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  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3402393
    Description:

    Digital error correcting coding techniques involving the sensing of conditions under which the decoder is operating. In one aspect a monitoring device counts the ones in the decoding decision and in certain parity checks corrected by those decisions. In another aspect the code is supplemented such that one actual decoding error can create a number of apparent errors or ones, which enables early detection of conditions beyond the capability of the decoder. In another aspect fades are detected …

    Date Issued:
    1968-09-17
    Resource Type
    Patent
  • Inventor(s):
    Jimmy K. Omura, James L. Massey
    Patent Number:
    US 4587627
    Description:

    Elements of the finite field GF(2.sup.m) are represented by a vector of m binary digits in such a way that multiplication can be performed by using the same logic function to compute each binary component of the product of two elements, squaring can be performed by logic circuitry that rotates the vector representing the element to be squared, and addition can be performed by logic circuitry that forms the modulo-two sum of the corresponding components of the two vectors representing the elem…

    Date Issued:
    1986-05-06
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey, Jimmy K. Omura
    Patent Number:
    US 4567600
    Description:

    A private message of m bits is conveyed from its sender to its receiver by transmission of a public message of m bits, transmission of a public reply of m bits, and another transmission of a public message of m bits such that only the intended receiver can easily recover the private message from the three public messages. This private message now available to both the sender and intended receiver also allows all subsequent private messages between these two points to require only one public m…

    Date Issued:
    1986-01-28
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3429334
    Description:

    Device for correcting or detecting errors in transmission of signal information, having an information signal memory, an adder for forming redundancy signals from connections between the adder and the memory in accordance with a convolutional code, the device constructed to enable backward or forward decoding of the message.

    Date Issued:
    1969-04-15
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3303333
    Description:

    This invention relates to methods of and aparatus for processing signal information and, more particularly, to the correcting and/or detecting of signal errors or other changes, as produced in transmission.

    Date Issued:
    1967-02-07
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    EP 0486834B1
    Description:

    In a multiple access method for the simultaneous exchange of several data streams ({B.sub.1,m }, {B.sub.2,m }, {B.sub.3,m }) among several participants of a transmission system, various data streams ({B.sub.1,m }, {B.sub.2,m }, {B.sub.3,m }) with the same spread sequence (s[.]) are expanded to a corresponding DSSS signal ({B.sub.1,m s[.]}, {B.sub.2,m s[.]}, {B.sub.3,m s[.]}. During transmission, the various DSSS signals ({B.sub.1,m s[.]}, {B.sub.2,m s[.]}, {B.sub.3,m s[.]}) are heterodyned to…

    Date Issued:
    1990-11-22
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey, Xuejia Lai
    Patent Number:
    EP 0482154B1
    Description:

    The device (12) comprises nine coding stages (61.1, 61.2, 69), the first eight of which are of identical construction. It also comprises a coding partial block generation unit (63), an input unit (21) and an output unit (79). It is used for the blockwise coding of a plain text (X) from an information source (11) into a coded text (Y) to be taken to a transmission line (13), whereby a secret code block (Z) is previously introduced via a secure channel (17). Coding takes place stepwise and in p…

    Date Issued:
    1993-06-30
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey, Xuejia Lai
    Patent Number:
    US 5214703
    Description:

    The device (12) comprises nine encryption stages (61.1, 61.2, 69), the first eight of which are constructed identically. It further comprises a key subblock generation unit (63), an input unit (21), and an output unit (79). It serves for the block-by-block encryption of a plaintext (X) proceeding from a message source (11) into a ciphertext (Y) to be delivered on a transmission line (13), wherein a secret key block (Z) is inputted beforehand via a secure channel 17. The encryption is effected…

    Date Issued:
    1993-05-25
    Resource Type
    Patent
  • Inventor(s):
    Thomas Schaub, James L. Massey
    Patent Number:
    US 4506372
    Description:

    In an apparatus and a method for recognizing the start of a noise-corrupted received telegram signal, and wherein the telegram signal consists of an information-containing sequence of bits ahead of the telegram signal, thereafter transmitting an intermediate sequence of bits following the preliminary sequence, but still ahead of the telegram signal, wherein the preliminary and the intermediate sequences are correlated with different parts of the preliminary and of the intermediate sequence in…

    Date Issued:
    1985-03-19
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 5170412
    Description:

    In a multiple access method for the simultaneous exchange of several data streams ({B.sub.1,m }, {B.sub.2,m }, {B.sub.3,m }) among several participants of a transmission system, various data streams ({B.sub.1,m }, {B.sub.2,m }, {B.sub.3,m }) with the same spread sequence (s[.]) are expanded to a corresponding DSSS signal ({B.sub.1,m s[.]}, {B.sub.2,m s[.]}, {B.sub.3,m s[.]}. During transmission, the various DSSS signals ({B.sub.1,m s[.]}, {B.sub.2,m s[.]}, {B.sub.3,m s[.]}) are heterodyned to…

    Date Issued:
    1992-12-08
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3566352
    Description:

    Error correction in convolutionally coded messages, using a plurality of information digit streams and a single parity digital stream with each information digit being included as a component in the defining summation for exactly two parity digits spaced apart by a certain number of time intervals (a time interval being defined to include a digit from each stream), the time interval spacing between the two parity digits being the same for each information digit in a given stream but different…

    Date Issued:
    1971-02-23
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3500320
    Description:

    Bursts of errors in convolutionally coded messages are corrected by a decoder in which a parity checking circuit determines whether selected syndrome digits which lie within the constraint length of the code form a codeword in a linear block code having as its codewords the set of all patterns of said selected syndrome digits that are consistent with any error burst pattern confined to the beginning of said constraint length and upon the presence of such a codeword, error detecting and correc…

    Date Issued:
    1970-03-10
    Resource Type
    Patent