Current standard: IEEE 1278.1
Modulation Type Record
Size: 64
Description: Information about the type of modulation used for radio transmission shall be represented by a Modulation Type Record. This record uniquely identifies the various sets of signal parameters (i.e. the modulation type) that are used to determine whether two radios may interoperate. The modulation is characterized in a generic fashion by the spread spectrum, major modulation type, and detail fields. The classes of interoperable modulation types are enumerated by the System field. This record shall specify the spread-spectrum usage, major modulation type, detailed information, and system compatibility. The fields for this record are described in the paragraphs that follow.
a) Spread Spectrum - This field shall indicate the spread spectrum technique or combination of spread spectrum techniques in use. The Spread Spectrum field shall consist of a 16 element boolean array. Each independent type of spread spectrum technique shall be represented by a single element of this array. If a particular spread spectrum technique is in use, the corresponding array element shall be set to one, otherwise it shall be set to zero. All unused array elements shall be set to zero. The supported spread spectrum techniques and their assignment to elements of the 16 element array are defined in Section 9 of EBV-DOC and illustrated in Table 23:
Table 23 --- Spread spectrum field definition
Bits 3-15 Bit 2 Bit 1 Bit 0
TBD Time Hop Pseudo Noise Frequency Hop
b) Major Modulation Type - This field shall specify the major classification of the modulation type. This field shall be represented by a 16-bit enumeration (see Section 9 in EBV-DOC).
c) Detail - This field shall provide certain detailed information depending upon the Major Modulation Type. This field shall be represented by a 16-bit enumeration (see Section 9 in EBV-DOC).
d) System - This field shall specify the interpretation of the modulation parameter field(s) in the Transmitter PDU. This field shall be represented by a 16-bit enumeration (see Section 9 in EBV-DOC).
The Modulation Type record is represented on Table 24.
Record Components:
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