Time tracking for a receiver with guard interval correlation

A method comprising:

• detecting for a first arriving path (FAP) and a last arriving path (LAP) in a communication channel;
• performing correlation on received data for a first hypothesis corresponding to the FAP and LAP being correctly detected;
• performing correlation on the received data for a second hypothesis corresponding to the FAP and LAP being incorrectly detected;
• and
• determining a correct hypothesis among the first and second hypotheses based on correlation results for the first and second hypotheses;
• wherein the received data includes at least two data segments, wherein the two data segments carry copies of the same data, and wherein the correlation is between a first segment of data within a correlation window and a second segment of data expected to contain at least one copy of the same data, the second segment of data separated from the first segment of data by symbol data samples;
• wherein performing correlation on the received data comprises determining hypothesized FAP and LAP for each hypothesis based on the detected FAP and LAP.

An apparatus comprising:

• means for detecting for a first arriving path (FAP) and a last arriving path (LAP) in a communication channel;
• means for performing correlation on received data for a first hypothesis corresponding to the FAP and LAP being correctly detected;
• means for performing correlation on the received data for a second hypothesis corresponding to the FAP and LAP being incorrectly detected;
• and
• means for determining a correct hypothesis among the first and second hypotheses based on correlation results for the first and second hypotheses;
• wherein the received data includes at least two data segments, wherein the two data segments carry copies of the same data, and wherein the correlation is between a first segment of data within a correlation window and a second segment of data expected to contain at least one copy of the same data, the second segment of data separated from the first segment of data by symbol data samples;
• wherein the means for performing correlation on the received data comprise means for determining hypothesized FAP and LAP for each hypothesis based on the detected FAP and LAP.

A processor readable media for storing instructions operable to:

• detect for a first arriving path (FAP) and a last arriving path (LAP) in a communication channel;
• perform correlation on received data for a first hypothesis corresponding to the FAP and LAP being correctly detected;
• perform correlation on the received data for a second hypothesis corresponding to the FAP and LAP being incorrectly detected;
• determine a correct hypothesis among the first and second hypotheses based on correlation results for the first and second hypotheses;
• wherein the received data includes at least two data segments, wherein the two data segments carry copies of the same data, and wherein the correlation is between a first segment of data within a correlation window and a second segment of data expected to contain at least one copy of the same data, the second segment of data separated from the first segment of data by symbol data;
• and
• determine a first correlation window for the first hypothesis and a second correlation window for the second hypothesis based on the detected FAP and LAP.

An apparatus comprising:

• at least one processor configured to determine first and second channel taps for an impulse response of a communication channel, to perform correlation on received data for a first hypothesis corresponding to the first channel tap being earlier than the second channel tap, to perform correlation on the received data for a second hypothesis corresponding to the first channel tap being later than the second channel tap, and to determine whether the first channel tap is earlier or later than the second channel tap based on correlation results for the first and second hypotheses;
• and
• a memory coupled to the at least one processor;
• wherein the received data includes at least two data segments, wherein the two data segments carry copies of the same data, and wherein the correlation is between a first segment of data within a correlation window and a second segment of data expected to contain at least one copy of the same data, the second segment of data separated from the first segment of data by symbol data samples;
• wherein for each hypothesis the at least one processor is configured to determine a correlation window for the hypothesis to cover a portion of a guard interval for the first channel tap, a portion of a guard interval for the second channel tap, or both, and to perform correlation for the hypothesis based on the correlation window.

An apparatus comprising:

• at least one processor configured to detect for a first arriving path (FAP) and a last arriving path (LAP) in a communication channel to select a hypothesis for the FAP and LAP for evaluation, to perform correlation on the received data for the selected hypothesis corresponding to the FAP and LAP, and to determine whether the selected hypothesis is a correct hypothesis based on correlation result for the selected hypothesis;
• and
• a memory coupled to the at least one processor;
• wherein the received data includes at least two data segments, wherein the two data segments carry copies of the same data, and wherein the correlation is between a first segment of data within a correlation window and a second segment of data expected to contain at least one copy of the same data, the second segment of data separated from the first segment of data by symbol data samples;
• wherein the at least one processor is configured to determine hypothesized FAP and LAP for each hypothesis based on the detected FAP and LAP.

An apparatus comprising:

• means for detecting for a first arriving path (FAP) and a last arriving path (LAP) in a communication channel;
• means for selecting a hypothesis for the FAP and LAP for evaluation;
• means for performing correlation on the received data for the selected hypothesis corresponding to the FAP and LAP;
• and
• means for determining whether the selected hypothesis is a correct hypothesis based on correlation result for the selected hypothesis;
• wherein the received data includes at least two data segments, wherein the two data segments carry copies of the same data, and wherein the correlation is between a first segment of data within a correlation window and a second segment of data expected to contain at least one copy of the same data, the second segment of data separated from the first segment of data by symbol data samples;
• wherein the means for performing correlation on the received data comprise means for determining hypothesized FAP and LAP for each hypothesis based on the detected FAP and LAP.