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    Receiver including frequency down-converter and analog-to-digital converter for a wireless telecommunication system
    35.
    发明授权
    Receiver including frequency down-converter and analog-to-digital converter for a wireless telecommunication system 有权
    接收机包括用于无线电信系统的降频转换器和模数转换器

    公开(公告)号：US06804308B1

    公开(公告)日：2004-10-12

    申请号：US09605465

    申请日：2000-06-28

    Applicant: Shimen K. Claxton ,  Bert K. Oyama ,  Mark Kintis ,  Andrew D. Smith ,  Craig R. Talbott ,  Donald R. Martin ,  William M. Skones ,  Vincent C. Moretti

    Inventor： Shimen K. Claxton ,  Bert K. Oyama ,  Mark Kintis ,  Andrew D. Smith ,  Craig R. Talbott ,  Donald R. Martin ,  William M. Skones ,  Vincent C. Moretti

    IPC: H03K900

    CPC classification number: H04B1/0007 ,  H04B1/0003 ,  H04B1/28

    Abstract: A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received signals can be simultaneously processed. The receiver (10) includes a specialized LNA (16), frequency down-converter (18) and ADC (20) to perform the wideband signal processing while maintaining receiver performance. The frequency down-converter (18) employs a suitable mixer (28), BPA (32), attenuator (34), and transformer (36) that are tuned to provide the desired frequency down-conversion and amplitude control over the desired wideband. The down-converter devices are selected depending on the particular performance criteria of the ADC (20). A specialized digital channelizer (22) is included in the receiver (10) that receives the digital signal from the ADC (20), and separates the signals into the multiple channels. In one embodiment, the frequency down-conversion is performed in a single down-conversion process, and the ADC (20) employs delta-sigma processing to provide digital conversion over the complete frequency band. In an alternate embodiment, the frequency down-conversion is performed in a double down-conversion process so that a less complex ADC (62) can be used.

    Abstract translation: 一种用于无线电信系统的接收机（10），其提供接收信号的相对宽带信号处理，而不增加信号失真，使得可以同时处理多个接收信号。 接收器（10）包括专用LNA（16），降频转换器（18）和ADC（20），以在维持接收机性能的同时执行宽带信号处理。 降频转换器（18）采用合适的混频器（28），BPA（32），衰减器（34）和变压器（36），其被调谐以在期望的宽带上提供期望的频率下变频和幅度控制。 根据ADC的特定性能标准（20）选择下转换器器件。 在接收器（10）中包括一个专门的数字信道化器（22），其接收来自ADC（20）的数字信号，并将信号分离成多个信道。 在一个实施例中，在单个下变频处理中执行降频转换，并且ADC（20）采用delta-sigma处理来在整个频带上提供数字转换。 在替代实施例中，在双下变频过程中执行降频转换，使得可以使用较不复杂的ADC（62）。

    Multi-channel peak power smoothing
    36.
    发明授权
    Multi-channel peak power smoothing 有权
    多通道峰值功率平滑

    公开(公告)号：US06771940B2

    公开(公告)日：2004-08-03

    申请号：US09818881

    申请日：2001-03-27

    Applicant: Andrew D. Smith

    Inventor： Andrew D. Smith

    IPC: H04J1302

    CPC classification number: H04L27/2618

    Abstract: A multi-channel transmission system and method provide peak power smoothing without additional in-band interference. The system includes a multi-carrier waveform generator for reducing peak amplifier power required to transmit a digital multi-carrier waveform based on a plurality of digital carrier waveforms. A signal conversion system generates an analog multi-carrier waveform based on the digital multi-carrier waveform. The analog multi-carrier waveform has a center frequency and a desired gain over the original signal. A bandpass filter is coupled to the signal conversion system for restriction of the analog multi-carrier output waveform to a desired transmission bandwidth. The multi-carrier waveform generator has a nulling waveform generator coupled to a plurality of single carrier waveform modules for generating a digital nulling waveform based on the retrieved data. The nulling waveform reduces a peak power of the multi-carrier waveform and results in a reduced signal envelope.

    Abstract translation: 多通道传输系统和方法提供峰值功率平滑而无需额外的带内干扰。 该系统包括一个多载波波形发生器，用于减少基于多个数字载波波形传输数字多载波波形所需的峰值放大器功率。 信号转换系统基于数字多载波波形生成模拟多载波波形。 模拟多载波波形在原始信号上具有中心频率和期望的增益。 带通滤波器耦合到信号转换系统，用于将模拟多载波输出波形限制到期望的传输带宽。 多载波波形发生器具有耦合到多个单载波波形模块的归零波形发生器，用于基于检索的数据产生数字归零波形。 归零波形降低了多载波波形的峰值功率并导致信号包络的减小。

    Spacecraft with all-cryogenic electronics
    39.
    发明授权
    Spacecraft with all-cryogenic electronics 失效
    具有全低温电子学的航天器

    公开(公告)号：US6027077A

    公开(公告)日：2000-02-22

    申请号：US123135

    申请日：1998-07-27

    Applicant: Howard S. Eller ,  Ramon Coronel ,  John W. Spargo ,  Larry R. Eaton ,  Andrew D. Smith

    Inventor： Howard S. Eller ,  Ramon Coronel ,  John W. Spargo ,  Larry R. Eaton ,  Andrew D. Smith

    IPC: B64G1/22 ,  B64G1/50 ,  B64G1/10

    CPC classification number: B64G1/50 ,  B64G1/22

    Abstract: A spacecraft (10) having a cryogenic cooler (24) that maintains different temperatures in thermally insulated and nested enclosures (26, 28, 12). In the coldest enclosure (26), which is maintained, for example, approximately 10.degree. K, low-temperature superconducting (LTS) processors (32, 34) perform bus and payload processing functions at very high speed. The next-coldest enclosure (28) is maintained at approximately 77.degree. K and houses high-temperature superconducting (HTS) electronic modules, such as for power regulation and distribution (40) and a payload sensor processing module (38). The third of the enclosures (12) is maintained at approximately 300.degree. K and houses other modules operating at room temperature, including a transponder (44), power control (46), energy storage (48), a propulsion subsystem (22), a downlink data processing module (49) and the cryogenic cooler (24) itself. Thermal functions of the spacecraft are effectively centralized in the cryogenic cooler (24) and the bus and payload functions of the spacecraft are provided very efficiently in a small, compact an potentially low-cost configuration.

    Abstract translation: 具有在绝热和嵌套外壳（26,28,12）中保持不同温度的低温冷却器（24）的航天器（10）。 在例如约10K的低温超导（LTS）处理器（32,34）中保持的最冷的外壳（26）以非常高的速度执行总线和有效载荷处理功能。 下一个最冷的外壳（28）保持在大约77°K，并容纳高温超导（HTS）电子模块，例如功率调节和分配（40）和有效载荷传感器处理模块（38）。 外壳（12）中的第三个保持在大约300°K，并且容纳在室温下工作的其他模块，包括应答器（44），功率控制（46），能量存储（48），推进子系统（22） 下行链路数据处理模块（49）和低温冷却器（24）本身。 太空船的热功能有效地集中在低温冷却器（24）中，并且以小型，紧凑的潜在低成本配置非常有效地提供了航天器的总线和有效负载功能。

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