空間電力合成を用いた重畳型16QAM通信システムの伝送特性  [in Japanese] Transmission Performance of Space Power Combined Superposed 16QAM Communication System  [in Japanese]

In the progress of advancing information technology and public demand for fast, low cost and ubiquitous access to multimedia information, economical system design and higher capacity, higher data rate transmission over a band-limited channel are major concerns for wireless system construction. This paper presents a new communication system that can provide efficient use of the frequency resource and the transmitted power. The system incorporates a 16QAM modulation scheme and a phased array power combining technology. It also presents the effects of forward error correction coding (FEC) on nonlinear transmission channel and the theoretical studies on the signal transmission characteristics of the proposed system and the investigation results compared with the conventional systems. It was found from this study that the new superposed 16QAM system shows better performance than that of the conventional system on the nonlinear transmission channel usually observed in such a power amplifier. This unique configuration enables the reliable transmission of higher data rates with the efficient use of the power and the bandwidth.