| Autor: |
F. Vejrazka, G. Kandus, T. Javornik |
| Jazyk: |
angličtina |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
Radioengineering, Vol 9, Iss 4, Pp 8-14 (2000) |
| Druh dokumentu: |
article |
| ISSN: |
1210-2512 |
| Popis: |
Four modulation schemes, namely minimum shift keying (MSK), Gaussianminimum shift keying (GMSK), multiamplitude minimum shift keying(MAMSK) and À/4 differential quadrature phase shift keying (À/4-QPSK)are described and their applicability to wireless access is discussedin the paper. Low complexity receiver structures based on differentialdetection are analysed to estimate the performance of the modulationschemes in the additive Gaussian noise and the Rayleigh and Riceenvelope fast fading channel. The bandwidth efficiency is calculated toevaluate the modulation schemes. The results show that the MAMSK schemegives the greatest bandwidth efficiency, but its performance in theRayleigh channel is rather poor. In contrast, the MSK scheme is lessbandwidth efficient, but it is more resistant to Rayleigh fading. Theperformance of À/4-QPSK signal is considerably improved by appropriateprefiltering. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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