Method for frequency division duplex communications
First Claim
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1. A method comprising:
- transmitting, by a communications unit, a first data signal, using a first set of orthogonal frequency division multiplexed discrete frequency tones in a first frequency band of a plurality of frequency bands of a channel coupled to the communications unit and during a first set of time intervals, fewer than all time intervals, of a plurality of time intervals of a time division multiple access frame of the channel; and
transmitting, by the communications unit, a second data signal, using a second set of orthogonal frequency division multiplexed discrete frequency tones in a second frequency band of the plurality of frequency bands, and during a second set of time intervals, fewer than all time intervals, of the plurality of time intervals of the time division multiple access frame.
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Abstract
The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system'"'"'s operation. The highly bandwidth-efficient communications method combines a form of time division duplex (TDD), frequency division duplex (FDD), time division multiple access (TDMA), orthogonal frequency division multiplexing (OFDM), spatial diversity, and polarization diversity in various unique combinations. The method provides excellent fade resistance. The method enables changing a user'"'"'s available bandwidth on demand by assigning additional TDMA slots during the user'"'"'s session.
141 Citations
29 Claims
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1. A method comprising:
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transmitting, by a communications unit, a first data signal, using a first set of orthogonal frequency division multiplexed discrete frequency tones in a first frequency band of a plurality of frequency bands of a channel coupled to the communications unit and during a first set of time intervals, fewer than all time intervals, of a plurality of time intervals of a time division multiple access frame of the channel; and transmitting, by the communications unit, a second data signal, using a second set of orthogonal frequency division multiplexed discrete frequency tones in a second frequency band of the plurality of frequency bands, and during a second set of time intervals, fewer than all time intervals, of the plurality of time intervals of the time division multiple access frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
a transmitting module configured to transmit a first data signal, using a first set of a plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a first frequency band of a plurality of frequency bands of a channel coupled to the transmitting module and during a first set of time intervals, fewer than all time intervals, of a plurality of time intervals of a time division multiple access frame of the channel, wherein the transmitting module is configured to transmit a second data signal using a second set of the plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a second frequency band of the plurality of frequency bands, and during a second set of time intervals, fewer than all time intervals, of the plurality of time intervals of the time division multiple access frame. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A method comprising:
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transmitting, by a communications unit, a signal including a first data signal, the first data signal being allocated to a first set of a plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a first frequency band of a plurality of frequency bands of a channel coupled to the communications unit, and during a first set of time intervals, fewer than all time intervals, of a plurality of time intervals of a time division multiple access frame of the channel; and recovering, by the communications unit, a second data signal from a received signal, the second data signal being recovered from a second set of the plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a second frequency band of the plurality of frequency bands and during a second set of time intervals, fewer than all time intervals, of the plurality of time intervals of the time division multiple access frame. - View Dependent Claims (25, 26, 27)
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28. A method comprising:
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transmitting, by a communications unit, a first data signal, using a first set of a plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a first frequency band of a plurality of frequency bands of a channel coupled to the communications unit and during a first set of time intervals, fewer than all time intervals, of a plurality of time intervals of a frame of the channel; and transmitting, by the communications unit, a second data signal, using a second set of the plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a second frequency band of the plurality of frequency bands, and during a second set of time intervals, fewer than all time intervals, of the plurality of time intervals of the frame.
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29. A method comprising:
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transmitting, by a communications unit, a signal including a first data signal, the first data signal being allocated to a first set of a plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a first frequency band of a plurality of frequency bands of a channel coupled to the communications unit, and during a first set of time intervals, fewer than all time intervals, of a plurality of time intervals of a frame of the channel; and recovering, by the communications unit, a second data signal from a received signal, the second data signal being recovered from a second set of the plurality of sets of orthogonal frequency division multiplexed discrete frequency tones in a second frequency band of the plurality of frequency bands and during a second set of time intervals, fewer than all time intervals, of the plurality of time intervals of the frame.
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Specification