12 GHz fixed links — English source excerpts

Selected translation, not a translation of the entire PDF. Frequencies in the channel tables are converted from the source's GHz to MHz.

Source: MIC, 電波法関係審査基準の一部を改正する訓令案新旧対照条文 (Draft instruction amending the Radio Act examination standards: comparison with the preceding text), 別紙2 — 目的別審査基準, published with the 30 September 2010 consultation. Japanese PDF.

The translated proposed text is 別紙2-7, PDF pp. 183–184 and 194 (its own printed pp. 1–2 and 12). The preceding text, 別紙2-8, repeats the 10/20 MHz centre lists on PDF p. 211 / printed p. 13. The new 30 MHz arrangement accompanies the introduction of 128QAM156M. MIC's 26 November 2010 consultation outcome confirms that introduction; ARIB NEWS 786, PDF p. 3 records operation under the revised standards from 1 April 2011.

Basic conditions and assigned parameters

Translation of §ア(ア)–(イ), ア(エ), イ(ア) and イ(エ), PDF p. 183 / printed p. 1:

  • These examination standards apply to 12 GHz fixed stations using equipment conforming to Article 58-2-9 of the Radio Equipment Regulations. Other special provisions, where present, also apply.
  • The communication arrangement is one-to-one, using digital duplex communication with symmetrical transmission and reception.
  • When assigning frequencies, account must be taken of sharing with frequencies used for programme relays for satellite auxiliary broadcasting in the 12 GHz band.
  • The assigned frequency is selected from the requested range using Appendix (5)-3, as a frequency paired with that of the correspondent station. In principle, one regenerative section uses the same frequency band throughout.
  • The permitted occupied bandwidth is one of 2.5, 5, 9.5, 19 or 28.5 MHz.

Appendix (5)-3 explicitly permits the three unpaired channels shown below for one-way communication only.

Table 1: transmission systems

PDF p. 183 / printed p. 1. Shared cells are repeated for clarity.

Modulation Emission Capacity, Mbps Frequency spacing, MHz Standard clock, MHz Permitted occupied BW, MHz
4PSK G7W 3 10 1.8 2.5
4PSK G7W 6 10 4.5 5
4PSK G7W 13 10 9 9.5
16QAM D7W 26 10 9 9.5
128QAM D7W 52 10 9 9.5
128QAM D7W 104 20 18 19
128QAM D7W 156 30 26 28.5

For the 128QAM rows, co-channel operation using both vertical and horizontal polarization can double the transmission capacity.

Table 2: modulation, occupied bandwidth and standard transmission rate

PDF p. 184 / printed p. 2. Modulation switching uses the same permitted occupied bandwidth. Rates below are Mbps; a dash is a blank combination in the source.

Occupied BW, MHz 4PSK 16QAM 32QAM 64QAM 128QAM
5 6 13 — — —
9.5 13 26 32 39 52
19 26 52 64 78 104
28.5 39 78 104 117 156

Appendix (5)-3: frequency arrangement

PDF p. 194 / printed p. 12. This is the complete table. The duplex separation of every paired row is 120 MHz.

(1) Small- and medium-capacity systems: 3, 6, 13, 26 and 52 Mbps

The associated permitted occupied bandwidths from Table 1 are 2.5, 5 and 9.5 MHz, all sharing this 10 MHz centre spacing.

Channel Low group, MHz High group, MHz
31 12205 12325
32 12215 12335
33 12225 12345
34 12235 12355
35 12245 12365
36 12255 12375
37 12265 12385
38 12275 12395
39 12285 12405
40 12295 12415
41 12305 12425
42 12315 12435

Source note: includes 104 Mbps using co-channel operation.

(2) Large-capacity system: 104 Mbps

Associated permitted occupied bandwidth: 19 MHz; centre spacing: 20 MHz.

Channel Low group, MHz High group, MHz
1 12210 12330
2 12230 12350
3 12250 12370
4 12270 12390
5 12290 12410
6 12310 12430
7 — 12450
8 — 12470
9 — 12490

Source notes: includes 208 Mbps using co-channel operation. Channels 7–9 are for one-way communication only.

(3) Large-capacity system: 156 Mbps

Associated permitted occupied bandwidth: 28.5 MHz; centre spacing: 30 MHz.

Channel Low group, MHz High group, MHz
61 12215 12335
62 12245 12365
63 12275 12395
64 12305 12425

Source note: includes 312 Mbps using co-channel operation.