Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels
AssigneeCalifornia Institute of Technology
InventorsDariush Divsalar, Marvin K. Simon
Life of this patent
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Abstract
A trellis coded multilevel differential phase shift keyed mobile communication system. The system of the present invention includes a trellis encoder for translating input signals into trellis codes; a differential encoder for differentially encoding the trellis coded signals; a transmitter for transmitting the differentially encoded trellis coded signals; a receiver for receiving the transmitted signals; a differential demodulator for demodulating the received differentially encoded trellis coded signals; and a trellis decoder for decoding the differentially demodulated signals.
Claims24
A transmitter for a trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- multiple trellis encoder means for translating input signals into multiple trellis codes;
- differential encoder means for differentially encoding said multiple trellis coded signals;
- and
- means for transmitting said differentially encoded multiple trellis coded signals.
A transmitter for a trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- a multiple trellis encoder for translating input signals into multiple trellis codes;
- first interleaving means for interleaving said multiple trellis encoded signals;
- differential encoder means for differentially encoding said interleaved multiple trellis encoded signals;
- M-ary phase shift keyed modulator means for modulating said differentially encoded signals;
- and
- means for transmitting said modulated signals.
A receiver for a trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- receiver means for receiving differentially encoded multiple trellis coded signals;
- differential demodulator means for demodulating said received differentially encoded trellis coded signals;
- and
- multiple trellis decoder means for decoding said differentially demodulated signals.
A receiver for a trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- receiver means for receiving differentially encoded multiple trellis coded signals;
- differential demodulator means for demodulating said received differentially encoded multiple trellis coded signals, said demodulator means including a differential detector and doppler estimator means for estimating and removing doppler induced phase shift from said received signals;
- deinterleaving means for deinterleaving said received signals;
- and
- multiple trellis decoder means for decoding said differentially demodulated signals.
A trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- multiple trellis encoder means for translating input signal into multiple trellis codes;
- differential encoder means for differentially encoding said multiple trellis coded signals;
- means for transmitting said differentially encoded multiple trellis coded signals;
- receiver means for receiving said transmitted signals;
- differential demodulator means for demodulating said received differentially encoded multiple trellis coded signals, said differential demodulator means including a dopple estimator means for estimating and removing doppler induced phase shift from said received signals;
- and
- multiple trellis decoder means for decoding said differentially demodulated signals.
A trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- trellis encoder for translating input signals into trellis codes;
- first interleaving means for interleaving said trellis encoded signals;
- differential encoder means for differentially encoding said interleaved signals;
- M-ary phase shift keyed modulator means for modulating said differentially encoded signals;
- means for transmitting said modulated signals;
- receiver means for receiving said transmitted signals;
- differential demodulator means for demodulating said received differentially encoded trellis coded signals, said demodulator means including a differential detector and doppler estimator means for estimating and removing doppler induced phase shift from said received signals;
- deinterleaving means for deinterleaving said received signals;
- and
- trellis decoder means for decoding said differentially demodulated signals.
A receiver for a trellis coded multilevel differential phase shift keyed mobile communication system comprising:
- receiver means for receiving differentially encoded multiple trellis coded signals;
- differential demodulator means for demodulating said received differentially encoded multiple trellis coded signals;
- doppler estimator means in communication with said differential demodulator means for estimating and removing doppler induced phase shift from said received signals;
- and
- multiple trellis decoder means for decoding said differentially demodulated signals.
Dependencies are inferred from the claim text.