OFDM Serializer

Serializes complex modulations symbols from OFDM sub-carriers.

This is the inverse block to the OFDM Carrier Allocator. It outputs the complex data symbols as a tagged stream, discarding the pilot symbols.

If given, two different tags are parsed: The first key () specifies the number of OFDM symbols in the frame at the input. The second key () specifies the number of complex symbols that are coded into this frame. If given, this second key is then used at the output, otherwise, is used. If both are given, the packet length specifies the maximum number of output items, and the frame length specifies the exact number of consumed input items.

It is possible to correct a carrier offset in this function by passing another tag with said offset.

Input

Complex vectors of length

Output

Complex scalars, in the same order as specified in occupied_carriers.

Parameters

FFT length

FFT length

Occupied Carriers

See OFDM Carrier Allocator

Length Tag Key

The key of the tag identifying the length of the input frame in OFDM symbols.

Packet Length Tag Key

The key of the tag identifying the number of complex symbols in this packet.

Symbols skipped

If the first symbol is not allocated as in occupied_carriers[0], set this

Carrier Offset Key

When this block should correct a carrier offset, specify the tag key of the offset here (not necessary if following an ofdm_frame_equalizer_vcvc)

Input is shifted

If the input has the DC carrier on index 0 (i.e. it is not FFT shifted), set this to false

Example Flowgraph

Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.

Source Files

C++ files

[1]

Header files

[2]

Public header files

[3]

Block definition

[4]