RF receiver having frequency-hopping/direct-sequence spread spectrum signal discrimination
AssigneeIntermec IP Corp.
InventorsAlan F. Jovanovich, John W. Mensonides, Bruce G. Warren
Life of this patent
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Abstract
A receiver is provided for use in an environment in which both frequency-hopping and direct-sequence spread spectrum radio frequency (RF) signals are present. The receiver includes a receive section adapted to receive and downconvert RF input signals. A detector is coupled to the receive section, and has a plurality of parallel filter stages with each tuned for a distinct frequency band. A discriminator compares the RF energy level passing through each of the filter stages to determine whether the RF input signals are frequency-hopping or direct-sequence spread spectrum signals. A controller is adapted to control the receive section in response to the discriminator.
Claims19
A receiving device for use in an environment in which both frequency-hopping and direct-sequence spread spectrum radio frequency (RF) signals are present, comprising:
- an RF receiver for receiving RF input signals;
- a detector coupled to said receiver and having a plurality of parallel stages, each one of said stages sampling an RF energy level within a distinct band of frequencies;
- and
- a discriminator coupled to said detector for discriminating said RF input signals between frequency-hopping and direct-sequence spread spectrum signals, wherein said RF input signals comprise direct-sequence spread spectrum signals when RF energy is present in more than one of said stages, and said RF input signals comprise frequency-hopping spread spectrum signals when RF energy is present in only one of said stages.
A receiver for use in an environment in which both frequency-hopping and direct-sequence spread spectrum radio frequency (RF) signals are present, comprising:
- means for receiving and downconverting RF input signals;
- and
- means for discriminating said RF input signals between frequency-hopping and direct-sequence spread spectrum signals by sampling energy level present in each one of a plurality of distinct frequency bands, wherein said RF input signals comprise direct-sequence spread spectrum signals when RF energy is present in more than one of said plurality of distinct frequency bands, and said RF input signals comprise frequency-hopping spread spectrum signals when RF energy is present in only one of said distinct frequency bands.
In an environment in which both frequency-hopping and direct-sequence spread spectrum radio frequency (RF) signals are present, a method for receiving data comprises:
- receiving and downconverting RF input signals;
- and
- discriminating said RF input signals between frequency-hopping and direct-sequence spread spectrum signals by sampling energy level present in each one of a plurality of distinct frequency bands, wherein said RF input signals are direct-sequence spread spectrum signals when RF energy is present in more than one of said plurality of distinct frequency bands, and said RF input signals are frequency-hopping spread spectrum signals when RF energy is present in only one of said plurality of distinct frequency bands.
Dependencies are inferred from the claim text.