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    Carrier transversal equalizer
    2.
    发明授权
    Carrier transversal equalizer 失效
    承运人横向平等机

    公开(公告)号：US3611201A

    公开(公告)日：1971-10-05

    申请号：US3611201D

    申请日：1969-10-21

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： GOELL JAMES E

    IPC: H01P1/18 ,  H04L27/01 ,  H03H7/10 ,  H03H7/30 ,  H04B3/04

    CPC classification number: H01P1/18 ,  H04L25/03885 ,  H04L27/01

    Abstract: A carrier transversal equalizer includes a plurality of parallel modules each comprising the series combination of an attenuator and a time-delay element. The need for phase shifters is obviated provided that the equalizer is designed such that its complex gain function is periodic, its phase characteristic is odd about the origin and its gain characteristic is even about the origin.

    Non-coherent differential phase detection
    3.
    发明授权
    Non-coherent differential phase detection 失效
    非相干差分相位检测

    公开(公告)号：US3660764A

    公开(公告)日：1972-05-02

    申请号：US3660764D

    申请日：1969-11-26

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： GOELL JAMES E

    IPC: H04L27/18 ,  H04L27/233 ,  H04B1/16 ,  H04L27/22

    CPC classification number: H04L27/2331

    Abstract: A differentially phase modulated (DPM) information signal, such as a binary differentially coherent phase shift-keyed signal, is detected without the need for a synchronous local oscillator by decomposing the carrier information signal into its baseband conjugate in-phase and out-of-phase components, I(t) and Q(t), respectively, generating from the components the functions F(t) Q(t)I(t-T)-I(t)Q(t-T) and G(t) I(t)I(t-T)+Q(t)Q(t-T) and subsequently forming H1(t) F(t)+G(t) tan Alpha 1, and H2(t) F(t)+G(t) tan Alpha 2, where T is the bit interval and Alpha 1 and Alpha 2 are arbitrary but generally unequal. In the binary case, however, Alpha 1 Alpha 2 0 and F(t) is the differentially phase detected signal. In higher order DPM systems the equations for H1(t) and H2(t) are simultaneously solved to recover the differential phase information.

    Abstract translation: 检测差分相位调制（DPM）信息信号，例如二进制差分相干相移键控信号，而不需要同步本地振荡器，通过将载波信息信号分解成其基带共轭同相和不相位， 分别由功能F（t）= Q（t）I（tT）-I（t）Q（tT）和G（t）= I（t）产生的相位分量I（t）和Q （t）I（tT）+ Q（t）Q（tT），随后形成H1（t）= F（t）+ G（t）tanα1，H2（t）= F（t） t）tanα2，其中T是比特间隔，α1和α2是任意的，但通常不相等。 然而，在二进制的情况下，α1 =α2 = 0，F（t）是差分相位检测信号。 在高阶DPM系统中，同时解决了H1（t）和H2（t）的等式，以恢复差分相位信息。

    Apparatus and method for the synchronous detection of a differentially phase modulated signal
    5.
    发明授权
    Apparatus and method for the synchronous detection of a differentially phase modulated signal 失效
    用于同步检测差分相位调制信号的装置和方法

    公开(公告)号：US3638125A

    公开(公告)日：1972-01-25

    申请号：US3638125D

    申请日：1969-11-26

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： GOELL JAMES E

    IPC: H04L27/00 ,  H04L27/18 ,  H04L27/227 ,  H04B1/30

    CPC classification number: H04L27/2273 ,  H04L2027/0067 ,  H04L2027/0075

    Abstract: In a synchronous detector the carrier of a binary differentially coherent phase shift-keyed signal is recovered by decomposing the carrier information signal into its conjugate in-phase and outof-phase components which contain in their arguments a term delta (t) representing the phase difference between the carrier and a local oscillator signal. The conjugate components are multiplied to generate a product signal which is sampled every other time slot to produce an error signal proportional to sin(2 delta (t)). This signal is applied to the local oscillator to phase lock the local oscillator signal to the carrier of the information signal.

    Abstract translation: 在同步检测器中，通过将载波信息信号分解成其共轭同相和异相分量来恢复二进制差分相干相移键控信号的载波，其中包含在它们的参数中的术语delta（t） 载波和本地振荡器信号之间的相位差。 将共轭分量相乘以产生每隔一个时隙采样的乘积信号，以产生与sin [2δ（t）]成比例的误差信号。 该信号被施加到本地振荡器以将本地振荡器信号锁定到信息信号的载波。

    Apparatus and method for baseband detection and equalization of information signals
    6.
    发明授权
    Apparatus and method for baseband detection and equalization of information signals 失效
    用于基带检测和信息信号均衡的装置和方法

    公开(公告)号：US3609557A

    公开(公告)日：1971-09-28

    申请号：US3609557D

    申请日：1969-12-08

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： GOELL JAMES E

    IPC: H04L25/03 ,  H04L27/227 ,  H04B1/16

    CPC classification number: H04L27/227 ,  H04L25/03133

    Abstract: Baseband detection and equalization of a signal having arbitrary modulation and distortion is achieved by linearly down-converting the signal to baseband be means of a pair of homodynes driven by a synchronous local oscillator. Each of the homodyne outputs (i.e., the in-phase and out-of-phase components) is equalized by a baseband transversal equalizer comprising a pair of delay lines having a tap separation not greater than 1/ Delta f, where Delta f is the bandwidth over which equalization is desired. The taps of each delay line are coupled through attenuators to a summing network, the output of which is the in-phase (or out-of-phase) component equalized depending on whether the attenuation levels correspond to ( Alpha n,- Beta n) or ( Beta n, Alpha n), respectively, where Alpha n and Beta n are, in a frequencydomain analysis, the coefficients of the Fourier series of the Fourier transform of the system component or apparatus producing the distortion. Alternatively, Alpha n and Beta n can be determined from a time-domain analysis in which Alpha n and Beta n are chosen such that the signal is set to zero at a sufficient number of sampling instants to allow satisfactory transmission.

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