Open AccessConstant-Amplitude Multi-Code Trans-Orthogonal Modulation
Author(s) -
Dae-Ki Hong
Publication year - 2011
Publication title -
journal of the korea academia-industrial cooperation society
Language(s) - English
Resource type - Journals
eISSN - 2288-4688
pISSN - 1975-4701
DOI - 10.5762/kais.2011.12.1.493
Subject(s) - pulse density modulation , pulse amplitude modulation , amplitude modulation , analog transmission , modulation (music) , delta modulation , quadrature amplitude modulation , amplitude , amplifier , bandwidth (computing) , computer science , electronic engineering , frequency modulation , physics , telecommunications , optics , channel (broadcasting) , acoustics , analog signal , engineering , bit error rate , detector , pulse (music) , transmission (telecommunications)
To improve the bandwidth efficiency of conventional orthogonal modulation, the MCTO(Multi-Code Trans-Orthogonal) modulation, which is modified orthogonal modulation, was proposed. However, the RF(Radio Frequency) power amplifier for the MCTO modulation is too complex to reject the amplitude distortion due to the non-constant amplitude property of the MCTO. Therefore, in this paper, CAMCTO(constant-amplitude multi-code trans-orthogonal) modulation is proposed by using the constant-amplitude encoding algorithm for multi-code signal. Additionally, the performance of the proposed CAMCTO modulation is compared with those of the orthogonal modulation and the MCTO modulation by using the computer simulation. The computer simulations show that the bandwidth efficiency of the proposed CAMCTO modulation is better than that of the conventional orthogonal modulation.
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