This is a brief Abstraction regarding Pilots/Reference Signals In LTE system.

1. LTE-REFERENCE SIGNALS
(PILOTS)
RS-REFERENCE SIGNALS
DL-RS:
CRS-Cell Specific Reference Signals
CSI -Channel State Information
MBSFN -Multicast/Broadcast Single Frequency Network
PRS-Positioning RS
UL-RS
Demodulation Reference Signals (DM-RS)
Sounding Reference Signal (SRS)
astro ©
github.com/astro7x
linkedin.com/in/mrastro

2. RS-REFERENCE SIGNALS
CRS
Cell-specific Reference Signal
and is used for EVM
Minimization and Equalizer
Training, and can be used for
synchronization.
used as the power level
reference for the rest of the
component carrier's channels.
CSI
Channel State Information
Reference Signal and is
used by the UE to estimate
the channel and report
channel quality information
(CQI) to the base station.
Multicast/Broadcast
Single Frequency Network
Reference Signal and is
used for equalization of
PMCH transmissions.
MBSFN
DMRS
(DMRS) in uplink
transmission is used
for channel estimation
and for coherent
demodulation
astro ©
github.com/astro7x
linkedin.com/in/mrastro

3. SYNCHRONIZATION SIGNALS
(PSS AND SSS)
used by the UE to obtain the cell identity and frame timing.
This arrangement creates 504 unique physical cell identities.
You can obtain by successfully demodulating the PSS. The SSS can
then be demodulated and combined with knowledge of to obtain
Once you establish the values you can determine the cell identity
PSS
SSS
astro ©
github.com/astro7x
linkedin.com/in/mrastro

4. MAPPING OF THE PSS
The PSS is mapped into the first 31 subcarriers either side of the DC
subcarrier. Therefore, the PSS uses six resource blocks with five
reserved subcarriers each side
astro ©
github.com/astro7x
linkedin.com/in/mrastro
The PSS is mapped to different OFDM symbols depending on which frame type is used
FDD/TDD

5. The PSS is mapped to the last OFDM symbol in slots 0 and 10,
The PSS is mapped to the third OFDM symbol in subframes 1 and 6
FDDTDD

6. Scheduling is the process through which eNB decides which UEs should
be given resources to send or receive data . In LTE, scheduling is done
per subframe levelAdd a little bit of body text
scheduling
Factors
astro ©
github.com/astro7x
linkedin.com/in/mrastro

7. Parameters and Scenario
Schedualing
UE computes the CQI value from downlink channel and sends it to the eNB
UE sends BSR reports to eNodeB
Based on BSR, CQI and UE QoS, eNodeB computes MCS value and PRB
mapping information and send it to the UE in downlink

8. astro ©
github.com/astro7x
linkedin.com/in/mrastro

9. Synchronization Signals (PSS and SSS)
https://www.mathworks.com/help/lte/ug/synchronization-signals-pss-and-
sss.html?requestedDomain=www.mathworks.com
Primary and secondary synchronization signals (PSS & SSS) in LTE
http://www.simpletechpost.com/2012/06/primary-and-secondary-
synchronization.html?m=1
MBSFN
http://rfmw.em.keysight.com/wireless/helpfiles/89600B/WebHelp/Subsystems
/lte/content/lte_sym_tbl_framesummary_mbsfn-rs.htm
Scheduling
http://www.simpletechpost.com/2014/05/basics-of-scheduling-in-lte.html?m=1
https://www.is-wireless.com/small-cells/lte-enb-scheduler/
astro ©
github.com/astro7x
linkedin.com/in/mrastro