Multi-carrier transmission systems
First Claim
1. A multi-carrier transmission system comprising a first and a second transceiver, each of said transceivers having a receiver and a transmitter, wherein data is transmitted between said transceivers by modulating said data onto a multiplicity of carrier waves in the form of multi-bit symbols, wherein each carrier wave constitutes a channel, and wherein the number of bits per symbol, varies between channels and, within a channel, with time, so that each channel has associated therewith a bit loading parameter, characterized in that, in operation, said multi-carrier system is adapted to synchronously update, at said first and second transceivers, the bit loading parameters associated with each channel by transmission of data over a control channel, in that said control channel is established, at system start-up that includes activation of said multi-carrier system, on a predetermined one of said multiplicity of carrier waves whose identity is known to said first and second transceivers, said first and second transceivers for performing the followingbooting said transmitter and continuously transmitting frames in which all carrier waves other than said predetermined wave are modulated with random data, said transmitter also transmitting a system heartbeat, booting said receiver and initiating channel equalization, synchronizing clocks in said first and second transceivers, and establishing said control channel on said predetermined carrier wave on receipt of the system heartbeat, transferring said control channel to a carrier wave selected by said multi-carrier system and enabling bit loading control, and enabling all carrier waves, and in that said control channel is, after start-up, changed from said predetermined channel to a further channel, selected by said first transceiver on the basis of channel characteristics.
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Accused Products
Abstract
A multi-carrier transmission system has a plurality of transceivers, each having a receiver and a transmitter. Data is transmitted between the transceivers by modulating the data onto a multiplicity of carrier waves in the form of multi-bit symbols, wherein each carrier wave constitutes a channel, and wherein the number of bits per symbol (the bit loading), varies between channels and, within a channel, with time, so that each channel has associated therewith a bit loading parameter. In operation, the multi-carrier system is adapted to synchronously update, at the transceivers, the bit loading parameters associated with each channel by transmission of data over a control channel, in that the control channel is established, at system start-up, on a predetermined one of the multiplicity of carrier waves whose identity is known to the transceivers, and in that the control channel is, after start-up, changed from the predetermined channel to a further channel, selected by the first transceiver on the basis of channel characteristics.
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Citations
28 Claims
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1. A multi-carrier transmission system comprising a first and a second transceiver, each of said transceivers having a receiver and a transmitter, wherein data is transmitted between said transceivers by modulating said data onto a multiplicity of carrier waves in the form of multi-bit symbols, wherein each carrier wave constitutes a channel, and wherein the number of bits per symbol, varies between channels and, within a channel, with time, so that each channel has associated therewith a bit loading parameter, characterized in that, in operation, said multi-carrier system is adapted to synchronously update, at said first and second transceivers, the bit loading parameters associated with each channel by transmission of data over a control channel, in that said control channel is established, at system start-up that includes activation of said multi-carrier system, on a predetermined one of said multiplicity of carrier waves whose identity is known to said first and second transceivers, said first and second transceivers for performing the following
booting said transmitter and continuously transmitting frames in which all carrier waves other than said predetermined wave are modulated with random data, said transmitter also transmitting a system heartbeat, booting said receiver and initiating channel equalization, synchronizing clocks in said first and second transceivers, and establishing said control channel on said predetermined carrier wave on receipt of the system heartbeat, transferring said control channel to a carrier wave selected by said multi-carrier system and enabling bit loading control, and enabling all carrier waves, and in that said control channel is, after start-up, changed from said predetermined channel to a further channel, selected by said first transceiver on the basis of channel characteristics.
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15. In a multi-carrier transmission system having a first and a second transceiver, each of said transceivers having a receives and a transmitter, wherein data is transmitted between said transceivers by modulating said data onto a multiplicity of carrier waves in the form of multi-bit symbols, wherein each of said carrier waves constitutes a channel, and wherein the number of bits per symbol, (the bit loading), varies between channels and, within a channel, with time, so that each channel has associated therewith a bit loading parameter, a method of operating a control channel characterized by:
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synchronously updating, at said first and second transceivers, the bit loading parameters associated with each channel by transmission of data over the control channel;
establishing said control channel, at system start-up that includes activation of said multi-carrier system, on a predetermined one of said multiplicity of carrier waves whose identity is known to said first and second transceivers, and comprising booting said transmitter and continuously transmitting frames in which all carrier waves other than said predetermined wave are modulated with random data, said transmitter also transmitting a system heartbeat, booting said receiver and initiating channel equalization, synchronizing clocks in said first and second transceivers, and establishing said control channel on said predetermined carrier wave on receipt of the system heartbeat, transferring said control channel to a carrier wave selected by said multi-carrier system and enabling bit loading control, and enabling all carrier waves; and
after start-up, changing said control channel from said predetermined channel to a further channel, selected by said first transceiver on the basis of channel characteristics. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification