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    • 52. 发明申请
    • Carrier offset estimator
    • 载波偏移估计器
    • US20070268978A1
    • 2007-11-22
    • US11888168
    • 2007-07-31
    • Leonid KazakevichFatih OzluturkAlexander Reznik
    • Leonid KazakevichFatih OzluturkAlexander Reznik
    • H04L5/12
    • H04L27/3836H04L27/2332H04L27/3854H04L2027/0065H04L2027/0085
    • A system for estimating carrier offset includes includes a transmitter configured to transmit a quadrature modulated signal, and a receiver. The receiver includes an input configured to receive the quadrature modulated signal, a local oscillator configured to generate cosine and sine waves at a carrier frequency of the quadrature modulated signal, at least one cosine mixer configured to generate a carrier frequency demodulated output, at least one sine mixer configured to generate a carrier frequency demodulated output, a plurality of lowpass filters configured to filter the demodulated output of the cosine and sine mixers to produce filtered cosine and sine signal components, and a carrier offset detection processor to estimate a carrier offset between the carrier frequency and a local oscillator frequency based on the filtered output of the lowpass filters.
    • 用于估计载波偏移的系统包括:发射机,被配置为发送正交调制信号;以及接收机。 所述接收机包括被配置为接收所述正交调制信号的输入端,被配置为在所述正交调制信号的载波频率上产生余弦和正弦波的本地振荡器,配置成产生载波频率解调输出的至少一个余弦混频器,至少一个 配置为产生载波频率解调输出的多个低通滤波器,多个低通滤波器,被配置为对余弦和正弦混频器的解调输出进行滤波,以产生滤波余弦和正弦信号分量;以及载波偏移检测处理器,用于估计载波偏移 基于低通滤波器的滤波输出的载波频率和本地振荡器频率。
    • 53. 发明申请
    • Method and system for all digital gain control
    • 所有数字增益控制的方法和系统
    • US20070206684A1
    • 2007-09-06
    • US11800114
    • 2007-05-03
    • Leonid KazakevichRui Yang
    • Leonid KazakevichRui Yang
    • H04B14/04
    • H03G7/06H03G3/001H03M1/1235
    • An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of effective ADC bits by compressing the baseband input analog signal using a logarithmic circuit. After the compressed analog signal is converted into a digital signal, a digital anti-log process or look-up table (LUT) is used to expand the digital signal back to the original linear scale. The word size of the output of the anti-log process is larger than the input word size due to the nature of the anti-log function. To reduce the word size of the digital signal an open loop normalization technique can be applied.
    • 模拟/数字增益控制装置避免了与闭环AGC电路的性质相关的一些要求,并且满足剩余要求,而没有太多困难使用模数转换方法,通过压缩有效ADC位数来增加有效ADC位的数量 基带输入模拟信号使用对数电路。 在将压缩的模拟信号转换为数字信号之后,使用数字反对数处理或查找表(LUT)将数字信号扩展回原始的线性刻度。 由于反日志功能的性质,反日志进程输出的字大小大于输入字大小。 为了减小数字信号的字大小,可以应用开环归一化技术。
    • 54. 发明授权
    • Wireless communication method and system with controlled WTRU peer-to-peer communications
    • 无线通信方法和具有受控WTRU对等通信的系统
    • US07239874B2
    • 2007-07-03
    • US11366114
    • 2006-03-02
    • Gautam G. ReddyPrabhakar R. ChitrapuLeonid KazakevichTeresa Joanne HunkelerArty Chandra
    • Gautam G. ReddyPrabhakar R. ChitrapuLeonid KazakevichTeresa Joanne HunkelerArty Chandra
    • H04Q7/20
    • H04W88/04G01S5/0027H04W4/02H04W64/00H04W84/00H04W88/06
    • A wireless network provides controlled wireless communications with multi-mode wireless WTRUs. The wireless network has at least one base station having a transceiver operating in an infrastructure communication mode with multi mode WTRUs and a controller that transmits control signals via infrastructure communications with a WTRU that control peer-to-peer mode communications of that WTRU with other WTRUs. A WTRU has transceiver components configured for selective operation in an infrastructure communication mode with a network base station and in a peer-to-peer communication mode with other WTRUs. The WTRU also has a transceiver controller configured to selectively control peer-to-peer mode communications with other WTRUs based on communication signals received in infrastructure communications with a network base station. Preferably, the transceiver controller is configured to control the transceiver components to switch between infrastructure communication mode and peer-to-peer communication mode based on Quality of Service criteria.
    • 无线网络提供与多模式无线WTRU的受控无线通信。 无线网络具有至少一个基站,其具有在具有多模式WTRU的基础设施通信模式中工作的收发器,以及控制器,其经由与WTRU的基础设施通信来发送控制信号,该WTRU控制该WTRU与其他WTRU的对等模式通信 。 WTRU具有被配置为在与基站通信模式中的选择性操作并且与其他WTRU的对等通信模式中的选择性操作的收发器组件。 WTRU还具有收发器控制器,其被配置为基于在与基站通信的基础设施通信中接收的通信信号来选择性地控制与其他WTRU的对等模式通信。 优选地,收发器控制器被配置为基于服务质量标准来控制收发器组件在基础设施通信模式和对等通信模式之间切换。
    • 55. 发明申请
    • Multi-mode radio with interference cancellation circuit
    • 具有干扰消除电路的多模无线电
    • US20070117522A1
    • 2007-05-24
    • US11654766
    • 2007-01-17
    • Timothy AxnessLeonid Kazakevich
    • Timothy AxnessLeonid Kazakevich
    • H04B1/44
    • H04B1/0057H04B1/525
    • A multi-mode wireless transmit/receive unit (WTRU) includes at least one antenna, first and second communication mode receivers and a first communication mode transmitter. The first and second receivers simultaneously receive signals from the antenna. The first transmitter generates and sends a first type of signal to the antenna while, at the same time, the second receiver receives a second type of signal from the antenna. In a preferred embodiment, the WTRU further includes a vector multiplier configured to reduce or eliminate interference of signals received by the second receiver, the interference being caused by the first transmitter. The vector multiplier adjusts the phase and amplitude of noise (i.e., spurious in-band noise) measured by the second receiver. The WTRU may further include a second communication mode transmitter configured to generate and send a second type of signal to the antenna.
    • 多模式无线发射/接收单元(WTRU)包括至少一个天线,第一和第二通信模式接收机和第一通信模式发射机。 第一和第二接收机同时从天线接收信号。 第一发射机产生并向天线发送第一类型的信号,同时第二接收机从天线接收第二类型的信号。 在优选实施例中,WTRU还包括被配置为减少或消除由第二接收机接收的信号的干扰的矢量乘法器,该干扰由第一发射机引起。 矢量乘法器调节由第二接收机测量的噪声的相位和幅度(即,杂带带内噪声)。 WTRU可以进一步包括第二通信模式发射机,其被配置为产生并向天线发送第二类型的信号。