University of Texas System

California Institute of Technology

Aria Nosratinia

Dariush Divsalar

Thuy V Nguyen

Yang Li

Mohamed Fadel Shady

Todd E Hunter

Various examples are provided for coherence diversity. In one example, a method includes receiving a product signal transmitted over a plurality of subcarriers, the product signal including a product superposition of a first baseband signal and a second baseband signal; estimating equivalent channel responses for the plurality of subcarriers based upon the pilot symbol in the number of time slots of the plurality of subcarriers; and decoding the second encoded message based at least in part upon the first baseband signal and the equivalent channel responses. The first baseband signal can include a pilot symbol in a number of time slots of at least a portion of the plurality of subcarriers and a first encoded message in a remaining number of time slots of the plurality of subcarriers, and the second baseband signal can include a second encoded message.

Coherence diversity in frequency and time

A method for using superposition in transmission of signals. The method may include receiving, at a first user equipment (UE), a product signal from a transmitter, wherein the product signal comprises a product superposition of a first baseband signal with a first encoded message and a first pilot signal configured for receipt by the first UE and a second baseband signal with a second encoded message and a second pilot signal configured for receipt by a second UE. The method may include estimating, by the first UE using the product signal, a first combined product of the second baseband signal and a first channel coefficient matrix intended for the first UE, wherein estimating is based on the first pilot symbol. The method may include decoding, by the first UE using the first combined product, the first encoded message by removing the second baseband signal from the product signal.

Systems and methods for multiplicative superposition for MIMO broadcast channels

Digital communication coding methods for designing protograph-based bit-interleaved code modulation that is general and applies to any modulation. The general coding framework can support not only multiple rates but also adaptive modulation. The method is a two stage lifting approach. In the first stage, an original protograph is lifted to a slightly larger intermediate protograph. The intermediate protograph is then lifted via a circulant matrix to the expected codeword length to form a protograph-based low-density parity-check code.

High order modulation protograph codes

Digital communication coding methods resulting in rate-compatible low density parity-check (LDPC) codes built from protographs. Described digital coding methods start with a desired code rate and a selection of the numbers of variable nodes and check nodes to be used in the protograph. Constraints are set to satisfy a linear minimum distance growth property for the protograph. All possible edges in the graph are searched for the minimum iterative decoding threshold and the protograph with the lowest iterative decoding threshold is selected. Protographs designed in this manner are used in decode and forward relay channels.

Rate-compatible protograph LDPC codes

A method for providing wireless transmission diversity wherein an error correcting codeword is divided into first and second segments at first and second transmitting units. The first segments are transmitted from each of the first and second transmitting units and received at the first and second transmitting units, respectively. The received first segments are decoded and, responsive to the decoding, transmission of a second segment is made from each of the first and second transmitting units.

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Aria Nosratinia