Time domain equalization for discrete multi-tone systems
AssigneeTellabs Operations, Inc.
InventorsGopal Harikumar, Daniel J. Marchok, Kenneth J. Rudofski
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Abstract
A multiple carrier communication system includes a primary impulse shortening filter that receives an output signal of an analog to digital converter and accepts coefficients. A secondary impulse shortening filter receives the output signal of the analog to digital converter, outputs an output signal, and passes coefficients to the primary impulse shortening filter. A reference signal generator outputs a reference signal. A comparator compares the output signal and the reference signal and outputs a resulting error signal. An adaptive processor computes coefficients for the secondary impulse shortening filter based on the error signal.
Claims2
A method for adapting a primary impulse shortening filter in a multiple carrier communication system, the method comprising:
- selecting a first cyclic prefix length for the communication system from a set of candidate lengths,
- transmitting data having a cyclic prefix of the first selected length to a receiver,
- computing a first maximum bit rate value in the receiver for the first selected length,
- sending the first maximum bit rate value to the transmitter,
- selecting a second cyclic prefix length for the communication system from the set of candidate lengths,
- transmitting data having a cyclic prefix of the second selected length to a receiver,
- computing a second maximum bit rate value in the receiver for the second selected length,
- sending the second maximum bit rate value to the transmitter,
- comparing the first maximum bit rate value to the second maximum bit rate value, and
- selecting the cyclic prefix length corresponding to the greater of the first and second maximum bit rate values.
Dependencies are inferred from the claim text.