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首页> 外文会议>Ionospheric Radio Systems and Techniques (IRST 2012), 12th IET International Conference on >Spectral occupancy of fixed and mobile allocations within the high frequency band
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Spectral occupancy of fixed and mobile allocations within the high frequency band

机译：高频段内固定和移动划分的频谱占用

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摘要

Power levels in the High Frequency (HF) band from 3 to 30 MHz were measured to determine channel occupancy statistics including patterns in time and frequency. Congestion in Canadian spectrum allocations for fixed and mobile users and patterns in the ambient radio noise power across the HF band were examined. A receiver site was set up in Ottawa, Canada using a spectrum analyzer and an omni-directional, horizontally polarized antenna having an elevation pattern optimized for reception of signals arriving via sky wave propagation. Diurnal and random fluctuations in channel occupancy, congestion, and noise measurements were observed and sample data plots for fixed and mobile allocations were presented and discussed. The availability of unoccupied channels in bandwidth increments of 3, 12, and 24 kHz for each 1 MHz frequency range is discussed and may be used to inform future assignments for fixed and land mobile services in the Canadian Table of Frequency Allocations. Hourly variations in channel occupancy show that there are ample spans of contiguous unoccupied spectrum to support channel bandwidths up to 24 kHz during most hours of the day; however, during the most congested times, even 3 kHz contiguous channels are not available in the frequency ranges that are optimal for propagation. These results suggest that spectrum availability in the region can support the use of wideband HF modems; however, the optimal modulation bandwidth will vary according to the time of day and the number of channels required.
机译：测量了3至30 MHz的高频（HF）频带中的功率电平，以确定信道占用统计信息，包括时间和频率的模式。检查了加拿大固定和移动用户频谱分配的拥塞情况以及整个HF频段的环境无线电噪声功率的模式。使用频谱分析仪和全向，水平极化天线在加拿大渥太华建立了一个接收站，该天线具有经过优化的仰角模式，可以接收通过天波传播到达的信号。观察到信道占用率，拥塞和噪声测量值的日变化和随机变化，并给出并讨论了固定和移动分配的样本数据图。对每个1 MHz频率范围的带宽增量分别为3、12和24 kHz的空闲信道的可用性进行了讨论，并可用于通知加拿大频率分配表中固定和陆地移动业务的未来分配。信道占用率的每小时变化表明，在一天的大部分时间中，有足够大的连续未占用频谱跨度来支持高达24 kHz的信道带宽；但是，在最拥挤的时间内，即使在最适合传播的频率范围内，甚至3 kHz的连续信道也不可用。这些结果表明，该地区的频谱可用性可以支持宽带HF调制解调器的使用。但是，最佳调制带宽将根据一天中的时间和所需的信道数而变化。

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