Method and system for applying dynamic spectral shaping to digital subscriber loop communication systems
AssigneeActelis Networks (Israel) Ltd.
InventorsIoannis Kanellakopoulos, Amit Priebatch, Amit Levy, Maya Bar-El
Life of this patent
Estimating the term…
Abstract
Mitigation of spectral interference in communications systems such as Digital Subscriber Loop (DSL) systems, and in particular mitigation of spectral interference using dynamic spectral shaping (DSS) in DSL systems, and in particular Single-pair High-speed DSL (SHDSL) systems.
Claims77
In a system including a network terminal and a remote terminal connected by one or more communication links, wherein each communication link includes one or more modem transmitters connected to one or more corresponding modem receivers, the method comprising:
- activating the one or more modem transmitters and corresponding modem receivers to achieve a desired bitrate;
- and
- performing at least once on at least one of the one or more communication links:
- obtaining a signal-to-noise ratio (SNR) margin for the one or more modem receivers on the respective communication link,
- determining an excess SNR margin based on an excess of the obtained SNR margin over a desired SNR margin for the one or more modem receivers of the respective communication link,
- modifying constellation size of the corresponding modem transmitter of the communication link to a next available constellation size based on a comparison of the excess SNR margin to a first threshold value, and
- reducing transmission power of the corresponding modem transmitter of the communication link if the excess SNR margin is greater than a second threshold value.
The method of 1, wherein the desired bitrate is a predetermined bitrate.
The method of 1, wherein the desired bitrate is a maximum available bitrate.
A communication system comprising:
- a network terminal including a network terminal (NT) processor operatively connected to one or more network terminal (NT) modems;
- and
- one or more communication links connecting the one or more NT modems, respectively, to one or more respective remote terminal (RT) modems,
- wherein for each of the one or more communication links, the NT processor is adapted to activate the one or more NT modems and corresponding RT modems to achieve a desired bitrate, and to perform the following sequence at least once:
- obtain a signal-to-noise ratio (SNR) margin for the one or more modem receivers on the respective communication link,
- determine an excess SNR margin based on an excess of the obtained SNR margin over a desired SNR margin for the one or more modem receivers of the respective communication link,
- modify constellation size of the corresponding modem transmitter of the respective communication link to a next available constellation size based on a comparison of the excess SNR margin to a first threshold value, and
- reduce transmission power of the corresponding modem transmitter of the respective communication link if the excess SNR margin is greater than a second threshold value.
The system of 18, wherein the desired bitrate is a predetermined bitrate.
The system of 18, wherein the desired bitrate is a maximum available bitrate.
In a system including a network terminal and one or more remote terminals connected by one or more respective communication links, each communication link having a plurality of link segments connected by repeaters, the method comprising:
- activating the link segments to achieve a desired bitrate;
- and
- for each of a plurality of link segments in one or more communication links, performing the following at least once:
- obtaining a signal-to-noise ratio (SNR) margin for the one or more modem receivers on the respective link segment,
- determining an excess SNR margin based on an excess of the obtained SNR margin over a desired SNR margin for the one or more modem receivers of the respective link segment, and
- modifying a first transmission characteristic of the corresponding modem transmitter of the link segment based on a comparison of the excess SNR margin to a first threshold value.
The method of 36, wherein the desired bitrate is a predetermined bitrate.
The method of 36, wherein the desired bitrate is a maximum available bitrate.
A repeatered communication system comprising:
- a network terminal including a network terminal (NT) processor operatively connected to one or more network terminal (NT) modems;
- and
- one or more communication links connecting the network terminal to the remote terminal, each communication link having a plurality of link segments connected by repeaters, each repeater adapted to transmit signal-to-noise data to the NT processor, and adapted to modify at least a first transmission characteristic on the respective link segment based on an instruction from the NT processor,
- wherein for each of the one or more link segments on a communication link, the NT processor is adapted to activate the one or more NT modems and corresponding RT modems to achieve a desired bitrate, and to perform the following sequence at least once:
- obtain a signal-to-noise ratio (SNR) margin for the one or more modem receivers on the respective link segment,
- determine an excess SNR margin based on an excess of the obtained SNR margin over a desired SNR margin for the one or more modem receivers of the respective link segment, and
- modify a first transmission characteristic of the corresponding modem transmitter of the link segment based on a comparison of the excess SNR margin to a first threshold value.
The system of 57, wherein the desired bitrate is a predetermined bitrate.
The system of 57, wherein the desired bitrate is a maximum available bitrate.
Dependencies are inferred from the claim text.