Multi-mode block-coded modulation/demodulation method
View Patent ↗In digital communications, a multi-mode block-coded modulation/demodulation method carries out adaptive one-way transmission of a multi-mode digital signal by using, between at least two different modes, different settings for level number, level code, set-partitioning method and modulation method that are component elements of a multi-level block-coded modulation system.
1. A multi-mode block-coded modulation/demodulation method for a transmission system equipped with a multi-mode encoder and a multi-mode decoder, comprising the steps of:
determining a transmission mode based on transmission data contents, an amount of data and a required transmission quality;
making changes to a number of code levels, the multi-mode encoder, a modulation system and a signal point assignment method based on the mode;
encoding the data to obtain a signal;
sending the signal;
receiving the signal;
determining a number of trellis states;
decoding the received signal using maximum-likelihood decoding;
inserting information on a transmission mode in a multi-mode digital signal using one or more codes of levels as an encoded mode index or indices; and
changing codes of other levels according to the transmission mode.
2. A method according to claim 1 , further comprising using a mode-index code as a highest level code and using the highest level code for a first bifurcation in a set-partitioning method.
3. A multi-mode block-coded modulation/demodulation method for a transmission system equipped with a multi-mode encoder and a multi-mode decoder, comprising the steps of:
determining a transmission mode based on transmission data contents, an amount of data and a required transmission quality;
making changes to a number of code levels, the multi-mode encoder, a modulation system and a signal point assignment method based on the mode;
encoding the data to obtain a signal;
sending the signal;
receiving the signal;
determining a number of trellis states;
decoding the received signal using maximum-likelihood decoding; and
assigning different bit series to each of identical signal points for different modulation in a signal space diagram to compose a multi-mode system.
4. A method according to claim 1 , further comprising the steps of assigning different bit series to each of identical signal points for different modulation in a signal space diagram to compose a multi-mode system on an encoding side, and on a decoding side using a mode decoding result to determine multiple bit series assignments to identical signal points on a signal space diagram.
5. A method according to claim 1 , further comprising the steps of using a mode-index code as a highest level code and, decoding the highest level code using a multistage decoding method to determine a mode and using a decoded signal for lower-level decoder switching in the multistage decoding method.