从接收节点,并且如果从发送节点和对应的从接收节点之间的定向数据传输避免干扰 主节点与其他从属节点对之间的方向数据传输。 该方法还包括使主发送节点和从发送节点在协调周期期间定向发送数据分组。

    VOLUNTEER SEARCH SYSTEM. VOLUNTEER SEARCH SERVER AND SEARCH METHOD THEREOF
    4.
    发明申请
    VOLUNTEER SEARCH SYSTEM. VOLUNTEER SEARCH SERVER AND SEARCH METHOD THEREOF 审中-公开
    志愿者搜索系统。 志愿者搜索服务器及其搜索方法

    公开(公告)号:US20110106820A1

    公开(公告)日:2011-05-05

    申请号:US12609911

    申请日:2009-10-30

    IPC分类号: G06F17/30

    CPC分类号: G06Q30/02 G06F16/9537

    摘要: The present invention discloses a volunteer search server, comprising a receiver, a database, an analyzer and a transmitter. The receiver is for receiving a request message from a requester, wherein the request message contains the location information of the requester. The database is for storing a matching mechanism and the location information of a plurality of volunteers. The analyzer is for exercising the matching mechanism to search at least one suitable volunteer according to the request message, wherein the matching mechanism considers both the location information of the requester and the volunteer. The transmitter is for transmitting a designate message to one designated volunteer. Additionally, the present invention discloses a search method of the volunteer search server and a volunteer search system thereof.

    摘要翻译: 本发明公开了一种志愿者搜索服务器,包括接收机,数据库,分析器和发射机。 接收机用于从请求者接收请求消息,其中请求消息包含请求者的位置信息。 数据库用于存储多个志愿者的匹配机制和位置信息。 所述分析器用于根据所述请求消息来行使所述匹配机制以搜索至少一个合适的志愿者,其中所述匹配机制考虑所述请求者的位置信息和所述志愿者。 发射机用于向一个指定的志愿者发送指定消息。 此外,本发明公开了一种志愿者搜索服务器的搜索方法及其志愿者搜索系统。

    Multi-layer differential phase shift keying with bit-interleaved coded modulation and OFDM
    5.
    发明申请
    Multi-layer differential phase shift keying with bit-interleaved coded modulation and OFDM 失效
    具有位交织编码调制和OFDM的多层差分相移键控

    公开(公告)号:US20050111590A1

    公开(公告)日:2005-05-26

    申请号:US10721533

    申请日:2003-11-25

    IPC分类号: H04L27/20 H04L27/22

    摘要: An efficient system and method for modulation and demodulation to achieve a high data rate using Bit-Interleaved Coded Modulation and OFDM uses either a coherent or a non-coherent transmission scheme using differential modulation. In order to maintain a high data rate impervious to sudden phase changes, a communication system uses an efficient constellation having multiple rings with different sizes and modulation/demodulation schemes utilizing this constellation. In power line communications, the channel gain information is obtained easily at a receiver (100) while the phase information is not. Thus, the communication system uses an absolute magnitude and differential phase coding for modulation and demodulation of the signals.

    摘要翻译: 用于使用比特交错编码调制实现高数据速率的调制和解调的有效系统和方法使用差分调制使用相干或非相干传输方案。 为了保持突发相位变化的高数据速率,通信系统使用具有不同大小的多个环的有效星座和利用该星座的调制/解调方案。 在电力线通信中,在相位信息不是在接收器(100)处容易地获得信道增益信息。 因此,通信系统使用绝对幅度和差分相位编码来进行信号的调制和解调。

    SYSTEM AND METHOD OF DETECTING AIR POLLUTION, ROUTE-PLANNING METHOD APPLIED TO SAID DETECTION SYSTEM, AND WARNING METHOD OF AIR POLLUTION
    6.
    发明申请
    SYSTEM AND METHOD OF DETECTING AIR POLLUTION, ROUTE-PLANNING METHOD APPLIED TO SAID DETECTION SYSTEM, AND WARNING METHOD OF AIR POLLUTION 审中-公开
    检测空气污染的系统和方法,应用于检测系统的路由规划方法和警告空气污染方法

    公开(公告)号:US20090309744A1

    公开(公告)日:2009-12-17

    申请号:US12408241

    申请日:2009-03-20

    IPC分类号: G08B17/10 G06F19/00 G01W1/02

    摘要: Provided are a system and method for detecting air pollution, characterized by using an air pollution detecting device for detecting air pollutants, using a positioning device for locating the air pollution detecting device, and enabling a data transmission device to transmit air pollution data and position data to a data analysis and management device via a network system, and then enabling the data analysis and management device to perform analysis and management process on the data; accordingly, perceiving air pollution status at each area and thus proving air pollution information and improvement to air pollution areas in a shorter time.

    摘要翻译: 提供一种用于检测空气污染的系统和方法,其特征在于使用空气污染检测装置检测大气污染物,使用定位装置定位空气污染检测装置,并使数据传输装置能够传输空气污染数据和位置数据 通过网络系统到数据分析和管理设备,然后使数据分析和管理设备对数据执行分析和管理过程; 相应地,感知各地区的空气污染状况,从而在较短的时间内证明空气污染信息和改善空气污染地区。

    Medium access control in wireless local area networks with multi-beam access point
    7.
    发明申请
    Medium access control in wireless local area networks with multi-beam access point 审中-公开
    具有多波束接入点的无线局域网中的媒体接入控制

    公开(公告)号:US20060268760A1

    公开(公告)日:2006-11-30

    申请号:US11131103

    申请日:2005-05-17

    IPC分类号: H04Q7/00

    CPC分类号: H04W74/0816

    摘要: A method for conveying digitally encoded data within a Wireless Local Area Network (WLAN) using a contention based Media Access Control (MAC) protocol. In the method, a multi-beam access point can transmit a channel contention request and responsively receive channel contention responses. A set of nodes can be determined based upon the channel contention responses. Each node of the determined set can be assigned one beam of the multi-beam access point. The nodes can use the assigned beams to simultaneously communicate with said multi-beam access point in a collision-free fashion along an assigned beam.

    摘要翻译: 一种使用基于竞争的媒体访问控制(MAC)协议在无线局域网(WLAN)内传送数字编码数据的方法。 在该方法中,多波束接入点可以发送信道争用请求并且响应地接收信道争用响应。 可以基于信道争用响应来确定一组节点。 可以将所确定的集合的每个节点分配给多个波束接入点的一个波束。 节点可以使用分配的波束,以沿着分配的波束以无碰撞的方式同时与所述多波束接入点进行通信。

    Channel estimation and synchronization with preamble using polyphase code
    8.
    发明申请
    Channel estimation and synchronization with preamble using polyphase code 失效
    使用多相码的信道估计和前同步码同步

    公开(公告)号:US20050128938A1

    公开(公告)日:2005-06-16

    申请号:US10737339

    申请日:2003-12-16

    IPC分类号: H04J11/00 H04L25/02 H04L27/26

    摘要: A preamble for an OFDM signal synchronizes (104) and estimates (106) the sub-channels with only one code. One polyphase code sequence is used repeatedly for the preamble. The preamble is spread out over the bandwidth, which is the same as an OFDM symbol in the frequency domain and has good autocorrelation characteristics in the time domain. All OFDM signals are added with this preamble at the beginning of the OFDM signal and transmitted on the channel at a transmitter (50). At the receiving end, the receiver (100) first does the autocorrelation process to find out a peak value for synchronization in the time domain. Then, since the polyphase code is known at the receiver, the signal to noise ratio for each sub-carrier is calculated in the frequency domain and smoothed using the normal (Gaussian) distribution to provide the channel estimation. Since the synchronization and channel estimation are processed with a single preamble, the overhead for these two functions is significantly reduced.

    摘要翻译: OFDM信号的前导码同步(104)并仅使用一个码估计(106)子信道。 对于前同步码重复使用一个多相码序列。 前导码在带宽上扩展,与频域中的OFDM符号相同,并且在时域中具有良好的自相关特性。 所有OFDM信号在OFDM信号的开始处与该前同步码相加,并在发射机(50)的信道上发送。 在接收端,接收机(100)首先进行自相关处理,以找出在时域中同步的峰值。 然后,由于在接收机处已知多相码,所以在频域中计算每个子载波的信噪比并使用正态(高斯)分布进行平滑,以提供信道估计。 由于使用单个前同步码来处理同步和信道估计,所以这两个功能的开销显着降低。