Abstract
Lately, there has been a particular interest in increasing the bandwidth of the ionospheric channel in the high frequency (HF) range. Tests on the use of bandwidths of up to 24kHz have shown that under certain conditions a substantial increase in the data transfer rate in the HF range could be achieved. But the bandwidth increase is limited mainly due to the noise level. This paper approaches a preliminary experimental analysis of the noise power levels in variable bandwidth ionospheric channels under Near Vertical Incidence Skywave (NVIS) operating conditions in the 3-9 MHz band. The results show that the mean noise power increases by an average of 3.5 dB at doubling the bandwidth of the ionospheric channel, while the dispersion of noise is maintained (at maximum 9.5 dB) regardless of the bandwidth of the ionospheric channel.
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