RU96112180A - METHOD AND DEVICE FOR TRANSMITTING DIGITAL DATA WITH VARIABLE TRANSMISSION SPEED - Google Patents

Claims (9)

1. A device for transmitting bit data of user information with a variable bit rate, comprising coding with repetition for receiving said bit data of user information with a variable bit rate and for adding redundancy to bit data of user information with a variable bit rate to obtain constant symbol repetition data speed adjustable transmission means for receiving said constant-rate repetition symbol data to generate transmission symbols, wherein if said variable-speed data is received at a maximum data rate, said transmission symbols are output with a corresponding maximum symbol energy; if said variable speed data is received at a speed exceeding the nominal data rate, but less than the maximum data rate, then the energy of the respective transmission symbols is scaled in a predetermined ratio, and if said variable speed data is received at a speed lower than the nominal speed transmission of data, then the transmission is carried out at a nominal symbol energy and the transmission of a predetermined portion of said transmission symbols and with the nominal energy of the characters.  2. The device according to claim 1, characterized in that the encoding means with repetition comprises encoding means for receiving bit data of user information and encoding these bit data of user information in accordance with a predetermined encoding format for obtaining encoded characters; overlay coding means for obtaining said coded symbols and providing repetition of these coded symbols for obtaining modulation symbols with repetition at a predetermined constant data rate; a signal encoder for receiving said repetition modulation symbols and for encoding a signal with these repetition modulation symbols to obtain said repetition symbol data at a constant rate.  3. The device according to claim 1, characterized in that the adjustable transmission means comprises a randomizer of data packets for receiving said constant symbol repetition data and for eliminating redundancy of constant symbol repetition data from these data in accordance with the transmission rate of said user information bit data with a variable speed to obtain randomized characters if the bit rate of user information is variable speed to form a randomized characters are less than the nominal data rate; a modulator for modulating randomized symbols to obtain modulated symbols; an adjustable gain amplifier for amplifying modulated symbols in accordance with a gain control signal for receiving transmitted symbols; transmission gain control means for outputting a gain control signal in accordance with a data rate of said user information bit data.  4. A receiver for receiving symbol data with a variable transmission rate, comprising: a demodulator for receiving symbol data and demodulating received symbol data and receiving demodulated symbol data; a repeat adder for receiving demodulated symbol data to provide a set of total energy values, each of these energy values corresponding to the hypothesis of one of the different speeds of said received symbol data; decoding means for receiving total energy values and providing estimates of transmitted bit data of user information in accordance with a predetermined decoding format.  5. The device according to claim 4, characterized in that it comprises means for decoding the signal included between said demodulator and the adder of repetitions for receiving said demodulated symbol data and decoding the signal of these demodulated symbol data in accordance with a predetermined signal decoding format.  6. The device according to p. 4, characterized in that it contains a means of logical combining of taps included between said adder of repetitions and decoding means for receiving said set of total energy values and at least one additional set of total energy values and for combining said at least at least one set of total energy values and at least one additional set of total energy values in accordance with a predetermined combination format.  7. The device according to claim 4, characterized in that it contains a metric generator included between said repetition adder and decoding means for receiving said set of total energy values and outputting a set of metric values corresponding to conditional hypothesis probabilities for the transmitted symbol data.  8. The device according to p. 7, characterized in that the said decoding means is a Viterbi decoder.  9. A communication system for transmitting variable-rate user information bit data, comprising a plurality of transmission means for receiving said variable-rate user information bit data and for introducing redundancy in variable-rate user information bit data to obtain constant-rate repetition data providing appropriate transmission symbols, while if said variable rate data is received at maximum transmission rate data, then said transmission symbols are generated with the corresponding maximum symbol energy; if said variable speed data is received at a speed exceeding the nominal data rate but less than said maximum transmission speed, then the energy of the respective transmission symbols is scaled in a predetermined ratio, and if said variable speed data is received at a speed lower than the nominal speed transmission, the transmission of a predetermined portion of said transmission symbols is excluded; at least one reception means for receiving said transmitted symbol data, demodulating the received symbol data to obtain demodulated symbols, for generating a set of total energy values in accordance with said demodulated symbols, each of said energy values corresponding to a hypothesis about one of the different transmission rates of said received symbol data, and forming estimates of the transmitted bit data of the user information, respectively, mentioned total energy values in accordance with a predetermined decoding format.