Apparatus and method for pilot detection
AssigneeKeysight Technologies Singapore (Holdings) Pte. Ltd.
InventorsScott McCulley, Steven Thompson
Life of this patent
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Abstract
Apparatus and method for communication are provided. The solution comprises obtaining as an input a signal; sampling the signal; feeding the sampled signal to a given number of parallel correlators having a given correlation length, controlling the correlation the sampled signal in each correlator with a unique time shift section of the pilot sequence of the communication system, determining the strongest correlation peaks, and determining on the basis of the correlation peaks and corresponding time shifts the strongest pilots in the signal.
Claims18
An apparatus in a code division multiple access based system for detecting pilot sequences, comprising:
- a receiver for receiving a signal;
- a sampling circuit to sample the received signal;
- a plurality of parallel correlators each having a given correlation length, wherein the sampled signal is input into the parallel correlators;
- and
- a controller, wherein the controller:
- controls the correlation the sampled signal in each correlator with a unique time shift section of a pilot sequence of the communication system,
- determines the strongest correlation peaks,
- determines on the basis of the correlation peaks and corresponding time shifts the strongest pilots in the signal,
- determines in the correlators ratios of received pilot energy to total received energy,
- compares a first and a second of the determined ratios, and
- determine, on the basis of the comparison of the determined ratios, a correlation result including a timing from the time shift of the pilot sequence and the time reference of the communication system, wherein the apparatus is configured to feed the sampled signal to N parallel correlators having a correlation length of L, wherein the number of samples required equals A*B where A=32768/N+L and B=the chip rate.
A method in a code division multiple access based system for detecting pilot sequences, comprising:
- obtaining as an input a signal;
- sampling the signal;
- feeding the sampled signal to a plurality of parallel correlators each having a given correlation length;
- controlling the correlation of the sampled signal in each correlator with a unique time shift section of the pilot sequence of the communication system;
- determining the strongest correlation peaks;
- determining on the basis of the correlation peaks and corresponding time shifts the strongest pilots in the signal,
- determining in the correlators ratios of received pilot energy to total received energy;
- comparing a first and a second of the determined ratios;
- determining, on the basis of the comparison of the determined ratios, a correlation result including a timing from the time shift of the pilot sequence and the time reference of the communication system;
- and
- feeding the sampled signal to N parallel correlators having a correlation length of L, wherein the number of samples required equals A*B where A=32768/N+L and B=the chip rate.
A computer program product embodied on a non-transitory distribution medium readable by a computer and comprising program instructions which, when loaded into an apparatus, execute a computer process comprising:
- obtaining as an input a signal;
- sampling the signal;
- feeding the sampled signal to a plurality of parallel correlators each having a given correlation length;
- controlling the correlation the sampled signal in each correlator with a unique time shift section of the pilot sequence of the communication system;
- determining the strongest correlation peaks;
- determining on the basis of the correlation peaks and corresponding time shifts the strongest pilots in the signal,
- determining in the correlators ratios of received pilot energy to total received energy;
- comparing a first and a second of the determined ratios;
- determining, on the basis of the comparison of the determined ratios, a correlation result including a timing from the time shift of the pilot sequence and the time reference of the communication system;
- and
- feeding the sampled signal to N parallel correlators having a correlation length of L, wherein the number of samples required equals A*B where A=32768/N+L and B=the chip rate.
Dependencies are inferred from the claim text.