公开(公告)号：US07706475B1

公开(公告)日：2010-04-27

申请号：US11251431

申请日：2005-10-14

Applicant: Rahul Kopikare ,  Yungping Hsu ,  Bhaskar Nallapureddy

Inventor： Rahul Kopikare ,  Yungping Hsu ,  Bhaskar Nallapureddy

IPC: H04L27/00

CPC classification number: H04L27/364 ,  H04L27/38

Abstract: A communications system is provided that includes a detector that has I/Q mismatch, a calibration circuit that estimating a phase and/or an amplitude mismatch of the detector, and a compensation circuit that uses the estimated phase and/or amplitude mismatch to mitigate the effects of the amplitude and/or phase mismatch. An IQ-modulated signal produced by the I/Q-modulator can be communicated over a loop back connection to the detector of the communication system. The calibration circuit can estimate the I/Q mismatch for the IQ-modulator and can provide the estimated values to a pre-compensation circuit. In one aspect, I/Q mismatch in the IQ-modulator of a communication system can be determined using a spectrum analyzer. Power measurements can be used to compute the amplitude mismatch and the phase mismatch of an IQ-modulator.

Abstract translation: 提供一种通信系统，其包括具有I / Q不匹配的检测器，用于估计检测器的相位和/或幅度失配的校准电路，以及使用估计的相位和/或幅度失配来减轻 幅度和/或相位不匹配的影响。 由I / Q调制器产生的IQ调制信号可以通过回路连接传送到通信系统的检测器。 校准电路可以估计IQ调制器的I / Q失配，并可以将估计值提供给预补偿电路。 在一个方面，可以使用频谱分析仪来确定通信系统的IQ调制器中的I / Q失配。 功率测量可用于计算IQ调制器的幅度失配和相位失配。

公开(公告)号：US07697688B1

公开(公告)日：2010-04-13

申请号：US10974388

申请日：2004-10-27

Applicant: Peter Loc ,  Rahul Kopikare

Inventor： Peter Loc ,  Rahul Kopikare

IPC: H04L9/28 ,  H04L9/32 ,  H04L9/00 ,  H04K1/00

CPC classification number: H04L63/068 ,  H04L63/0428 ,  H04L63/0457 ,  H04L63/123 ,  H04W12/04 ,  H04W12/10 ,  H04W80/02 ,  H04W84/12

Abstract: An apparatus includes a key mixing circuit, an input circuit, and a decapsulation circuit. The key mixing circuit generates N Wired Equivalent Privacy (WEP) seeds, N≧1, each based on a predetermined temporal key, a transmitter MAC address, and a predetermined start value for a Temporal Key Integrity Protocol (TKIP) Sequence Count (TSC). The input circuit receives a message including the transmitter MAC address and the predetermined start value. The key mixing circuit generates the N WEP seeds based on the message. The input circuit receives N encapsulated MAC Payload Data Units (MPDUs) each including the transmitter MAC address and one of N values for the TSC, greater than or equal to the predetermined start value. The decapsulation circuit decapsulates the N encapsulated MPDUs using one of the N WEP seeds generated based on the value for the TSC in the respective one of the N encapsulated MPDUs.

Abstract translation: 一种装置包括密钥混合电路，输入电路和解封装电路。 密钥混合电路基于预定的时间密钥，发送机MAC地址和用于时间密钥完整性协议（TKIP）序列计数（TSC））的预定起始值，生成N≥1的N个有线等效保密（WEP）种子， 。 输入电路接收包含发送器MAC地址和预定起始值的消息。 密钥混合电路基于消息生成N个WEP种子。 输入电路接收N个封装的MAC有效载荷数据单元（MPDU），每个包含发送器MAC地址和TSC的N个值之一，大于或等于预定的起始值。 解封装电路使用N个封装的MPDU中的相应一个中基于TSC的值产生的N个WEP种子之一对N个封装的MPDU进行解封装。