DAPSK-OFDM変調方式を用いた高速データ伝送の実験的検討(<論文小特集>デジタル放送を支える伝送技術)

概要

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Digital transmission signals are distorted by multi-path fading in a mobile radio channel. This is a severe problem, especially when a digital field pick-up unit transmits high-bit-rate data such as HDTV digital signals. The OFDM (orthogonal-frequency-division-multiplexing) modulation scheme mitigates the adverse effects of multi-path fading by distributing the transmission data into a large number of carriers with low-bit-rate modulation. To reduce the degradation due to multi-path fading in high-bit-rate transmission, we have developed an experimental OFDM modem that uses multi-mode modulation: 16/32DAPSK (differential amplitude phase shift keying). Transmission experiments showed that the a 16/32 DAPSK-OFDM modem can transmit data at 23.7 Mbps by 16 DAPSK modulation and at 29.7 Mbps by 32 DAPSK modulation within a bandwidth of 13.5 MHz in a frequency-selective Rayleight fading channel.
社団法人映像情報メディア学会の論文
1999-11-20