Physical Sidelink Broadcast Channel (PSBCH)

This module implements the physical sidelink broadcast channel. The implementation of these modules is based on [3GPPTS38211psbch].

PSBCH Transmitter

class toolkit5G.PhysicalChannels.PSBCH(E, cellID)

Physical Sidelink Broadcast Channel (SS/PBCH) Blocks are used during the cell search procedure, i.e. UE search for Synchronisation Signals when scanning for a cell to camp on

Parameters:

• E (int) – Number of Target Bits expected at the end of rate matching.

• cellID (int) – Defines the cell-ID \(\in \{0, 1, \dots, 1007\}\).

Note

The value of E is 1386 when number of Symbols allocated for SSB is 11 and E = 1782 when the number of symbols allocated for SSB is 13

Input:

• inputBits (np.ndarray) – SL SSB payload bits It must be a 2-dimensional array

• verbose (bool) – Flag to indicate whether verbal explanation of PSBCH transmitter is required

Output:

[inputBits.shape[0],E/2]: np.ndarray – Array containing the SSB payload

Attributes:

• crcEncoder (object)

• bitInterleaver (object)

• subBlockInterleaver (object)

• channelInterleaver (object)

• scrambler (object)

• mapper (object)

PSBCH Receiver

class toolkit5G.PhysicalChannels.PSBCHDecoder(K, cellID, symbolDemapper)

Parameters:

• K (int) – Defines the size of SL-SSB in terms of bits.

• cellID (int) – Defines the cell-ID \(\in \{0, 1, \dots, 1007\}\).

• symbolDemapper (str) – Defines the technique used for symbol demapping can take either “app” or “maxlog”

Input:

• inputSymbols (np.ndarray) – It is a numpy array of size [:,(E/2] it denoted the received SL-SSB that is to be decoded

• snr (int or float or np.number) – Defines the Signal to Noise Ratio in linear scale

• polarDecoder (str) – Defines the decoding technique. It is expected to possess one string among the following `{“SC”, “SCL”, “SCL8”, “SCL32”, “hybSCL”, “BP”}.

Output:

[ (,K]: np.array) – The decoded SL-SSB bits

Attributes:

• demapper (object)

• descrambler (object)

• channelDeInterleaver (object)

• subBlockDeInterleaver (object)

• inputDeInterleaver (object)

• crcDecoder (object)

PSBCH Components

• Cyclic Redundency Check
  • Cyclic Redundancy Check
• RNTI Masking
  • RNTI Masking
    • RNTImasking
      • RNTImasking.rnti
• Input Bit Interleaver
  • Code-block Processing: Transmitter
    • Code-block Segmentation
      • CodeBlockSegmentation
    • Code-block Concatenation
      • CodeBlockConcatenation
  • Code-block Processing: Receiver
    • Code-block Segregation
      • CodeBlockSegregation
    • Code-block Aggregation
      • CodeBlockAggregation
  • Input Bit Interleavers
    • Input Bit Interleaver
      • InputBitInterleaver
    • Input Bit Deinterleaver
      • InputBitDeInterleaver
• Polar Coder
  • Polar Codes
    • Polar Encoder
      • PolarEncoder5G
        • PolarEncoder5G.N
    • Polar Decoder
      • PolarDecoder5G
        • PolarDecoder5G.E
        • PolarDecoder5G.K
        • PolarDecoder5G.N
        • PolarDecoder5G.dec_type
        • PolarDecoder5G.llr_max
        • PolarDecoder5G.output_dtype
    • Polar Codec Components
• Rate Matching
  • Sub Block Interleaver
    • Sub Block Interleaver for Polar Coder
      • Sub-block Interleaver
        • Subblock_Interleaver
      • Sub-block De-interleaver
        • Subblock_DeInterleaver
  • Bit Selection
    • Bit Selection for Polar Coder
      • Bit Selection
        • BitSelection
      • Bit De-selection
        • BitDeSelection
  • Channel Interleaver
    • Channel Interleaver for Polar Coder
      • Channel Interleaver
        • ChannelInterleaver
      • Channel De-interleaver
        • ChannelDeInterleaver
• Scrambling: PDCCH
  • Scrambling
  • Scrambler
    • Scrambler
      • Scrambler.Lmax
      • Scrambler.c_init
      • Scrambler.id
      • Scrambler.mu
      • Scrambler.nID
      • Scrambler.purpose
      • Scrambler.q
      • Scrambler.rnti
      • Scrambler.ssbIndex
  • Descrambler
    • DeScrambler
      • DeScrambler.Lmax
      • DeScrambler.c_init
      • DeScrambler.id
      • DeScrambler.mu
      • DeScrambler.nID
      • DeScrambler.purpose
      • DeScrambler.q
      • DeScrambler.rnti
      • DeScrambler.ssbIndex
• Modulation
  • Symbol Mapping
  • Mapper
    • Mapper
  • Demapper
    • Demapper

References:

[3GPPTS38211psbch]

(Section 8.3.3 of 3GPP TS 38.211 version 17.1.0 Release 17) 5G; NR; Physical channels and modulation