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    • 3. 发明授权
    • Method and apparatus for load shedding in a TDMA packet data system
    • TDMA分组数据系统中负载脱落的方法和装置
    • US6111867A
    • 2000-08-29
    • US989821
    • 1997-12-12
    • Karl D. MannShamim Akbar RahmanKamel M. Shaheen
    • Karl D. MannShamim Akbar RahmanKamel M. Shaheen
    • H04W72/04H04B7/212H04Q7/20
    • H04W72/02H04W48/16H04W72/0486
    • A system implements a method of allocating a mobile communications device, such as a mobile end station, to packet channels, such as packet control channels within a cell. A mobile communications device identifies for access a packet channel by executing an algorithm, such as a hashing algorithm. The mobile communications device then reads a loading message broadcast for that packet channel. If the loading message indicates to the mobile communications device that another packet channel or PCCH should be sought, the mobile communications device tunes to a beacon frequency and reads information for each packet channel or PCCH broadcast at the beacon frequency. The mobile then tunes to a suitable channel. The processing to select a suitable channel is accomplished in the mobile communications device, thereby relieving other system elements, such as the mobile data base station (MDBS) from carrying out that processing and reducing the information traffic on overloaded channels.
    • 系统实现将诸如移动终端站的移动通信设备分配给诸如小区内的分组控制信道的分组信道的方法。 移动通信设备通过执行诸如散列算法的算法来标识用于访问分组信道。 然后,移动通信设备读取用于该分组信道的加载消息广播。 如果加载消息向移动通信设备指示应该寻求另一分组信道或PCCH,则移动通信设备调谐到信标频率,并且以信标频率读取每个分组信道或PCCH广播的信息。 移动台然后调谐到合适的频道。 在移动通信设备中完成选择合适的信道的处理,从而减轻诸如移动数据基站(MDBS)的其他系统元件的执行,并减少重载信道上的信息流量。
    • 5. 发明授权
    • System and method for Viterbi decoding on encrypted data
    • 用于加密数据维特比解码的系统和方法
    • US06760438B1
    • 2004-07-06
    • US09345419
    • 1999-07-01
    • Yan HuiKarl D. Mann
    • Yan HuiKarl D. Mann
    • H04L900
    • H04L1/006H04L1/0041H04L1/0054H04L1/0065H04L1/0071H04L9/065H04L2001/0098H04L2209/046H04L2209/34
    • A system and method for Viterbi decoding on encrypted data is disclosed. At the receiver, maximum likelihood decoding is performed based on received input in the encryption domain. When selecting a path from one stage of a Viterbi decoding trellis to the next, a local metric may be associated with each of the possible paths based on Euclidean distance between a received symbol and a path state. The path state is determined by encrypting the binary path state. An overall metric is associated with each state equivalent to a sum of local path metrics along a survivor path of selected paths. At the end of the Viterbi decoding trellis, a decoded and decrypted bit sequence is obtained by tracing back in a conventional manner.
    • 公开了一种用于对加密数据进行维特比解码的系统和方法。 在接收机处,基于加密域中的接收输入执行最大似然解码。 当从维特比解码网格的一个级到下一级的路径选择时,本地度量可以基于接收到的符号和路径状态之间的欧氏距离与每个可能的路径相关联。 通过加密二进制路径状态来确定路径状态。 总体度量与相当于所选路径的幸存路径的本地路径量度的总和的每个状态相关联。 在维特比解码网格结束时,通过以常规方式追溯来获得解码和解密的比特序列。
    • 8. 发明授权
    • Transmitted signal power control in cellular communications systems
    • 蜂窝通信系统中的传输信号功率控制
    • US06418137B1
    • 2002-07-09
    • US09210364
    • 1998-12-14
    • Chandra Sekhar BontuShavantha KularatnaN. Gamini SenarathKarl D. MannPeter Anthony Barany
    • Chandra Sekhar BontuShavantha KularatnaN. Gamini SenarathKarl D. MannPeter Anthony Barany
    • H04B7212
    • H04W52/367H04W52/24H04W52/362
    • A base station produces a power control bit dependent on SNR (signal-to-noise ratio) determined for each time slot of a signal received from a remote station of a cellular communications system. If the SNR exceeds an upper threshold by an upper threshold margin, the power control bit is a binary 0 and the upper threshold margin is increased; if the SNR is below a lower threshold by a lower threshold margin, the power control bit is a binary 1 and the lower threshold margin is increased; and otherwise the power control bit alternates its binary value for successive time slots and setting the threshold margins are reset. In the remote station, the power control bits are accumulated by a bidirectional counter and the transmitted signal power is only changed up or down in response to the count exceeding a respective threshold. The process can also or instead be used for the opposite transmission direction, and provides fast power control using a single bit per time slot in a manner that is tolerant of errors in the transmitted power control bits.
    • 基站产生取决于从蜂窝通信系统的远程站接收的信号的每个时隙确定的SNR(信噪比)的功率控制位。 如果SNR超过上限阈值上限阈值,则功率控制位为二进制0,上限阈值增加; 如果SNR低于阈值下限阈值,则功率控制位为二进制1,下限阈值增加; 否则功率控制位会对连续时隙交替其二进制值,并且设置阈值余量被重置。 在远程站中,功率控制位由双向计数器累积,并且响应于超过相应阈值的计数,发送的信号功率仅被上升或下降。 该过程也可以或替代地用于相反的传输方向,并且以容纳发射功率控制位中的错误的方式提供使用每个时隙的单个位的快速功率控制。
    • 9. 发明授权
    • System and method for decryption in the symbol domain
    • 用于在符号域中解密的系统和方法
    • US6035040A
    • 2000-03-07
    • US953763
    • 1997-10-17
    • Karl D. MannYan Hui
    • Karl D. MannYan Hui
    • H04K1/02H04L9/18H04L9/28
    • H04K1/02
    • A method of decrypting data comprising encrypting bit-wise data, using a first plural bit mask, modulating the data into symbol format, and transmitting the symbol format data to a receiving apparatus, in a receiving apparatus, rotating a current received symbol sample by an amount equal to one of (i) its difference in phase from an immediately preceding received symbol sample toward the phase of the immediately preceding received symbol sample phase, and (ii) by an amount equal to estimated carrier phase towards zero phase, generating a second bit mask subset derived from values of the first bit mask, comprising plural bits for each symbol, reflecting the rotated symbol by a phase defined by the plural bits to form a symbol which is devoid of encryption, and providing the symbol devoid of encryption to a soft-decision decoder.
    • 一种对数据进行解密的方法,包括:在接收装置中,使用第一多位掩码,将数据调制为符号格式,并将符号格式数据发送到接收装置,将当前接收到的符号样本转换为 数量等于(i)其相对于紧接在前的接收符号样本相对于紧接在前的接收符号采样相位的相位的差异中的一个,以及(ii)等于估计的载波相位朝向零相位的量,产生第二 从第一位掩码的值导出的位掩码子集,其包括每个符号的多个比特,通过由多个比特定义的相位反射旋转的符号,以形成没有加密的符号,并将缺少加密的符号提供给 软判决解码器。