Multi-mode transmitter for highly-spectrally-efficient communications

摘要

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.

主权项

1. A system comprising:
a transmitter that comprises an inter-symbol correlation generating circuit coupled to an amplifier and is configurable to operate in at least two modes, wherein:
while said transmitter is configured into a first of said modes, said inter-symbol correlation generating circuit is configured as a near zero positive inter-symbol interference (ISI) filter; andwhile said transmitter is configured into a second of said modes, said inter-symbol correlation generating circuit is configured to generate an inter-symbol correlated (ISC) signal for which there is correlation among symbols of the ISC signal, and an amount of power back-off used by said amplifier is smaller than a power back-off used by said amplifier while said transmitter is configured into said first of said modes.