Resource Interface (Custom OFDM)
: Type1
determines the set of API 1) Access Preamble Indicator, or 2) Application Programming Interface properties used to describe the OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. signal to be analyzed. This includes the mapping of frame part allocations to the available OFDM Resource Units (RU RU is an abbreviation for Resource Unit, where one resource unit is a single subcarrier at a single symbol time. The value displayed is the total number of resource units occupied by subcarriers of the specified Resource Type.) plus describing each individual frame part allocation's associated configuration properties.
- Resource Map Interface Type1 is used.
The legacy Type1 resource interface selection supports loading and running of VSA Custom OFDM measurement legacy setup configurations created prior to VSA2025 (version 29.00).
Please note, use of the newer Frame Definition API properties are strongly recommended when creating any new Custom OFDM measurement setup configurations for improved usability.
Upon selecting Frame Definition Apply, any new Custom OFDM measurement setup configurations will be applied using the new Resource Interface Type2 associated set of API properties.
Summary of legacy Type1 resource interface associated set of API properties
The following Resource Map and Resource Modulations array properties each contain a single set of per RU (Resource Unit) values, comprising one value for each RU element within the defined resource mappings.
The above single set of per RU values is applied to ALL of any given User ID’s associated SISO/MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. mapped Active Ports (0-7). Each per RU value is an integer bitmap comprising 4 field values: User ID (8bit) / Multi (1bit) / Ant (3bit) / Type (3bit). The User ID field value can then be used to index into the following per User array properties to configure associated information for each user.
- Resource Map Interface Type2 is used.
Please note, use of the newer Frame Definition API properties are strongly recommended when creating any new Custom OFDM measurement setup configurations for improved usability.
Upon selecting Frame Definition Apply, any new Custom OFDM measurement setup configurations will be applied using the new Resource Interface Type2 associated set of API properties.
Summary of newer Type2 resource interface associated set of API properties
The following Resource Allocations array property contains 'N' sequential sets of per RU (Resource Unit) values, where each individual set comprises one value for each RU element within the defined resource mappings. The number of sequential sets 'N' should equal the Frame Definition configured Transmitter Antennas value. For example if Transmitter Antennas = 2, then the Resource Allocations array property should contain 2 sequential sets of per RU values. The first set of per RU values would represent the Active Port(0) resource allocation mappings, and the second set of per RU values would represent the Active Port(1) resource allocation mappings.
Each set of per RU values is applied successively to each of a given Allocation ID's associated SISO/MIMO demodulation Active Ports(0-7). Each per RU value, for each per Active Port set, is an integer value representing the mapped Allocation ID. If no valid Allocation ID is mapped to a specific RU, then the corresponding per RU value should be set to -1 value instead. The Allocation ID value can then be used to index into the following per Allocation array properties to configure associated information for each allocation.
The Frame Part ID value for each allocation, can then be used to index into the following per Frame Part array properties to configure associated information for each frame part.
See Also
