Claims
- 1. A method of recovering digital data containing successive digital data words that have been trellis-encoded into successive multi carrier frequency waveforms, a respective multi carrier frequency waveform being formed of a plurality of respectively different, simultaneously occurring carrier frequencies that have been selected in accordance with digital code values of a respective one of said successive digital data words, comprising the steps of:
- (a) detecting said successive multi carrier frequency waveforms; and
- (b) processing said successive multi carrier frequency waveforms by means of a trellis decoder to recover said successive digital data words of said digital data.
- 2. A method according to claim 1, wherein said multi carrier waveform contains a prescribed combination of a set of K simultaneously transmitted ones of M respectively different carrier frequencies.
- 3. A method of transmitting data over a communication link from a transmit site to a receive site comprising the steps of:
- (a) at said transmit site, trellis-encoding data to be transmitted into a multi carrier waveform containing a plurality of respectively different, simultaneously occurring carrier frequencies that are selected in accordance an orthogonal signal set of a dimension greater than two; and
- (b) at said receive site, non-coherently detecting and trellis-decoding said waveform to derive said data.
- 4. A method according to claim 3, wherein step (a) comprises trellis-encoding data to be transmitted into said multi carrier waveform as a prescribed combination of a set of K simultaneously transmitted ones of M respectively different carrier frequencies.
- 5. A system for transmitting data over a communication link from a transmit site to a receive site comprising:
- at said transmit site, a trellis-based encoder which is operative to encode successive words of data into successive multi carrier waveforms, a respective multi carrier waveform containing a plurality of respectively different, simultaneously occurring carrier frequencies selected in accordance with digital code values of a respective one of successive digital data words of said data; and
- at said receive site, a non-coherent frequency detector which is operative to detect the respectively different, simultaneously occurring carrier frequencies of said successive multi carrier waveforms, and derive successive digital data words of said data.
- 6. A system according to claim 5, wherein said trellis-based encoder is operative to trellis-encode data to be transmitted into said multi carrier waveform as a prescribed combination of a set of K simultaneously transmitted ones of M respectively different carrier frequencies.
Parent Case Info
This is a continuation of application Ser. No. 08/391,965, filed Feb. 21, 1995--pending.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
Parent |
391965 |
Feb 1995 |
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