Ray,
Sorry for the delay in response.
> My point about being able to represent discontinuities in the frequency
> range still appears to stand, however.
>
I see. Television channels do not occupy a contiguous range of frequencies.
In the US,
- [54MHz, 72MHz] Channel 2-4
- [76MHz, 88MHz] Channels 5-6
- [174MHz, 216MHz] Channels 7-13
- [470MHz, 698MHz] Channels 14-51
So the response given by the database should not include any frequencies
not in the plan.
That means a "spectrum profile" should be encoded as a list of "array" of
(frequency, power) points.
- Each array represents a "profile" for a contiguous range of frequencies
- The range of frequencies within a list of profiles MUST be disjoint and
SHOULD be sorted
- The entire set of frequency bands defined by the regulatory domain MUST
be represented by a single list of "profiles"
(rather than split them across multiple lists)
That last point is to remove ambiguity and, thus, variations in database
implementation, to simplify logic on devices.
Example:
"spectra": [
{
"bandwidth": 6e6,
"profiles": [
[
{ "freqHz": 5.4e7, "maxPsdDbmPerBw": -56.8 },
{ "freqHz": 7.2e7, "maxPsdDbmPerBw": -56.8 },
],
[
{ "freqHz": 7.6e7, "maxPsdDbmPerBw": -56.8 },
{ "freqHz": 8.8e7, "maxPsdDbmPerBw": -56.8 },
],
[
{ "freqHz": 1.74e8, "maxPsdDbmPerBw": -56.8 },
{ "freqHz": 2.16e8, "maxPsdDbmPerBw": -56.8 },
],
[
{ "freqHz": 4.70e8, "maxPsdDbmPerBw": -56.8 },
{ "freqHz": 5.18e8, "maxPsdDbmPerBw": -56.8 },
{ "freqHz": 5.18e8, "maxPsdDbmPerBw": 30.0 },
{ "freqHz": 5.24e8, "maxPsdDbmPerBw": 30.0 },
{ "freqHz": 5.24e8, "maxPsdDbmPerBw": 36.0 },
{ "freqHz": 5.30e8, "maxPsdDbmPerBw": 36.0 },
{ "freqHz": 5.30e8, "maxPsdDbmPerBw": -56.8 },
{ "freqHz": 6.98e8, "maxPsdDbmPerBw": -56.8 }
]
]
},
{
"bandwidth": 1e5,
"profiles": [
[
{ "freqHz": 5.4e7, "maxPsdDbmPerBw": -74.58 },
{ "freqHz": 7.2e7, "maxPsdDbmPerBw": -74.58 },
],
[
{ "freqHz": 7.6e7, "maxPsdDbmPerBw": -74.58 },
{ "freqHz": 8.8e7, "maxPsdDbmPerBw": -74.58 },
],
[
{ "freqHz": 1.74e8, "maxPsdDbmPerBw": -74.58 },
{ "freqHz": 2.16e8, "maxPsdDbmPerBw": -74.58 },
],
[
{ "freqHz": 4.70e8, "maxPsdDbmPerBw": -74.58 },
{ "freqHz": 5.18e8, "maxPsdDbmPerBw": -74.58},
{ "freqHz": 5.18e8, "maxPsdDbmPerBw": 27.0 },
{ "freqHz": 5.24e8, "maxPsdDbmPerBw": 27.0 },
{ "freqHz": 5.24e8, "maxPsdDbmPerBw": 33.0 },
{ "freqHz": 5.30e8, "maxPsdDbmPerBw": 33.0 },
{ "freqHz": 5.30e8, "maxPsdDbmPerBw": -74.58 },
{ "freqHz": 6.98e8, "maxPsdDbmPerBw": -74.58 }
]
]
}
]
Does that address your concern?
--
-vince
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