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Terrestrial communication experiments over various regions of Indian subcontinent and tuning of Hata’s model

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Abstract

The development of various radio planning tools for the design of fixed and mobile communication systems requires radio channel measurements, comparison with various models, and the tuning of various parameters involved in the model. Based on the various land- and rail-based VHF/UHF measurements over northern, southern, western, and eastern parts of Indian subcontinent, the parameters of Okumura–Hata model are tuned, and modified parameters for the above regions have been deduced. These can be utilized for the design and development of future broadcast systems, mobile communication systems in this region of the world.

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Author information

Authors and Affiliations

  1. Radio & Atmospheric Sciences Division, National Physical Laboratory (NPL), New Delhi, 110012, India

    M. V. S. N. Prasad & K. Ratnamala

  2. Department of computer science and electrical engineering, 546 Flarsheim Hall, University of Missouri-Kansas City, 5100 Rockhill Road, Kansas City, MO, 64110, USA

    M. Chaitanya

  3. C-DOT, Mandigaon road, opp. New Manglapuri, Chatterpur, Mehrauli, New Delhi, 110030, India

    P. K. Dalela

Authors
  1. M. V. S. N. Prasad
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  2. K. Ratnamala
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  3. M. Chaitanya
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  4. P. K. Dalela
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Corresponding author

Correspondence to M. V. S. N. Prasad.

Appendices

Annexure A

The detailed specifications of receiver RFT SMV-8 are given below.

  1. 1.

    The frequency is subdivided into five ranges: 30–66 MHz, 66–142 MHz, 142–300 MHz, 300–600 MHz, 600–1,000 MHz.

    Error of the frequency scale after calibration onto the next frequency marker, ±3 × 10−3 f input + 200 kHz

  2. 2.

    Error with the measurement of voltage ratios.

    Error of the voltage divider within the frequency range 30–300 MHz, ±0.6 dB; 300–1,000 MHz, ±0.9 dB.

  3. 3.

    Input impedance = 50 Ω, RF instrument connector series N

  4. 4.

    Selectivity properties

    1. 4.1.

      Bandwidths 120, 20, 1 KHz (for sweep operation, the additional error of the voltage measurement is ±0.5 dB)

    2. 4.2.

      IF selectivity

      Table 4
      Full size table
    3. 4.3.

      Image frequency rejection with in the frequency range 30–300 MHz, >80 dB; 300 MHz–1,000 MHz, >60 dB Amplitude and frequency demodulation facility available

  5. 5.

    Receiver sensitivity

    12 dB or better for a level of −107 dBm (1 μV). Signal to noise ratio of 50 dB or better for RF level of −87 dBm of 10 μV at antenna port

  6. 6.

    Environmental conditions

    Operational conditions class according to GDR standard, TGL 9200 B1.1, TII.

    Extended ambient temperature range −30°C to +50°C. Instrument meets the environmental testing requirement according to USSR standard GOST 9763-67, group of instruments IV.

    Transmitter was operating on amplitude modulation radiating output power of 5 W with a omnidirectional monopole antenna. Receiving antenna is a yagi with gain of 12 dBi.

Annexure B

Table 4 Details of paths and specifications of experimental measurements
Full size table
Table 5 Mean errors (ME) and standard deviations (SD) of Hata’s prediction method (in dB)
Full size table

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Prasad, M.V.S.N., Ratnamala, K., Chaitanya, M. et al. Terrestrial communication experiments over various regions of Indian subcontinent and tuning of Hata’s model. Ann. Telecommun. 63, 223–235 (2008). https://doi.org/10.1007/s12243-008-0022-9

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  • DOI: https://doi.org/10.1007/s12243-008-0022-9

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