Patents Assigned to California Institute of Technology Texas A & M
  • Rank modulation for flash memories
    Patent number: 8245094
    Abstract: We investigate a novel storage technology, Rank Modulation, for flash memories. In this scheme, a set of n cells stores information in the permutation induced by the different charge levels of the individual cells. The resulting scheme eliminates the need for discrete cell levels, and overshoot errors when programming cells (a serious problem that reduces the writing speed), as well as mitigate the problem of asymmetric errors. We present schemes for Gray codes, rewriting and joint coding in the rank modulation paradigm.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: August 14, 2012
    Assignee: California Institute of Technology Texas A & M
    Inventors: Anxiao Jiang, Robert Mateescu, Moshe Schwartz, Jehoshua Bruck