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US 9,270,416 B2Granted
Multi-mode transmitter for highly-spectrally-efficient communications
AssigneeMagnaCom Ltd.
InventorAmir Eliaz
Life of this patent
Estimating the term…
Abstract
A transmitter may comprise a symbol mapping circuit that is configurable to operate in at least two configurations, wherein a first of the configurations of the symbol mapping circuit uses a first symbol constellation and a second of the configurations of the symbol mapping circuit uses a second symbol constellation. The transmitter may also comprise a pulse shaping circuit that is configurable to operate in at least two configurations, wherein a first of the configurations of the pulse shaping circuit uses a first set of filter taps and a second of the configurations of the pulse shaping circuit uses a second set of filter taps. The first set of filter taps may correspond to a root raised cosine (RRC) filter and the second set of filter taps corresponds to a partial response filter.
Claims23
A system comprising:
- a transmitter configurable to operate in at least two modes, wherein:
- which of said modes said transmitter is configured into is controlled based on:
- feedback or request from a receiver, a measured performance indicator, and/or a command from an application running on a device in which said transmitter is installed;
- while said transmitter is configured into a first of said modes, said transmitter is configured to use a pulse shaping filter configured as a near zero positive ISI filter;
- while said transmitter is configured into a second of said modes, said transmitter is configured to generate an inter-symbol correlated (ISC) signal;
- a symbol constellation used by said transmitter while said transmitter is configured into said first of said modes is the same as a symbol constellation used while said transmitter is configured into said second of said modes;
- said transmitter comprises an amplifier;
- while said transmitter is configured into said first of said modes, a first amount of power back-off is used by said amplifier;
- and
- while said transmitter is configured into said second of said modes, a second amount of power back-off is used by said amplifier.
7 more elements
A method comprising:
- performing in a transmitter configurable to operate in at least two modes:
- controlling into which of said modes said transmitter is configured based on:
- feedback or request from a receiver, a measured performance indicator, and/or a command from an application running on a device in which said transmitter is installed;
- while said transmitter is configured into a first of said modes, mapping bits to symbols using a particular symbol constellation and transmitting said symbols onto a channel using a pulse shaping filter configured as a near zero positive ISI filter;
- while said transmitter is configured into a second of said modes, mapping bits to symbols using said particular symbol constellation and transmitting said symbols onto said channel using a pulse shaping filter configured to generate an inter-symbol correlated (ISC) signal;
- while said transmitter is configured into said first of said modes, amplifying an output of said pulse shaping filter configured as a near zero positive ISI filter using a first amount of power back-off;
- and
- while said transmitter is configured into said second of said modes, amplifying said ISC signal using a second amount of power back-off.
5 more elements
A system comprising:
- a transmitter configurable to operate in at least two modes, wherein:
- which of said modes said transmitter is configured into is controlled based on:
- feedback or request from a receiver;
- a measured performance indicator, and/or an application running on a device in which said transmitter is installed;
- while said transmitter is configured into a first of said modes, said transmitter is configured to use a pulse shaping filter configured as a near zero positive ISI filter;
- while said transmitter is configured into a second of said modes, said transmitter is configured to generate an inter-symbol correlated (ISC) signal;
- a symbol constellation used by said transmitter while said transmitter is configured into said first of said modes is the same as a symbol constellation used while said transmitter is configured into said second of said modes;
- and
- a maximum throughput achievable while said transmitter is configured into said first of said modes is equal to a maximum throughput achievable while said transmitter is configured into said second of said modes.
6 more elements
A system comprising:
- a transmitter configurable to operate in at least two modes, wherein:
- which of said modes said transmitter is configured into is controlled based on:
- feedback or request from a receiver;
- a measured performance indicator, and/or an application running on a device in which said transmitter is installed:
- while said transmitter is configured into a first of said modes, said transmitter is configured to use a pulse shaping filter configured as a near zero positive ISI filter;
- while said transmitter is configured into a second of said modes, said transmitter is configured to generate an inter-symbol correlated (ISC) signal;
- a symbol constellation used by said transmitter while said transmitter is configured into said first of said modes is the same as a symbol constellation used while said transmitter is configured into said second of said modes;
- and
- a bandwidth used by said transmitter while said transmitter is configured into said first of said modes is greater than a bandwidth used by said transmitter while said transmitter is configured into said second of said modes.
6 more elements
A method comprising:
- performing in a transmitter configurable to operate in at least two modes:
- controlling into which of said modes said transmitter is configured based on:
- feedback or request from a receiver, a measured performance indicator, and/or a command from an application running on a device in which said transmitter is installed;
- while said transmitter is configured into a first of said modes, mapping bits to symbols using a particular symbol constellation and transmitting said symbols onto a channel using a pulse shaping filter configured as a near zero positive ISI filter;
- while said transmitter is configured into a second of said modes, mapping bits to symbols using said particular symbol constellation and transmitting said symbols onto said channel using a pulse shaping filter configured to generate an inter-symbol correlated (ISC) signal;
- and
- wherein a maximum throughput achievable while said transmitter is configured into said first of said modes is equal to a maximum throughput achievable while said transmitter is configured into said second of said modes.
4 more elements
A method comprising:
- performing in a transmitter configurable to operate in at least two modes:
- controlling into which of said modes said transmitter is configured based on:
- feedback or request from a receiver, a measured performance indicator, and/or a command from an application running on a device in which said transmitter is installed;
- while said transmitter is configured into a first of said modes, mapping bits to symbols using a particular symbol constellation and transmitting said symbols onto a channel using a pulse shaping filter configured as a near zero positive ISI filter;
- and
- while said transmitter is configured into a second of said modes, mapping bits to symbols using said particular symbol constellation and transmitting said symbols onto said channel using a pulse shaping filter configured to generate an inter-symbol correlated (ISC) signal;
- and
- wherein a bandwidth used by said transmitter while said transmitter is configured into said first of said modes is greater than a bandwidth used by said transmitter while said transmitter is configured into said second of said modes.
5 more elements
Dependencies are inferred from the claim text.