US 8,942,078 B2 · Digital data transmitting device and digital data receiving device

Abstract

To provide a digital data transmitting apparatus and a digital data receiving apparatus that can realize, even when a transmission channel characteristic changes because of aged deterioration or the like of a relay, improvement of a reception performance following the change. A transmitting apparatus 1 generates a multiplexing frame formed by N slots including control information, data, outer parities, stuff bits, and inner parities and added with synchronization, pilot, and a transmission control signal and a parity and transmits data of the respective slots in a transmission system designated by the transmission control signal. In this case, pilot signals are symbols allocated to all signal points in order determined in advance for each of modulation schemes. A receiving apparatus 2 rewrites a phase error table 214 to calculate a phase error and performs synchronous detection according to the pilot signals. The receiving apparatus 2 also rewrites a likelihood table 235 to perform inner code decoding. Consequently, since reception processing adapted to distortion of a transmission channel characteristic can be performed, improvement of a reception performance can be realized.

Claims14

Dependent claims

A receiving apparatus used for a system that transmits data according to a digital modulation scheme for shifting amplitude and phase, the receiving apparatus comprising:

orthogonal detecting means for applying orthogonal detection to a reception signal;
and
pilot-signal extracting means for extracting, concerning symbols of pilot signals periodically time-division multiplexed on the reception signal in predefined order, signal points modulated by the symbols,
wherein the receiving apparatus
orthogonally detects, with the orthogonal detecting means, a signal obtained by periodically time-division multiplexing transmission data and symbols of predefined pilot signals different from the transmission data,
detects, with the pilot-signal extracting means, signal point position information corresponding to the symbols of the predefined pilot signals, and
performs reception of the transmission data on the basis of the signal point position information.

4 more elements

A receiving apparatus used for a system that transmits data according to a digital modulation scheme for shifting amplitude and phase, the receiving apparatus comprising:

orthogonal detecting means for applying orthogonal detection to a reception signal;
pilot-signal extracting means for extracting, concerning symbols of pilot signals in which at least one of signal points on respective concentric circles of symbols allocated to respective signal points of the modulation scheme is periodically time-division multiplexed on the reception signal in predefined order, signal points modulated by the symbols;
and
signal-point-position estimating means for estimating, from symbols transmitted as the pilot signals, signal points of symbols not transmitted as the pilot signals,
wherein the receiving apparatus
orthogonally detects, with the orthogonal detecting means, a signal obtained by periodically time-division multiplexing transmission data and symbols of predefined pilot signals different from the transmission data,
detects, with the pilot-signal extracting means, signal point position information corresponding to the symbols of the predefined pilot signals,
acquires, with the signal-point-position estimating means, signal point position information of the symbols not transmitted as the pilot signals from the signal point position information, and
performs reception of the transmission data on the basis of the signal point position information.

6 more elements

Dependencies are inferred from the claim text.

Digital data transmitting device and digital data receiving device

Life of this patent

Digital data transmitting device and digital data receiving device

Life of this patent

Abstract

Claims14