US 8,233,554 B2 · Increased capacity communications for OFDM-based wireless communications systems/methods/devices

Abstract

Numerous embodiments are provided that may be used to provide enhanced capacity and/or Quality-of-Service for OFDM-based systems such as LTE and/or WiMAX. Various service/device modes and/or applications are also provided. According to embodiments of the invention, a transformation may be performed on a data vector by a transmitter, prior to the transmitter transmitting the data vector, to distribute elements of the data vector over an available frequency space, thus providing robustness to channel anomalies such as fading and/or interference. The transformation may be based upon a Fourier transform or a truncated Butler matrix. At a receiver, an inverse of the transformation may be applied to recover data. The receiver and/or transmitter may be configured with an antenna array that may comprise a two-dimensional lattice of antenna elements, and may further be configured to estimate a number of resolvable signal paths and to form a spatial filter/rake that is matched to the number of resolvable signal paths. Embodiments relating to architectures, systems, methods, devices, software, firmware and/or computer program products are provided.

Claims48

Dependent claims

A communications method comprising:

forming a data vector comprising N data elements;
N≧2;
subjecting the data vector to a transformation and forming a transformed vector responsive to said subjecting;
inserting at least one pilot symbol into the transformed vector and forming an augmented vector responsive to said inserting;
and
transmitting by a transmitter the augmented vector;
wherein subjecting the data vector to a transformation occurs prior to said inserting at least one pilot symbol into the transformed vector and forming an augmented vector and wherein transmitting by a transmitter the augmented vector comprises transmitting by the transmitter simultaneously in time a plurality of sub-carriers;
wherein the transformation distributes an element/component/dimension of the data vector over a plurality of elements/components/dimensions of the transformed vector;
and
wherein an element/component/dimension of the transformed vector comprises a superposition of values of a plurality of elements/components/dimensions of the data vector.

7 more elements

Dependencies are inferred from the claim text.

Increased capacity communications for OFDM-based wireless communications systems/methods/devices

Life of this patent

Increased capacity communications for OFDM-based wireless communications systems/methods/devices

Life of this patent

Abstract

Claims48