2results about "Multiplex code application" patented technology

Systems and methods a system for generating Low-Density Parity-Check (LDPC) code for enabling multiple simultaneous users in Asynchronous Scrambled Coded Multiple Access (ASCMA). The system includes transmitter node with source endpoints, each equipped with an encoder unit generating LDPC codeword bits from information bits. An encoder aggregates LDPC codeword bits with replicated information bits to create an aggregated sequence. A modulator unit modulates the sequence into a waveform for transmission over a shared spectrum access channel. The transmitted waveform is asynchronously sent to a receiver node, which includes a gateway linked to destination endpoints. The receiver unit captures a noise-corrupted version of the waveform, and a decoder unit, using soft-input and soft-output techniques, decodes information bits. A Multi-User Interference (MUI) estimator cancels interference levels, allowing the decoder to recover the original information bits associated with the source endpoints.

Certain aspects of this disclosure provide techniques for conveying a Random Access Response (RAR) for codeword-based Random Access Channel (RACH) communication. An example method for wireless communication by a device includes: transmitting a first signal in one or more first time-frequency resources associated with the RACH, wherein the first signal is multiplexed using a first codeword, the one or more first time-frequency resources and the first codeword defining a first preamble signature; receiving a RAR indicating the first codeword; and communicating with a network entity in response to receiving the RAR.