Frequency hopping design for single carrier FDMA systems
AssigneeQUALCOMM Incorporated
InventorRavi Palanki
Life of this patent
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Abstract
Systems and methodologies are described that facilitate frequency hopping in a single carrier FDMA wireless environment by dynamically altering user offsets with time to obtain interference diversity. A channel tree can be utilized with nodes that are assigned values. User devices can be assigned to such nodes, a path between an assigned node and a root node in the channel tree can be evaluated, and a table lookup can be performed to determine an identity of a subcarrier set to assign to the user device assigned to a given node, as well as a number of subcarriers to be assigned to the user device. Additionally, node values can be dynamically varied during a communication event to alter path values and thus alter subcarrier set assignments.
Claims56
A method of generating transmission symbols, comprising:
- generating at least one single-carrier FDMA symbol;
- assigning a set of subcarriers to transmit the at least one symbol;
- generating at least one other single carrier FDMA symbol;
- and
- varying subcarrier set assignments according to a predetermined pattern for transmission of the at least one other single-carrier FDMA symbol.
An apparatus that facilitates frequency hopping for single carrier FDMA communication, comprising
- a memory;
- and
- a processor coupled with the memory, the processor configured to assign an offset to a user device and to vary the offset for the user device according to a predetermined pattern.
An apparatus comprising:
- means for generating at least one single-carrier FDMA symbol;
- means for assigning a set of subcarriers to transmit the at least one symbol;
- means for generating at least one other single carrier FDMA symbol;
- and
- means for varying subcarrier set assignments, according to a predetermined pattern for transmission of the at least one other single-carrier FDMA symbol.
A computer-readable medium having stored thereon computer-executable instructions for:
- assigning an offset-related entity to a user device;
- and
- periodically varying the offset for the user device based at least in part on the assigned entity.
A wireless communication device comprising:
- a memory comprising information corresponding to a plurality of offset assignments for transmission of single-carrier FDMA symbols;
- and
- a processor coupled with the memory, the processor configured to vary the offset assignments according to a predetermined pattern based upon the information.
A method of generating transmission symbols, comprising:
- generating at least one single-carrier FDMA symbol at a user device;
- assigning a set of subcarriers to transmit the at least one symbol based upon user information at the user device;
- generating at least one other single carrier FDMA symbol at the user device;
- and
- altering subcarrier set assignments according to a predetermined offset change based upon the information for transmission of the at least one other single-carrier FDMA symbol.
Dependencies are inferred from the claim text.