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Physical Channels

PBCH, PDSCH, PDCCH, PCFICH, PHICH and EPDCCH coding, modulation, indices, scrambling sequence

Physical channels correspond to sets of time-frequency resources used for transmission of particular transport channel data, control information, or indicator information. Each transport channel is mapped to a corresponding physical channel. The red outline contains LTE System Toolbox™ downlink functionality for physical channels, transport channels, and control information.

Physical ChannelDescription

PBCH — physical broadcast channel

The PBCH carries part of the system information required for terminals to access the network.

PDSCH — physical downlink shared channel

The PDSCH carries user data and paging information to the terminal.

PDCCH — physical downlink control channel

The PDCCH conveys control information, scheduling decisions for PDSCH reception, and for scheduling grants enabling transmission on the PUSCH.

PCFICH — physical control format indicator channel

The PCFICH provides terminals with information to decode the set of PDCCHs. There is only one PCFICH per component carrier.

PHICH — physical hybrid-ARQ indicator channel

The PHICH conveys the hybrid-ARQ acknowledgement indicating to the terminal whether or not to retransmission of a transport block is required.

EPDCCH — enhanced physical downlink control channel

The EPDCCH is intended to be used to improve spectral reuse of control channel resources. It supports CoMP, downlink MIMO, beamforming and frequency domain inter-cell interference coordination (ICIC).

Functions

ltePBCHPhysical broadcast channel
ltePBCHIndicesPBCH resource element indices
ltePBCHPRBSPBCH pseudorandom scrambling sequence
ltePBCHDecodePhysical broadcast channel decoding
ltePDSCHPhysical downlink shared channel
ltePDSCHIndicesPhysical downlink shared channel (PDSCH) resource element indices
lteDMRSUE-specific demodulation reference signals
lteDMRSIndicesUE-specific DM-RS resource element indices
ltePDSCHPRBSPDSCH pseudorandom scrambling sequence
ltePDSCHDecodePhysical downlink shared channel decoding
ltePDCCHPhysical downlink control channel
ltePDCCHIndicesPDCCH resource element indices
ltePDCCHPRBSPDCCH pseudorandom scrambling sequence
ltePDCCHInterleavePDCCH interleaving and cyclic shift
ltePDCCHDeinterleavePDCCH deinterleaving and cyclic shifting
ltePDCCHSearchPDCCH downlink control information search
ltePDCCHSpacePDCCH search space candidates
ltePDCCHInfoPDCCH resource information
ltePDCCHDecodePhysical downlink control channel decoding
ltePCFICHPhysical control format indicator channel
ltePCFICHIndicesPCFICH resource element indices
ltePCFICHPRBSPCFICH pseudorandom scrambling sequence
ltePCFICHInfoPCFICH resource information
ltePCFICHDecodePhysical control format indicator channel decoding
ltePHICHPhysical hybrid ARQ indicator channel
ltePHICHIndicesPHICH resource element indices
ltePHICHInfoPHICH resource information
ltePHICHPRBSPHICH pseudorandom scrambling sequence
ltePHICHPrecodePHICH precoding
ltePHICHDeprecodePHICH deprecoding
ltePHICHTransmitDiversityDecodePHICH OSFBC decoding
ltePHICHDecodePhysical hybrid ARQ indicator channel decoding
lteEPDCCHEnhanced physical downlink control channel
lteEPDCCHIndicesEnhanced physical downlink control channel (EPDCCH) resource element indices
lteEPDCCHDMRSEPDCCH demodulation reference signals
lteEPDCCHDMRSIndicesEPDCCH DM-RS resource element indices
lteEPDCCHPRBSEPDCCH pseudorandom scrambling sequence
lteEPDCCHSearchEnhanced downlink control information search
lteEPDCCHSpaceEPDCCH search space candidates
lteEPDCCHDecodeEnhanced physical downlink control channel (EPDCCH) decoding

Topics

Resource Element Group

Resource Element Groups (REGs)

Introduces resource element groups (REGs) used for defining the mapping of control channels.

PBCH

PBCH Processing Functions

Block diagram view of the physical broadcast channel (PBCH) processing and associated functions in the LTE System Toolbox.

PDSCH

Downlink Shared Channel

Describes the processing of transport blocks (data) to create the downlink shared channel and the physical channel processing to create the physical downlink shared channel.

PDSCH Processing Functions

Block diagram view of the physical downlink shared channel (PDSCH) processing and associated functions in the LTE System Toolbox.

Model DL-SCH and PDSCH

This example shows how to construct the physical downlink shared channel (PDSCH).

PDCCH

Downlink Control Channel

Describes downlink control information (DCI) messages, DCI channel coding, and the physical channel processing to create the physical downlink control channel.

PDCCH Processing Functions

Block diagram view of the physical downlink control channel (PDCCH) processing and associated functions in the LTE System Toolbox.

Model DCI and PDCCH

This example shows how to model the control region used in an LTE downlink subframe and its channel structure.

PDCCH Blind Search and DCI Decoding

The example aids understanding of the control region used in an LTE downlink subframe and its channel structure by showing how a Downlink Control Information (DCI) message is generated and transmitted over a Physical Downlink Control Channel (PDCCH) and recovered by performing blind decoding using the LTE System Toolbox™.

PCFICH

Control Format Indicator (CFI) Channel

Describes the control format indicator (CFI) .

PCFICH Processing Functions

Block diagram view of the physical control format indicator channel (PCFICH) processing and associated functions in the LTE System Toolbox.

Model CFI and PCFICH

This example shows how to generate a PCFICH with the LTE System Toolbox™.

PHICH

HARQ Indicator (HI) Channel

Describes the hybrid automatic repeat request (HARQ) scheme for error correction, the HARQ Indicator (HI), and the physical channel processing to create the physical HARQ indicator channel.

PHICH Processing Functions

Block diagram view of the physical HARQ indicator channel (PHICH) processing and associated functions in the LTE System Toolbox.

Model HARQ Indicator and PHICH

This example shows how to implement the HARQ Indicator (HI) and physical HI channel (PHICH).

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