修正エルミート波形を用いた多値化UWB-CDMA伝送方式の一検討(UWBシステム/一般)  [in Japanese] A Study on Multivalued Transmission System for UWB-CDMA Using Modified Hermite Pulse Shape  [in Japanese]

超広帯域を占有するUWB無線通信方式が注目を集めている中,国内外で様々な研究が行われている.その中で,UWB通信に用いる波形として,MHP (Modified Hermite Polynomials)に基づく直交波形がすでに提案されている.本研究ではこの波形とTH (Time Hopping)方式,多値伝送方式を組み合わせた方式を考え,従来方式と比較して伝送速度を落とすことなくビット誤り率(BER)を低減できるような方式を2通り考える.この2つの提案方式について計算機シミュレーションを行い,提案方式同士のE_b/N_0に対するBERの比較,従来方式とのE_b/N_0に対するBERの比較により,提案方式の有効性を確認する.

A lot of attention has been paid to ultra Wideband wireless communication due to its potential to reach data rate in wireless communication. In UWB works, UWB pulses based on Modified Hermite Polynomials (MHP) have been proposed before. These pulses are orthogonal. In this work, there are two proposed systems and proposed systems include MHP pulses, TH and multivalued transmission system. These proposed systems can reduce the BER under E_b/N_0, compared to conventional systems. Curves of BER versus E_b/N_0 are obtaind through computer simulations are provided. It is shown that proposed systems can overperform conventional systems.