DMT symbol repetition in the presence of impulse noise
With the current initialization procedures defined in the VDSL and ADSL standards, even though the xDSL system could operate in Showtime in an impulse noise environment where symbols are being corrupted, the transceivers would not be able to reach Showtime because initialization would fail due to initialization message failure. Through the use of an improved initialization procedure for communication systems, operation in environments with higher levels of impulse noise is possible.
1. A multicarrier transceiver comprising:
a receiver capable of determining a repetition rate for DMT (Discrete Multitone Modulation) symbols;
a transmitter capable of transmitting a first message during initialization, wherein the message indicates the repetition rate;
the receiver further capable of receiving a second message during initialization, wherein DMT symbols in the second message are repeated in accordance with the repetition rate indicated in the first message,
wherein the message comprises a plurality of CRC (Cyclic Redundancy Check) bits, and
wherein at least one DMT symbol in the second message comprises one CRC byte and no information bits.
2. The transceiver of claim 1 , wherein the receiver is capable of determining the repetition rate based on an INP (Impulse Noise Protection) value.
3. The transceiver of claim 1 , wherein the receiver is capable of determining the repetition rate based on impulse noise measurements.
4. The transceiver of claim 1 , wherein the receiver is capable of determining the repetition rate based on crosstalk measurements.
5. A multicarrier transceiver comprising:
a receiver capable of determining a repetition rate for DMT (Discrete Multitone Modulation) symbols;
a transmitter capable of transmitting a first message during initialization, wherein the message indicates the repetition rate;
the transmitter further capable of transmitting a second message during initialization, wherein DMT symbols in the second message are repeated in accordance with the repetition rate indicated in the first message, and
wherein the message comprises a plurality of CRC (Cyclic Redundancy Check) bits and wherein at least one DMT symbol in the second message comprises one CRC byte and no information bits.
6. The transceiver of claim 5 , wherein the receiver is capable of determining the repetition rate based on an INP (Impulse Noise Protection) value.
7. The transceiver of claim 5 , wherein the receiver is capable of determining the repetition rate based on impulse noise measurements.
8. The transceiver of claim 5 , wherein the receiver is capable of determining the repetition rate based on crosstalk measurements.
9. A non-transitory computer-readable information storage media, having stored thereon instructions, that when executed by one or more processors in a transceiver, cause to be performed a method comprising:
determining, by a receiver, a repetition rate for DMT (Discrete Multitone Modulation) symbols;
transmitting, by a transmitter, a first message during initialization, wherein the message indicates the repetition rate;
receiving, by the receiver, a second message during initialization, wherein DMT symbols in the second message are repeated in accordance with the repetition rate indicated in the first message, and
wherein the message comprises a plurality of CRC (Cyclic Redundancy Check) bits and wherein at least one DMT symbol in the second message comprises one CRC byte and no information bits.
10. The non-transitory computer-readable information storage media of claim 9 , wherein the determining of the repetition rate is based on an INP (Impulse Noise Protection) value.
11. The non-transitory computer-readable information storage media of claim 9 , wherein the determining of the repetition rate is based on impulse noise measurements.
12. A non-transitory computer-readable information storage media, having stored thereon instructions, that when executed by one or more processors in a transceiver, cause to be performed a method comprising:
determining, by a receiver, a repetition rate for DMT (Discrete Multitone Modulation) symbols;
transmitting, by a transmitter, a first message during initialization, wherein the message indicates the repetition rate;
transmitting, by the transmitter, a second message during initialization, wherein DMT symbols in the second message are repeated in accordance with the repetition rate indicated in the first message,
wherein the message comprises a plurality of CRC (Cyclic Redundancy Check) bits and wherein at least one DMT symbol in the second message comprises one CRC byte and no information bits.
13. The non-transitory computer-readable information storage media of claim 12 , wherein the determining of the repetition rate is based on an INP (Impulse Noise Protection) value.
14. The non-transitory computer-readable information storage media of claim 12 , wherein the determining of the repetition rate is based on impulse noise measurements.
15. A multicarrier transceiver comprising:
a receiver capable of determining, during initialization, a repetition rate for DMT (Discrete Multitone Modulation) symbols;
a transmitter capable of transmitting a first message during initialization, wherein the message indicates the repetition rate;
the receiver further capable of receiving a second message during initialization, wherein DMT symbols in the second message are repeated in accordance with the repetition rate indicated in the first message,
wherein the message comprises a plurality of CRC (Cyclic Redundancy Check) bits,
wherein at least one DMT symbol in the second message comprises one CRC byte and no information bits.
16. The transceiver of claim 15 , wherein the receiver is capable of determining the repetition rate based on an INP (Impulse Noise Protection) value.
17. The transceiver of claim 15 , wherein the receiver is capable of determining the repetition rate based on impulse noise measurements.
18. The transceiver of claim 15 , wherein the receiver is capable of determining the repetition rate based on crosstalk measurements.
19. A multicarrier transceiver comprising:
a receiver capable of determining, during initialization, a repetition rate for DMT (Discrete Multitone Modulation) symbols;
a transmitter capable of transmitting a first message during initialization, wherein the message indicates the repetition rate;
the transmitter further capable of transmitting a second message during initialization, wherein DMT symbols in the second message are repeated in accordance with the repetition rate indicated in the first message, and
wherein the message comprises a plurality of CRC (Cyclic Redundancy Check) bits and wherein at least one DMT symbol in the second message comprises one CRC byte and no information bits.
20. The transceiver of claim 19 , wherein the receiver is capable of determining the repetition rate based on an INP (Impulse Noise Protection) value.
21. The transceiver of claim 19 , wherein the receiver is capable of determining the repetition rate based on impulse noise measurements.
22. The transceiver of claim 19 , wherein the receiver is capable of determining the repetition rate based on crosstalk measurements.