Spectral efficiency of M‐ary/spread spectrum multiple access communication systems
Shin’ichi Tachikawa, Gen Marubayashi · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 1991
Abstract In this paper, M‐ary/spread spectrum multiple access communication systems (SSMA) are studied to improve spectral efficiency. A novel method of calculation of the spectral efficiency for several tip waveforms and bit error rate is shown. For M‐ary/ SSMA using orthogonal codes, the spectral efficiency can be improved considerably, however, the code length is becoming too long to achieve satisfactory spectral efficiency. To shorten the code length for the same spectral efficiency, M‐ary/SSMA is adopted using concatenated Reed‐Solomon codes, and the effectiveness is shown.