Application of Adaptive QAM Modulation and Diversity Scheme for 30 GHz Cellular Communications under the Impact of Rain Attention in Indonesia  

Oleh:

Hendrantoro, Gamantyo ; Mauludiyanto, Achmad ; Yundariani, Ninik Dwi

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: IPTEK: The Journal for Technology and Science vol. 18 no. 3 (Aug. 2007), page 82-88.
Topik: Adaptive Modulation; Diversity; LMDS; Rain Attenuation

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM48.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In milimeter-wave wireless cellualr systems like Local Multipoint Distribution Services (LMDS) rain attenuation is an essential factor of performance degradation. It can cause signal outstages and poor quality of signal reception. To mitigate the problem, a combination of diversity and adaptive modulation is proposed. To investigate the impact of using these techniques, a simulation is performed for a 30 GHz cellular system to obtain SNR (Signal-to-noise ratio), diversity gain, modulation level and BER (Bit Error Rate). Analysis of the implementation of the combined techniques is accomplished by taking into account such factors as lengths of links and the combining method. Simulation results show that diversity can improve the overall system SNR. Diversity gain of up to 15 dB can be achieved on two 4-km converging links at 0.01% outage probability when maximal ratio combining (MRC) is used. For systems with luxurious link design for which the clearsky SNR is more than 30 dB, as considered in this paper, diversity and adaptive modulation do not significantly contribute to improvement of achievable transmission rate and BER performance. However, for systems with lower values of clearsky SNR, use of both techniques will be more worthwhil.

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