top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration

Facebook Login
Site Registration

Uplink RS (Reference Signal) in LTE?

+3 votes
11,297 views

These signals are messing me up all down the road. If somebody knows about this then the answers would be welcome.

posted Mar 11, 2014 by Rahul Vaidya

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+2 votes

Uplink Reference Signals are of two types in LTE:

  1. Demodulation Reference Signals (DM-RS): Which are used to enable coherent signal demodulation at ENodeB. These signals are time multiplexed with uplink data and are transmitted on the fourth or third SC-FDMA symbol of an uplink slot for normal or extended CP respectively, using the same bandwidth as the data.

  2. Sounding Reference Signal (SRS): Which is used to allow channel dependent (i.e. frequency selective) uplink scheduling as the DM-RS cannot be used for this purposes since they are assigned over the assigned bandwidth to a UE. The SRS is introduced as a wider band reference signal typically transmitted in the last SC-FDMA symbol of a 1 ms subframe as shown in Figure below. User data transmission is not allowed in this block, which results in about 7% reduction in uplink capacity. The SRS is an optional feature and is highly configurable to control overhead--it can be turned off in a cell. Users with different transmission bandwidth share this sounding channel in the frequency domain.

enter image description here

answer Mar 12, 2014 by Hiteshwar Thakur
Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...