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    • 2. 发明授权
    • Method and apparatus for space division multiple access receiver
    • US10778373B2
    • 2020-09-15
    • US14321297
    • 2014-07-01
    • Carl M Elam
    • Carl M Elam
    • H04L27/30H04L1/06H04B7/08
    • Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals. Such methods and systems then combine the plurality of phase modulated signals into a combined signal, generate expected signals, and cross-correlate the combined signal with the expected signals to form correlation signals. Such methods and systems then store the correlation signals in a correlation signal memory and analyze the correlation signals to extract information from the transmitted signals.
    • 3. 发明申请
    • METHOD AND APPARATUS FOR SPACE DIVISION MULTIPLE ACCESS RECEIVER
    • 空间多路访问接收机的方法与装置
    • US20090323869A1
    • 2009-12-31
    • US12391364
    • 2009-02-24
    • Carl M. Elam
    • Carl M. Elam
    • H04L27/06H04L27/00
    • H04L1/0631H04B7/0854
    • Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals. Such methods and systems then combine the plurality of phase modulated signals into a combined signal, generate expected signals, and cross-correlate the combined signal with the expected signals to form correlation signals. Such methods and systems then store the correlation signals in a correlation signal memory and analyze the correlation signals to extract information from the transmitted signals.
    • 与本发明一致的方法和系统在具有多个接收元件的接收机中接收多个发射信号,其中每个发射信号具有不同的空间位置。 这样的方法和系统在多个接收元件处接收多个发射信号,以形成多个接收元件信号,形成从多个接收元件信号导出的组合信号,并从组合中检测多个发射信号中的每一个 信号由其不同的空间位置。 为了实现这一点,与本发明一致的方法和系统产生多个任意相位调制信号,并且用相位调制信号中的不同一个相位调制多个接收元件信号中的每一个以形成多个相位调制信号。 这样的方法和系统然后将多个相位调制信号组合成组合信号,产生预期信号,并将组合信号与预期信号互相关,以形成相关信号。 这样的方法和系统然后将相关信号存储在相关信号存储器中,并分析相关信号以从发射信号中提取信息。
    • 4. 发明授权
    • Method and apparatus for space division multiple access receiver
    • 空分多址接收机的方法和装置
    • US07251286B2
    • 2007-07-31
    • US10983899
    • 2004-11-09
    • Carl M. Elam
    • Carl M. Elam
    • H04L1/02
    • H04L1/0631H04B7/0854
    • Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals. Such methods and systems then combine the plurality of phase modulated signals into a combined signal, generate expected signals, and cross- correlate the combined signal with the expected signals to form correlation signals. Such methods and systems then store the correlation signals in a correlation signal memory and analyze the correlation signals to extract information from the transmitted signals.
    • 与本发明一致的方法和系统在具有多个接收元件的接收机中接收多个发射信号,其中每个发射信号具有不同的空间位置。 这样的方法和系统在多个接收元件处接收多个发射信号,以形成多个接收元件信号,形成从多个接收元件信号导出的组合信号,并从组合中检测多个发射信号中的每一个 信号由其不同的空间位置。 为了实现这一点,与本发明一致的方法和系统产生多个任意相位调制信号,并且用相位调制信号中的不同一个相位调制多个接收元件信号中的每一个以形成多个相位调制信号。 这样的方法和系统然后将多个相位调制信号组合成组合信号,产生预期信号,并将组合信号与预期信号进行交叉相关以形成相关信号。 这样的方法和系统然后将相关信号存储在相关信号存储器中,并分析相关信号以从发送的信号中提取信息。
    • 8. 发明申请
    • METHOD AND APPARATUS FOR SPACE DIVISION MULTIPLE ACCESS RECEIVER
    • US20150163017A1
    • 2015-06-11
    • US14321297
    • 2014-07-01
    • Carl M. Elam
    • Carl M. Elam
    • H04L1/06H04B7/08
    • Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals. Such methods and systems then combine the plurality of phase modulated signals into a combined signal, generate expected signals, and cross-correlate the combined signal with the expected signals to form correlation signals. Such methods and systems then store the correlation signals in a correlation signal memory and analyze the correlation signals to extract information from the transmitted signals.
    • 9. 发明授权
    • Secure communication using array transmitter
    • 使用阵列发射机进行安全通信
    • US06275679B1
    • 2001-08-14
    • US06788617
    • 1985-06-24
    • Carl M. ElamDale A. Leavy
    • Carl M. ElamDale A. Leavy
    • H04B106
    • H04K3/827H01Q3/22H01Q3/36H04B7/0617H04K1/006H04K2203/32
    • The radio transmission circuit comprises 16 antenna elements in a broadside array. A carrier wave is routed to the 16 elements and the phase to each element is adjusted to direct the transmitted wavefront toward a selected receive point. Prior to transmission, however, the carrier to each element is independently modulated by a two-state (0/&pgr;) phase shifter. Each of the 16 carriers is modulated with the first 16 orthogonal Walsh waveforms (a digital counterpart of the Fourier Transform). The output power levels at all antennas are equal, only the phase of the RF carriers change. Depending upon the sign conditions (inverted or noninverted) for the various 16 modulation waveforms, a pulse position modulation (PPM) signal is transmitted in which the pulse can occupy one of 16 time positions. This PPM signal will be received clearly at the intended location, however, at other locations, approximately a degree or more to the side of the transmitted direction, the signal will become garbled due to the improper phase relation of the 16 signals arriving at those locations. This circuit is unique in that signals transmitted by broad side array elements are modulated using two-state (0/&pgr;) phase shifters controlled by orthogonal Walsh elements. The Walsh elements are selectively inverted or noninverted in such a manner as to generate a PPM data signal along the intended direction of reception, and produce garbled data to receivers off the signal beam.
    • 无线电传输电路包括宽边阵列中的16个天线元件。 载波被路由到16个元件,并且调整到每个元件的相位以将发射的波前指向所选择的接收点。 然而,在发送之前,到每个元件的载波被两状态(0 / pi)移相器独立地调制。 16个载波中的每一个用前16个正交沃尔什波形(傅里叶变换的数字对应)进行调制。 所有天线的输出功率电平相等,只有RF载波的相位发生变化。 根据各种16个调制波形的符号条件(反相或非反相),发送脉冲位置调制(PPM)信号,脉冲可以占据16个时间位置之一。 该PPM信号将在预期的位置被清楚地接收,然而,在其它位置,大约在传输方向一侧或更多的位置,由于到达那些位置的16个信号的不正确的相位关系,信号将变得乱码 该电路是唯一的,因为由宽边阵列元件发送的信号是通过正交沃尔什元件控制的双态(0 /π)移相器进行调制的。 Walsh元件以沿着预期的接收方向生成PPM数据信号的方式选择性地反相或非反相,并且将信号波束上的接收器产生乱码数据。
    • 10. 发明授权
    • Receiver apparatus and method for providing conditional access to received televison programs
    • 用于向接收的电视节目提供有条件访问的接收机装置和方法
    • US06216263B1
    • 2001-04-10
    • US09066215
    • 1998-04-24
    • Carl M. Elam
    • Carl M. Elam
    • H04N716
    • H04N7/163H04N21/4532H04N21/454
    • A television receiver is shown and described for receiving and displaying to a viewer a program content rated television program transmission which includes a data signal. Within the receiver the program content rating, which preferably conforms to the U.S. standard age-based rating and content categories, is derived from the data signal. A viewing control circuit, in response to user inputs, stores one or more program rating viewing authorizations. The derived program rating is compared with the stored viewing authorization for the viewer to develop a blanking control signal. A signal integrity monitoring circuit monitors the signal to provide a rating default control signal in the absence of a reliable program rating signal after a predetermined delay. A blanking circuit, responsive to the blanking control signal and the rating default signal, blanks the program video and mutes the program audio in the event the program level is not authorized to the viewer or the program content rating is not reliable. The rating default control signal may, in one operating mode of the receiver, be applied directly to the blanking circuit to blank the program, or, in another operating mode of the receiver, may, depending on the stored viewing authorization, inhibit the blanking of the program by the first control signal and the rating default signal to allow viewing of the program. In a preferred embodiment, the monitoring circuit monitors the parity error rate in the digital data signal component and provides the control signal when the parity error rate exceeds a predetermined threshold level.
    • 示出并描述了一种电视接收机,用于向观看者显示包括数据信号的节目内容评级电视节目传输。 在接收机内,优选地符合美国标准的基于年龄的评级和内容类别的节目内容分级是从数据信号导出的。 观看控制电路响应于用户输入,存储一个或多个节目评级查看授权。 将导出的程序评级与存储的观看授权进行比较,以便观看者开发消隐控制信号。 信号完整性监控电路在预定的延迟之后,在不存在可靠的节目评级信号的情况下监视信号以提供评级默认控制信号。 消隐电路响应于消隐控制信号和额定默认信号,在节目级别未被授权给观众或节目内容分级不可靠的情况下,将节目视频空白并使节目音频静音。 额定默认控制信号可以在接收机的一种操作模式中直接应用于消隐电路以使程序空白,或者在接收机的另一操作模式中,根据存储的观看授权,可以抑制消隐 程序由第一控制信号和额定默认信号允许查看程序。 在优选实施例中,监视电路监视数字数据信号分量中的奇偶校验错误率,并在奇偶校验错误率超过预定阈值电平时提供控制信号。