Method and apparatus for compensation for a DC voltage offset of a
digital to analog converter
    1.
    发明授权
    Method and apparatus for compensation for a DC voltage offset of a digital to analog converter 失效
    用于补偿数模转换器的直流电压偏移的方法和装置

    公开(公告)号:US5731772A

    公开(公告)日:1998-03-24

    申请号:US790399

    申请日:1997-01-29

    摘要: Disclosed is a method and a device for compensating the DC offset (dU) of a D/A converter (2), particularly in the base frequency modulator of a mobile phone. The method and the device use an error correction register (5), whose value is changed on the basis of the DC offset, and which is added to each signal sample to be converted for compensating the DC offset. The value of the error correction register (5) is changed in a testing mode so that a preset control value is fed into the D/A converter (2), corresponding to the zero voltage of the output of an ideal D/A converter; the voltage values of outputs of a differential output pair (2a, 2b) arranged in connection with the D/A converter (2) are compared to verify the polarity of the voltage difference (dU) of the outputs and the polarity, i.e. the sign, of a relative DC offset; and, on the basis of the polarity of the voltage difference (dU), the value of the error correction register (5) is either decreased or increased by one from the preset initial value which is preferably zero.

    摘要翻译: 公开了一种用于补偿D / A转换器(2)的DC偏移(dU)的方法和装置,特别是在移动电话的基频调制器中。 该方法和装置使用纠错寄存器(5),其值根据DC偏移改变,并且被添加到要转换的每个信号样本以补偿DC偏移。 误差校正寄存器(5)的值在测试模式下改变,使得预设的控制值被馈送到D / A转换器(2)中,对应于理想D / A转换器的输出的零电压; 将与D / A转换器(2)连接配置的差分输出对(2a,2b)的输出的电压值进行比较,以验证输出的电压差(dU)和极性的极性,即符号 ,相对DC偏移; 并且基于电压差(dU)的极性,误差校正寄存器(5)的值从预设的初始值(其优选为零)减小或增加1。

    Method and system for testing the functioning of data communication in a radio apparatus
    2.
    发明授权
    Method and system for testing the functioning of data communication in a radio apparatus 失效
    用于测试无线电设备中数据通信功能的方法和系统

    公开(公告)号:US06687499B1

    公开(公告)日:2004-02-03

    申请号:US09537519

    申请日:2000-03-29

    IPC分类号: H04Q720

    CPC分类号: H04W24/00

    摘要: To test the functioning of downlink data communication a mobile station comprises means (301, 302, 303, 304, 326) for receiving a signal in the downlink direction and means (331, 310, 311, 312, 313) for sending a signal uplink. It receives a test signal in the downlink direction (301, 302, 602) and compares the received test signal to a known form of the test signal (208, 603). In addition, the mobile station stores information produced by the comparison about errors detected in the received test signal (209) and sends uplink a signal representing the information stored (312, 313, 604).

    摘要翻译: 为了测试下行链路数据通信的功能,移动台包括用于在下行链路方向上接收信号的装置(301,302,303,304,326)和用于发送信号上行链路的装置(331,310,311,312,313) 。 它在下行链路方向(301,302,602)接收测试信号,并将接收的测试信号与已知形式的测试信号(208,603)进行比较。 此外,移动站存储通过比较而产生的关于在接收的测试信号(209)中检测到的错误的信息,并且向上行链路发送表示所存储的信息的信号(312,313,604)。

    Method and apparatus for measuring and optimising the quality of data transmission
    3.
    发明授权
    Method and apparatus for measuring and optimising the quality of data transmission 失效
    用于测量和优化数据传输质量的方法和装置

    公开(公告)号:US06856802B1

    公开(公告)日:2005-02-15

    申请号:US09538082

    申请日:2000-03-29

    CPC分类号: H04W24/00

    摘要: The invention concerns a method and associated hardware units for testing the functioning of downlink data communication in a mobile station (202, 802, 902). The mobile station is equipped for receiving (302, 805) a signal in the downlink direction and for sending (312, 808) a signal in the uplink direction. As a part of the method, a test signal (711, 715, 716, 805) is received in the downlink direction. The received test signal is compared (208, 713, 908) to a known form of the test signal. There is produced and temporarily stored (209, 806, 909) information about errors which were detected in the received test signal during the comparing step. In the uplink direction a signal is sent (714, 717, 808) representing the stored information about errors.

    摘要翻译: 本发明涉及用于测试移动台(202,802,902)中的下行链路数据通信的功能的方法和相关联的硬件单元。 该移动台装备用于在下行链路方向上接收(302,805)信号,并发送(312,808)上行方向的信号。 作为该方法的一部分,在下行链路方向上接收测试信号(711,715,716,805)。 所接收的测试信号被比较(208,713,908)到已知形式的测试信号。 产生并临时存储关于在比较步骤期间在接收到的测试信号中检测到的错误的信息(209,806,909)。 在上行链路方向,发送表示存储的关于错误的信息的信号(714,717,808)。

    Method and system for testing the functioning of a testing algorithm in a data transmission apparatus
    4.
    发明授权
    Method and system for testing the functioning of a testing algorithm in a data transmission apparatus 失效
    用于测试数据传输设备中的测试算法的功能的方法和系统

    公开(公告)号:US06914944B1

    公开(公告)日:2005-07-05

    申请号:US09565759

    申请日:2000-05-05

    CPC分类号: H04W24/00

    摘要: The invention pertains in general to the testing of the operation of radio and other data transmission apparatus. In particular the invention pertains to the testing of the operation of a digital radio apparatus on the basis of error statistics. In order to test functions relating to data transmission, a simulation system produces a pseudorandom bit sequence or some other test sequence which is packed into downlink frames and sent to the data transmission apparatus tested. In accordance with the invention, a known number of errors are generated in the test sequence. As the data transmission apparatus tested compares the received test sequence to the sequence it has produced, it detects the errors in the received sequence and compiles various error statistics, e.g., in the form of bit error ratio (BER) or frame erasure ratio (FER). An uplink connection is used to send these statistical data to the simulation system which examines whether the information produced by the data transmission apparatus tested matches the simulation system's information about the erroneousness of the sequence sent downlink.

    摘要翻译: 本发明一般涉及无线电和其他数据传输装置的操作测试。 具体地,本发明涉及基于错误统计测试数字无线电设备的操作。 为了测试与数据传输有关的功能,仿真系统产生一个伪随机比特序列或一些其他测试序列,该序列被打包到下行链路帧中并发送到测试的数据传输设备。 根据本发明,在测试序列中产生已知数量的错误。 当测试的数据传输设备将接收到的测试序列与其产生的序列进行比较时,它检测接收到的序列中的错误并编译各种错误统计信息,例如,以误码率(BER)或帧擦除率(FER)的形式 )。 使用上行连接将这些统计数据发送到模拟系统,该仿真系统检查由测试的数据传输装置产生的信息是否与模拟系统关于发送下行链路的序列的错误的信息相匹配。