1. Spectral Efficiency of M-Ary/Spread Spectrum Multiple Access Communication Systems.
- Author
-
Tachikawa, Shin-ichi and Marubayashi, Gen
- Subjects
- *
CODE division multiple access , *SPREAD spectrum communications , *REED-Solomon codes , *DIGITAL signal processing -- Mathematics , *ERROR-correcting codes , *DIGITAL communications - 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. [ABSTRACT FROM AUTHOR]
- Published
- 1991
- Full Text
- View/download PDF