Apparatus and method for configurable multi-dwell search engine for spread spectrum applications
AssigneeInfineon Technologies AG
InventorKeith Rieken
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Abstract
This invention provides a configurable multi-dwell search engine for performing automated efficient searches of a known code sequence space. Inputs from a multi-dwell table and a finger control table are multiplexed by a first multiplexer. Output from the first multiplexer is used to generate a threshold comparison signal. The generated threshold comparison signal, the current dwell state signal and inputs from a next dwell look-up table are multiplexed by a second multiplexer. The second multiplexer outputs a hard hit signal and a offset control signal.
Claims8
An apparatus for performing searches of a known code sequence space in a spread spectrum system, comprising:
- a multi-dwell table for storing energy estimates, wherein said multi-dwell table is a look-up table including programmable integration length and threshold information for a programmable set of states;
- a finger control table that selects an energy estimate output from said multi-dwell table;
- a comparator that compares said energy estimate output from said multi-dwell table to a magnitude of finger value to generate a threshold comparison result;
- and
- a next dwell table,
- wherein said threshold comparison result is used to select a next state output from said next dwell table for input to said finger control table.
An apparatus for performing searches of a known code sequence space in a spread spectrum system, comprising:
- a multi-dwell table for storing energy estimates;
- a finger control table that selects an energy estimate output from said multi-dwell table, wherein said finger control table is a look-up table including context information and dwell select information for a set of virtual fingers in said spread spectrum systems;
- a comparator that compares said energy estimate output from said multi-dwell table to a magnitude of finger value to generate a threshold comparison result;
- and
- a next dwell table, wherein said threshold comparison result is used to select a next state output from said next dwell table for input to said finger control table.
An apparatus for performing searches of a known code sequence space in a spread spectrum system, comprising:
- a multi-dwell table for storing energy estimates;
- a finger control table that selects an energy estimate output from said multi-dwell table;
- a comparator that compares said energy estimate output from said multi-dwell table to a magnitude of finger value to generate a threshold comparison result;
- a next dwell table, wherein said threshold comparison result is used to select a next state output from said next dwell table for input to said finger control table;
- and
- a multiplexer which includes select nodes and input nodes, wherein said select nodes receive a current state input from said finger control table and said threshold comparison result from said comparator.
An apparatus for performing searches of a known code sequence space in a spread spectrum system, comprising:
- a multi-dwell table for storing energy estimates;
- a finger control table that selects an energy estimate output from said multi-dwell table;
- a comparator that compares said energy estimate output from said multi-dwell table to a magnitude of finger value to generate a threshold comparison result;
- a next dwell table, wherein said threshold comparison result is used to select a next state output from said next dwell table for input to said finger control table;
- and
- a multiplexer which includes select nodes and input nodes, wherein said input nodes receive next dwell information from said next dwell table.
A method for performing searches of a known code sequence space in a spread spectrum system, comprising the steps of:
- selecting an energy estimate from a multi-dwell table using current dwell state information in a finger control table;
- generating a threshold comparison signal;
- coupling said threshold comparison signal and a current dwell state signal to obtain a coupled signal;
- using said coupled signal to select an output from a next dwell table;
- applying the output from the next dwell table to the finger control table to update current dwell state information;
- and
- outputting a hard hit signal from the next dwell table to an external controller for controlling finger allocation.
A method for performing searches of a known code sequence space in a spread spectrum system, comprising the steps of:
- selecting an energy estimate from a multi-dwell table using current dwell state information in a finger control table;
- generating a threshold comparison signal;
- coupling said threshold comparison signal and a current dwell state signal to obtain a coupled signal;
- using said coupled signal to select an output from a next dwell table;
- and
- applying the output from the next dwell table to the finger control table to update current dwell state information;
- and
- outputting an offset control signal from the next dwell table to a searcher control for initiating a next search offset.
Dependencies are inferred from the claim text.