公开(公告)号：US20100248760A1

公开(公告)日：2010-09-30

申请号：US12727906

申请日：2010-03-19

申请人： Dongdong Li ,  Dandan Wang ,  Mazin Al-Shalash ,  Anthony C.K. Soong ,  Guodong Zhao ,  Chenyang Yang

发明人： Dongdong Li ,  Dandan Wang ,  Mazin Al-Shalash ,  Anthony C.K. Soong ,  Guodong Zhao ,  Chenyang Yang

IPC分类号： H04B7/00

CPC分类号： H04W74/0808 ,  H04W16/14

摘要： A system and method for cooperative spectrum sensing in cognitive radio (CR) systems is provided. A method for CR user operation includes coordinating with partner CR users to share spectrum sensing information, combining spectrum sensing information from partner CR users, and determining if a transmission opportunity exists based on the combined spectrum sensing information. The method also includes transmitting a message to a CR user if the transmission opportunity exists, and storing the message if the transmission opportunity does not exist.

摘要翻译： 提供了一种用于认知无线电（CR）系统中协作频谱感知的系统和方法。 用于CR用户操作的方法包括与伙伴CR用户协调以共享频谱感测信息，组合来自伙伴CR用户的频谱感测信息，以及基于组合的频谱感测信息来确定是否存在传输机会。 该方法还包括如果传输机会存在则向CR用户发送消息，如果发送机会不存在则存储该消息。

公开(公告)号：US08442567B2

公开(公告)日：2013-05-14

申请号：US12727906

申请日：2010-03-19

申请人： Dongdong Li ,  Dandan Wang ,  Mazin Al-Shalash ,  Anthony C. K. Soong ,  Guodong Zhao ,  Chenyang Yang

发明人： Dongdong Li ,  Dandan Wang ,  Mazin Al-Shalash ,  Anthony C. K. Soong ,  Guodong Zhao ,  Chenyang Yang

IPC分类号： H04W72/00 ,  H04B17/00 ,  H04B7/00

CPC分类号： H04W74/0808 ,  H04W16/14

摘要： A system and method for cooperative spectrum sensing in cognitive radio (CR) systems is provided. A method for CR user operation includes coordinating with partner CR users to share spectrum sensing information, combining spectrum sensing information from partner CR users, and determining if a transmission opportunity exists based on the combined spectrum sensing information. The method also includes transmitting a message to a CR user if the transmission opportunity exists, and storing the message if the transmission opportunity does not exist.

摘要翻译： 提供了一种用于认知无线电（CR）系统中协作频谱感知的系统和方法。 用于CR用户操作的方法包括与伙伴CR用户协调以共享频谱感测信息，组合来自伙伴CR用户的频谱感测信息，以及基于组合的频谱感测信息来确定是否存在传输机会。 该方法还包括如果传输机会存在则向CR用户发送消息，如果发送机会不存在则存储该消息。

公开(公告)号：US20050202795A1

公开(公告)日：2005-09-15

申请号：US10422321

申请日：2003-04-24

申请人： YaFei Tian ,  Chenyang Yang ,  Feng Wu ,  Liang Zhang ,  Liang Li ,  Noi Banavong

发明人： YaFei Tian ,  Chenyang Yang ,  Feng Wu ,  Liang Zhang ,  Liang Li ,  Noi Banavong

IPC分类号： H04L27/00 ,  H04B1/16 ,  H04B1/06 ,  H04B7/00

CPC分类号： H04L27/00 ,  H04W4/18 ,  H04W56/00 ,  H04W88/06

摘要： A baseband process operating on a receiver in a communication system, such as an 802.15.4 communication system, is provided. The baseband process has a set of predefined reference signals, with each reference signal associated with a possible characteristic in the baseband signal. The baseband process receives a degraded baseband signal, and preprocesses the baseband signal to reduce or remove the effects of the degradation. The preprocessed baseband signal is correlated with reference signals from the set of predefined reference signals, and the reference signal with the best correlation is identified. By identifying the best correlating reference signal, the baseband process is able to identify a characteristic of the baseband signal. In one example of the baseband process, the baseband signal is preprocessed by auto-correlating the degraded baseband signal with a delayed version of the degraded baseband signal. The preprocessed baseband signal is then correlated against a set of sync reference signals to find a sync offset for the baseband signal. When synchronized with the baseband signal, the baseband process may be correlated against a set of symbol reference signals to decode sequential symbols in the baseband signal.

摘要翻译： 提供了在诸如802.15.4通信系统的通信系统中的接收机上操作的基带处理。 基带处理具有一组预定义的参考信号，每个参考信号与基带信号中的可能特性相关联。 基带处理接收降级的基带信号，并预处理基带信号以减少或消除降级的影响。 预处理的基带信号与来自预定参考信号的参考信号相关，并且识别具有最佳相关性的参考信号。 通过识别最佳相关参考信号，基带处理能够识别基带信号的特性。 在基带处理的一个示例中，通过将劣化的基带信号与降级的基带信号的延迟版本自相关来对基带信号进行预处理。 然后将预处理的基带信号与一组同步参考信号相关，以找到基带信号的同步偏移。 当与基带信号同步时，基带处理可以与一组符号参考信号相关，以对基带信号中的顺序符号进行解码。

公开(公告)号：US20050036573A1

公开(公告)日：2005-02-17

申请号：US10641438

申请日：2003-08-15

申请人： Liang Zhang ,  Liang Li ,  Zhen Zhen Chen ,  Chenyang Yang

发明人： Liang Zhang ,  Liang Li ,  Zhen Zhen Chen ,  Chenyang Yang

IPC分类号： H04B1/707 ,  H04K1/00

CPC分类号： H04B1/707

摘要： A baseband process is provided for operating on a receiver in a communication system, such as an 802.15.4 communication system in the 868/915 MHz band In one aspect, the baseband process is useful for decoding a baseband signal, and in another aspect is useful for determining a clear channel assessment. In decoding the baseband signal, the process digitizes the baseband signal into sample sets according to a symbol period. The sample sets may be, for example, from sequential symbols having a known symbol value, such as from the preamble portion of a data frame. Since the symbol values are already known, the process may determine a reference value by correlating two or more known sample sets. To decode a sample set having an unknown code symbol, the process determines a correlation value by correlating that unknown sample set to a sample set having a known code symbol, which is typically the adjacent and preceding sample set. If the correlation value is the same as the reference value, then the unknown sample has the same code symbol as the known code symbol. The process advances to the next symbol period and sample set to sequentially decode symbols in the data frame.

摘要翻译： 提供了基带处理，用于在诸如868/915MHz频带中的802.15.4通信系统的通信系统中的接收机上操作。一方面，基带处理对于解码基带信号是有用的，另一方面是 有助于确定明确的渠道评估。 在对基带信号进行解码时，该处理根据符号周期将基带信号数字化为采样集。 样本集可以是例如来自具有已知符号值的顺序符号，例如来自数据帧的前导码部分。 由于符号值是已知的，所以该过程可以通过将两个或多个已知样本集合相关联来确定参考值。 为了解码具有未知代码符号的样本集合，该过程通过将该未知样本集合与具有通常为相邻和先前样本集合的已知代码符号的样本集相关联来确定相关值。 如果相关值与参考值相同，则未知样本具有与已知代码符号相同的代码符号。 该过程进行到下一个符号周期并且采样集合以顺序解码数据帧中的符号。