Methods And Apparatus For Reducing A Sampling Rate During A Sampling Phase Determination Process
AssigneeResearch In Motion Limited
InventorXin Jin
Life of this patent
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Abstract
Techniques for use in sampling a signal of a receiver are described. In a sampling determination mode, a signal is sampled at a first sampling period for producing a sample set for each phase of the sampled signal. For each sample set, a correlation process is performed for producing a correlation result. One of the phases associated with an optimal correlation result is identified from the correlation results. In a communication mode, a received signal is sampled at a second sampling period at the phase associated with the optimal correlation result, for recovering user or signaling information from the received signal. The second sampling period is less than the first sampling period.
Claims20
A method for use in sampling a signal of a receiver, the method comprising:
- in a sampling determination mode:
- sampling, in the receiver, a signal at a first sampling period for producing a sample set for each phase of the sampled signal;
- for each sample set, performing a correlation process for producing a correlation result;
- identifying, from the correlation results, one of the phases associated with an optimal correlation result;
- and
- in a communication mode:
- sampling, in the receiver, a received signal at a second sampling period at the phase associated with the optimal correlation result, for use in recovering user or signaling information from the received signal, the second sampling period being less than the first sampling period.
An electronic circuit comprising:
- control circuitry;
- an analog-to-digital converter which includes a sampler;
- the control circuitry being configured to control the sampler, in a sampling determination mode, to sample a signal at a first sampling period, for outputting a sample set for each phase of the sampled signal;
- a pseudorandom noise (PN) generator configured to produce a PN signal;
- a plurality of correlators, each correlator having:
- a first input configured to receive one of the sample sets associated with a corresponding phase of the sampled signal;
- a second input configured to receive the PN signal;
- an output which provides a correlation result from a correlation process between the sample set and the PN signal;
- and
- the control circuitry being further configured to identify, from the correlation results, one of the phases associated with an optimal correlation result;
- and
- the control circuitry being further configured to control the sampler, in a communication mode, to sample a received signal at a second sampling period at the phase associated with the optimal correlation result, for use in recovering user or signaling information from the received signal, the second sampling period being less than the first sampling period.
A communication device, comprising:
- a wireless receiver;
- a frequency synthesizer of the wireless receiver;
- control circuitry coupled to the frequency synthesizer;
- an analog-to-digital converter which includes:
- a sampler;
- a clock input coupled to a clock output of the frequency synthesizer;
- the control circuitry being configured to set the frequency synthesizer, in a sampling determination mode, to produce a clock signal at the clock output so that the sampler samples a signal at a first sampling period, for outputting a sample set for each one of n phases of the sampled signal;
- a pseudorandom noise (PN) generator configured to produce a PN signal;
- a plurality of correlators, each correlator having:
- a first input configured to receive one of the sample sets associated with a corresponding phase of the sampled signal;
- a second input configured to receive the PN signal;
- an output which provides a correlation result from a correlation process between the sample set and the PN signal;
- the control circuitry being further configured to identify, from the correlation results, one of the phases associated with an optimal correlation result;
- and
- the control circuitry being further configured to set the frequency synthesizer, in a communication mode, to produce a clock signal at the clock output so that the sampler samples a received signal at a second sampling period at the phase associated with the optimal correlation result, for use in recovering user or signaling information from the received signal, the second sampling period being less than the first sampling period.
Dependencies are inferred from the claim text.