Demodulator, receiver, and communication system

A demodulator comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• and
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the power.

A demodulator comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a ρ-multiplying unit which multiplies the detected power by ρ;
• and
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the ρ-multiplied value of the power.

A receiver which receives data from a transmitter, said receiver comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a soft decision demodulated data estimating unit which estimates a transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence and survival path metric that transit into each state on the trellis diagram;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data.

A receiver which receives data from a transmitter, said receiver comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a soft decision demodulated data estimating unit which estimates a transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence and survival path metric that transit into each state on the trellis diagram;
• and
• an interleaving unit which interleaves the soft decision demodulated data according to a predetermined algorithm;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data after the interleaving.

A receiver which receives data from a transmitter, said receiver comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the power;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data.

A receiver which receives data from a transmitter, said receiver comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the power;
• and
• an interleaving unit which interleaves the soft decision demodulated data according to a predetermined algorithm;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data after the interleaving.

A receiver which receives data from a transmitter, said receiver comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a ρ-multiplying unit which multiplies the power by ρ;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the ρ-multiplied value of the power;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data.

A receiver which receives data from a transmitter, said receiver comprising:

• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects a power of the received signal;
• a ρ-multiplying unit which multiplies the power by ρ;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the ρ-multiplied value of the power;
• and
• an interleaving unit which interleaves the soft decision demodulated data according to a predetermined algorithm;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data after the interleaving.

A communication system comprising a transmitter for transmitting a data and a receiver for receiving the data, wherein

• said transmitter having,
• a convolutional coding unit which convolutional encodes the transmitted data;
• a converting unit which converts the convolutional-coded data into a transmission differential phase;
• a differential coding unit which differential encodes the transmission differential phase and maps the differential encoded data to the signal phases;
• and
• a transmission signal generation/output unit which generates/outputs a differential phase modulated signal based on the transmission signal phase,
• said receiver having,
• a multiple differential phase detection signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a soft decision demodulated data estimating unit which estimates a transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence and survival path metric that transit into each state on the trellis diagram;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data.

A communication system comprising a transmitter for transmitting a data and a receiver for receiving the data, wherein

• said transmitter having,
• a convolutional coding unit which convolutional encodes the transmitted of the data;
• a first interleaving unit which interleaves an order of the convolutional-coded data according to a predetermined algorithm;
• a converting unit which converts the interleaved data into a transmission differential phase;
• a differential coding unit which differential encodes the transmission differential phase and maps the differential encoded data to the signal phases;
• and
• a transmission signal generation/output unit which generates/outputs a differential phase modulated signal based on the transmission signal phase,
• said receiver having,
• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a soft decision demodulated data estimating unit which estimates a transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence and survival path metric that transit into each state on the trellis diagram;
• and
• a second interleaving unit which interleaves the soft decision demodulated data according to a predetermined algorithm;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data after the interleaving.

A communication system comprising a transmitter for transmitting a data and a receiver for receiving the data, wherein

• said transmitter having,
• a convolutional coding unit which performs convolutional encodes the transmitted of the data;
• a converting unit which converts the convolutional-coded data into a transmission differential phase;
• a differential coding unit which differential encodes the transmission differential phase and maps the differential encoded data to the signal phases;
• and
• a transmission signal generation/output unit which generates/outputs a differential phase modulated signal based on the transmission signal phase,
• said receiver having,
• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the power;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data.

A communication system comprising a transmitter for transmitting a data and a receiver for receiving the data, wherein

• said transmitter having,
• a convolutional coding unit which convolutional encodes the transmitted data;
• a first interleaving unit which interleaves an order of the convolutional-coded data according to a predetermined algorithm;
• a converting unit which converts the interleaved data into a transmission differential phase;
• a differential coding unit which differential encodes the transmission differential phase and maps the differential encoded data to the signal phases;
• and
• a transmission signal generation/output unit which generates/outputs a differential phase modulated signal based on the transmission signal phase,
• said receiver having,
• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the power;
• and
• a second interleaving unit which interleaves the soft decision demodulated data according to a predetermined algorithm;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data after the interleaving.

A communication system comprising a transmitter for transmitting a data and a receiver for receiving the data, wherein

• said transmitter having,
• a convolutional coding unit which performs convolutional encodes the transmitted data;
• a converting unit which converts the convolutional-coded data into a transmission differential phase;
• a differential coding unit which differential encodes the transmission differential phase and maps the differential encoded data to the signal phases;
• and
• a transmission signal generation/output unit which generates/outputs a differential phase modulated signal based on the transmission signal phase,
• said receiver having,
• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a ρ-multiplying unit which multiplies the power by ρ;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the ρ-multiplied value of the power;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data.

A communication system comprising a transmitter for transmitting a data and a receiver for receiving the data, wherein

• said transmitter having,
• a convolutional coding unit which convolutional encodes the transmitted data;
• a first interleaving unit which interleaves an order of the convolutional-coded data according to a predetermined algorithm;
• a converting unit which converts the interleaved data into a transmission differential phase;
• a differential coding unit which differential encodes the transmission differential phase and maps the differential encoded data to the signal phases;
• and
• a transmission signal generation/output unit which generates/outputs a differential phase modulated signal based on the transmission signal phase,
• said receiver having,
• a multiple differential phase detected signal output unit which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an integer greater than 2) symbols before so as to output the calculated results as 1, 2, . . . , N symbol differential phase detected signals;
• a power detection unit which detects power of the received signal;
• a ρ-multiplying unit which multiplies the power by ρ;
• a soft decision demodulated data estimating unit which estimates transmitted differential phase sequence according to the 1, 2, . . . , N symbol differential phase detected signals using a trellis diagram representing transitions of differential phase states of transmitted signals and Viterbi algorithm, and estimates soft decision demodulated data according to the estimated transmitted differential phase sequence, survival path metric that transit into each state on the trellis diagram and the ρ-multiplied value of the power;
• and
• a second interleaving unit which interleaves the soft decision demodulated data according to a predetermined algorithm;
• and
• a decoding unit which decodes the original transmitted data based on the soft decision demodulated data after the interleaving.