Source: https://patents.google.com/patent/US9621198
Timestamp: 2018-07-23 14:01:00
Document Index: 692120184

Matched Legal Cases: ['§119', 'Application No. 60', 'Application No. 05810124', 'Application No. 05810124', 'Application No. 2007', 'Application No. 2008', 'Application No. 2008', 'Application No. 11000980', 'Application No. 11000980', 'Application No. 10', 'Application No. 10', 'Application No. 2', 'Application No. 2', 'Application No. 10', 'Application No. 200580034464', 'Application No. 2007', 'Application No. 2007', 'Application No. 2008', 'Application No. 2008', 'Application No. 200580034464', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 1209']

US9621198B2 - DMT symbol repetition in the presence of impulse noise - Google Patents
DMT symbol repetition in the presence of impulse noise Download PDF
US9621198B2
US9621198B2 US14559156 US201414559156A US9621198B2 US 9621198 B2 US9621198 B2 US 9621198B2 US 14559156 US14559156 US 14559156 US 201414559156 A US201414559156 A US 201414559156A US 9621198 B2 US9621198 B2 US 9621198B2
US14559156
US20150146821A1 (en )
This application is a continuation of U.S. application Ser. No. 12/769,747, filed Apr. 29, 2010, now U.S. Pat. No. 8,913,649, which is a continuation of U.S. application Ser. No. 11/575,598, filed Mar. 20, 2007, now U.S. Pat. No. 7,796,705, which is a national stage application under 35 U.S.C. 371 of PCT Application No. PCT/US2005/036815, filed Oct. 14, 2005, which claims the benefit of and priority under 35 U.S.C. §119(e) to U.S. Patent Application No. 60/619,618, filed Oct. 15, 2004, entitled “xDSL Initialization in the Presence of Impulse Noise,” each of which are incorporated herein by reference in their entirety.
In accordance with a first exemplary embodiment, DMT symbols that are used to modulate initialization messages are sent a plurality of times. Due to this repeated transmission, if one or more of the DMT symbols are corrupted by impulse noise, the transceiver receiving the DMT symbols can still recover the information therefrom. More specifically, and in cooperation with the DMT symbol repetition module 140, the majority voting module 120 and the modulation/demodulation module 180, a DMT symbol is repeated without modification with the receiving transceiver using a variety of detection/demodulation schemes to recover the message information bits. For example, the receiving transceiver could use a “majority voting” scheme where each DMT symbol is demodulated independently and then the message information bits recovered by examining how many DMT symbols carry the same bit pattern. Alternatively, for example, the DMT symbols could be examined by the DMT symbol inspection and selection module 130 prior to demodulation in the frequency or time domain and based on these signals, the transceiver that received the DMT symbols, in cooperation with the DMT symbol inspection selection module 130, selectes the most likely DMT symbol to be correct. For example, if a DMT symbol was repeated four times and one DMT symbol was corrupted by impulse noise, then the receiving transceiver could examine the four DMT symbols in the frequency domain and clearly detect that one of the four symbols has very different phase and/or amplitude characteristics than the other three DMT symbols. Based on this difference, the receiving transceiver could discard the one DMT symbol that is corrupt and use the remaining three DMT symbols to demodulate and recover the information. Moreover, in order to randomize the signal transmitted from the transmitting transceiver, the repeated DMT symbols can use phase or bit scrambling. With phase scrambling, the repeated DMT symbols can use different phase shifts on the subcarriers in order to randomize the signal. With bit scrambling, the information bits can be scrambled prior to modulating the bits on the repeated DMT symbols.
For the second transceiver, control begins in step S201 and continues to step S203. In step S203, M is received. Next, in step S205, and during initialization, at least one message bit is modulated onto the M repeated DMT symbols. Then, in step S207, the M number of DMT symbols are transmitted. Control then continues to step S211 where the control sequence ends.
1. A method, in a multicarrier transceiver, the method comprising:
receiving at the multicarrier transceiver from another multicarrier transceiver over a connected communications channel a first message indicating a repetition rate for DMT symbols;
modulating at least one bit of a second message onto at least one DMT symbol;
determining a CRC (Cyclic Redundancy Checksum) for the second message;
modulating at least one CRC bit of the CRC for the second message onto at the least one DMT symbol;
repeating the at least one DMT symbol with the modulated at least one CRC bit of the CRC for the second message according to the repetition rate indicated in the first message; and
transmitting from the multicarrier transceiver the repeated DMT symbols with the modulated at least one CRC bit of the CRC for the second message.
2. The method of claim 1, wherein the repetition rate is based on impulse noise levels.
3. The method of claim 1, wherein the repetition rate is based on crosstalk levels.
4. A multicarrier transceiver comprising:
a receiver that receives over a connected communications channel a first message another multicarrier transceiver indicating a repetition rate for DMT symbols;
a modulation module that modulates at least one bit of a second message onto at least one DMT symbol;
a CRC module that determines a CRC (Cyclic Redundancy Checksum) for the second message;
the modulation module further modulating at least one CRC bit of the CRC for the second message onto the at least DMT symbol;
a DMT symbol repetition module that cooperates with the modulation module and repeats the at least one DMT symbol with the modulated at least one CRC bit of the CRC for the second message according to the repetition rate indicated in the first message; and
a transmitter that transmits the repeated DMT symbols with the modulated at least one CRC bit of the CRC for the second message.
5. The transceiver of claim 4, wherein the repetition rate is based on impulse noise levels.
6. The transceiver of claim 4, wherein the repetition rate is based on crosstalk levels.
7. A multicarrier transceiver comprising:
means for receiving at the multicarrier transceiver from another multicarrier transceiver over a connected communications channel a first message indicating a repetition rate for DMT symbols;
means for modulating at least one bit of a second message onto at least one DMT symbol;
means for determining a CRC (Cyclic Redundancy Checksum) for the second message;
means for modulating at least one CRC bit of the CRC for the second message onto at the least one DMT symbol;
means for repeating the at least one DMT symbol with the modulated at least one CRC bit of the CRC for the second message according to the repetition rate indicated in the first message; and
means for transmitting from the multicarrier transceiver the repeated DMT symbols with the modulated at least one CRC bit of the CRC for the second message.
8. The transceiver of claim 7, wherein the repetition rate is based on impulse noise levels.
9. The transceiver of claim 7, wherein the repetition rate is based on crosstalk levels.
10. A non-transitory computer readable information storage media having stored thereon instructions, that when executed by a multicarrier transceiver, cause the multicarrier transceiver to:
receive at the multicarrier transceiver from another multicarrier transceiver over a connected communications channel a first message indicating a repetition rate for DMT symbols;
modulate at least one bit of a second message onto at least one DMT symbol;
determine a CRC (Cyclic Redundancy Checksum) for the second message;
modulate at least one CRC bit of the CRC for the second message onto at the least one DMT symbol;
repeat the at least one DMT symbol with the modulated at least one CRC bit of the CRC for the second message according to the repetition rate indicated in the first message; and
transmit from the multicarrier transceiver the repeated DMT symbols with the modulated at least one CRC bit of the CRC for the second message.
11. The media of claim 10, wherein the repetition rate is based on impulse noise levels.
12. The media of claim 10, wherein the repetition rate is based on crosstalk levels.
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