Methods and apparatus for determining minimum cyclicprefix durations
First Claim
1. A method for use with a communication system including a plurality of subcarrier signal paths, a common signal path and a communications channel having a communications channel group signal delay, the method comprising the steps of:
- operating a processing device to calculate a subcarrier signal path group signal delay introduced by a first one of the subcarrier signal paths;
operating said processing device to calculate a common signal path group signal delay introduced by the common signal path;
generating, as a function of the calculated subcarrier signal path group signal delay, calculated common signal path group signal delay, and communications channel group signal delay, a minimum cyclic prefix duration.
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Accused Products
Abstract
Methods and apparatus for generating and transmitting frequency division multiplexed signals are described. Each transmitted FDM signal is generated by combining, e.g., multiplexing, a plurality of individual analog subcarrier signals together. Individual analog subcarrier signals are generated by processing one or more digital signals, e.g., symbols plus a cyclic prefix for each symbol, corresponding to the subcarrier to generate an analog subcarrier signal there from. A cyclic prefix incorporated into subcarrier signals is designed to be of sufficient length that it covers delays introduced by filters in the individual subcarrier signal paths and common signal path. The incorporated cyclic prefix has a minimum duration determined as a function of several group signal dealys including a common signal path group signal delay and a communications channel group signal delay.
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Citations
7 Claims
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1. A method for use with a communication system including a plurality of subcarrier signal paths, a common signal path and a communications channel having a communications channel group signal delay, the method comprising the steps of:
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operating a processing device to calculate a subcarrier signal path group signal delay introduced by a first one of the subcarrier signal paths; operating said processing device to calculate a common signal path group signal delay introduced by the common signal path; generating, as a function of the calculated subcarrier signal path group signal delay, calculated common signal path group signal delay, and communications channel group signal delay, a minimum cyclic prefix duration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification