Signal processing under attenuated transmission conditions
First Claim
1. A communication system that supports attenuated transmission adaptation, the system comprising:
- a transmitting device that is operable to transmit information using a plurality of active codes, each active code of the plurality of active codes being transmitted using a first power per code;
a receiving device, communicatively coupled to the transmitting device via a communication channel, that is operable to receive transmitted information from the transmitting device;
wherein the receiving device instructs the transmitting device to transmit information using a plurality of permitted codes;
the receiving device instructs the transmitting device to transmit each permitted code of the plurality of permitted codes using a second power per code; and
the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels.
6 Assignments
0 Petitions
Accused Products
Abstract
Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system'"'"'s throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system. In addition, the unused orthogonal signals may be employed to support interference cancellation of those orthogonal signals that are used to transmit information.
16 Citations
82 Claims
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1. A communication system that supports attenuated transmission adaptation, the system comprising:
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a transmitting device that is operable to transmit information using a plurality of active codes, each active code of the plurality of active codes being transmitted using a first power per code; a receiving device, communicatively coupled to the transmitting device via a communication channel, that is operable to receive transmitted information from the transmitting device; wherein the receiving device instructs the transmitting device to transmit information using a plurality of permitted codes; the receiving device instructs the transmitting device to transmit each permitted code of the plurality of permitted codes using a second power per code; and the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM) that is operable to transmit information using a plurality of active codes, each active code of the plurality of active codes being transmitted using a first power per code; a Cable Modem Termination System (CMTS), communicatively coupled to the CM via a communication channel, that is operable to receive transmitted information from the CM; wherein the CMTS instructs the CM to transmit information using a plurality of permitted codes; the CMTS instructs the CM to transmit each permitted code of the plurality of permitted codes using a second power per code; the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; and the CM performs ranging and registering of the communication channel that communicatively couples the CM and the CMTS using a plurality of maximally robust burst parameters and using a robust logical channel, the robust logical channel comprising one of the plurality of logical channels. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An attenuated transmission adaptation method, the method comprising:
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instructing a Cable Modem (CM), using a Cable Modem Termination System (CMTS), to reduce a number of transmit codes from a plurality of active codes to a plurality of permitted codes, the reduction in the number of transmit codes being a reduction factor; instructing the CM to increase a transmitted power per code for each permitted code of the plurality of permitted codes by an inverse of the reduction factor; wherein the CM and the CMTS are communicatively coupled via a communication channel; and the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM); a Cable Modem Termination System (CMTS) that is communicatively coupled to the CM via a communication channel; wherein the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; wherein each logical channel of the plurality of logical channels includes a corresponding plurality of codes; wherein the CM initially transmits information to the CMTS using a first plurality of codes of one logical channel within the plurality of logical channels using a first power per code; wherein the CMTS instructs the CM to transmit subsequent information to the CMTS using a second plurality of codes of the one logical channel within the plurality of logical channels using a second power per code; and wherein, based on the instruction received from the CMTS, the CM subsequently transmits information to the CMTS using the second plurality of codes of the one logical channel within the plurality of logical channels using the second power per code. - View Dependent Claims (51, 52, 53, 54, 55, 56)
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57. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM); a Cable Modem Termination System (CMTS) that is communicatively coupled to the CM via a communication channel; wherein the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; wherein each logical channel of the plurality of logical channels includes a corresponding plurality of codes; wherein the CM initially transmits information to the CMTS using a first plurality of codes of one logical channel within the plurality of logical channels using a first power per code; wherein the CMTS instructs the CM to transmit subsequent information to the CMTS using a second plurality of codes of the one logical channel within the plurality of logical channels using a second power per code; wherein, based on the instruction received from the CMTS, the CM subsequently transmits information to the CMTS using the second plurality of codes of the one logical channel within the plurality of logical channels using the second power per code; wherein the second plurality of codes of the one logical channel is a subset of codes of the first plurality of codes of the one logical channel; wherein the first plurality of codes includes a first number of codes; wherein the second plurality of codes includes a second number of codes; wherein a ratio of the first number divided by the second number being a reduction factor; and wherein a ratio of the second power per code divided by the first power per code also being the reduction factor. - View Dependent Claims (58, 59, 60, 61)
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62. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM); a Cable Modem Termination System (CMTS) that is communicatively coupled to the CM via a communication channel; wherein the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; wherein each logical channel of the plurality of logical channels includes a corresponding plurality of codes; wherein the CM initially transmits information to the CMTS using a first plurality of codes of one logical channel within the plurality of logical channels using a first power per code; wherein the CMTS instructs the CM to transmit subsequent information to the CMTS using a second plurality of codes of the one logical channel within the plurality of logical channels using a second power per code; wherein, based on the instruction received from the CMTS, the CM subsequently transmits information to the CMTS using the second plurality of codes of the one logical channel within the plurality of logical channels using the second power per code; wherein the second plurality of codes of the one logical channel is a subset of codes of the first plurality of codes of the one logical channel; wherein the first plurality of codes includes a first number of codes; wherein the second plurality of codes includes a second number of codes; wherein a ratio of the first number divided by the second number being a reduction factor; wherein a ratio of the second power per code divided by the first power per code also being the reduction factor; wherein the CM initially transmits the information to the CMTS using the first plurality of codes at a first Signal to Noise Ratio (SNR); and wherein the CM subsequently transmits the information to the CMTS using the second plurality of codes at a second SNR that is substantially greater than the first SNR. - View Dependent Claims (63, 64, 65)
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66. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM); a Cable Modem Termination System (CMTS) that is communicatively coupled to the CM via a communication channel; wherein the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; wherein each logical channel of the plurality of logical channels includes a corresponding plurality of codes; wherein the CM initially transmits information to the CMTS using a first logical channel within the plurality of logical channels using a first power per code; wherein the CMTS instructs the CM to perform a channel change from the first logical channel to a second logical channel; and wherein, based on the channel change instruction received from the CMTS, the CM subsequently transmits information to the CMTS using the second logical channel within the plurality of logical channels using a second power per code. - View Dependent Claims (67, 68, 69, 70, 71, 72)
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73. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM); a Cable Modem Termination System (CMTS) that is communicatively coupled to the CM via a communication channel; wherein the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; wherein each logical channel of the plurality of logical channels includes a corresponding plurality of codes; wherein the CM initially transmits information to the CMTS using a first logical channel within the plurality of logical channels using a first power per code; wherein the CMTS instructs the CM to perform a channel change from the first logical channel to a second logical channel; wherein, based on the channel change instruction received from the CMTS, the CM subsequently transmits information to the CMTS using the second logical channel within the plurality of logical channels using a second power per code; wherein the first logical channel includes a first plurality of codes; wherein the second logical channel includes a second plurality of codes; and wherein the second plurality of codes of the second logical channel is a subset of codes of the first plurality of codes of the first logical channel. - View Dependent Claims (74, 75, 76, 77, 78)
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79. A cable modem communication system that supports attenuated transmission adaptation, the system comprising:
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a Cable Modem (CM); a Cable Modem Termination System (CMTS) that is communicatively coupled to the CM via a communication channel; wherein the communication channel comprises a spectrum portion that is partitioned into a plurality of logical channels; wherein each logical channel of the plurality of logical channels includes a corresponding plurality of codes; wherein the CM initially transmits information to the CMTS using a first logical channel within the plurality of logical channels using a first power per code; wherein the CMTS instructs the CM to perform a channel change from the first logical channel to a second logical channel; wherein, based on the channel change instruction received from the CMTS, the CM subsequently transmits information to the CMTS using the second logical channel within the plurality of logical channels using a second power per code; wherein the first logical channel includes a first plurality of codes; wherein the second logical channel includes a second plurality of codes; wherein the second plurality of codes of the second logical channel is a subset of codes of the first plurality of codes of the first logical channel; wherein the first plurality of codes includes a first number of codes; wherein the second plurality of codes includes a second number of codes; wherein a ratio of the first number divided by the second number being a reduction factor; wherein a ratio of the second power per code divided by the first power per code also being the reduction factor; wherein the CM initially transmits the information to the CMTS using the first logical channel at a first Signal to Noise Ratio (SNR); and wherein the CM subsequently transmits the information to the CMTS using the second logical channel at a second SNR that is substantially greater than the first SNR. - View Dependent Claims (80, 81, 82)
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Specification