Introduction
DVB-H
17
Operating Manual 1008.0970.12 ─ 16
In addition, time-slicing allows to use the receiver to monitor neighbouring cells during
the off times. Performing the cell switching during an off time enables a smooth and
seamless service handover.
Time-slicing is mandatory for DVB-H.
2.2.3 Forward Error Correction for Multiprotocol Encapsulated Data
(MPE-FEC)
The MPE-FEC module provided with DVB-H impoves the carrier-to-noise (C/N) per-
formance and the Doppler performance in mobile channels and improve the tolerance
to impulse interference.
This is accomplished by adding an additional Reed-Solomon code (RS 255,191) in
conjunction with a block interleaver. The MPE-FEC module provides a specific frame
structure; the MPE-FEC frame. The MPE-FEC frame consists of an application data
table (ADT) with 191 columns for the IP datagramms and an Reed-Solomon data table
(RDT) with 61 columns for the Reed-Solomon parity information.
The IP datagramms are introduced vertically column-by-column. Empty cells and col-
umns are padded with zeros. The RS code is coded line-by-line: For each row of 191
IP datagramm bytes the 64 parity bytes are calculated, using the RS code. This pro-
vides a virtual interleaving effect, because all RS data bytes are calculated from the IP
datagramms.
After the coding is finished, the IP datagramms are encapsulated and transmitted in an
MPE section and the parity information data of each column in the RDT table are trans-
mitted in an MPE-FEC section.
Extensions to DVB-T
Summary of Contents for 1402.9557.02
Page 8: ...Preface DVB H 8 Operating Manual 1008 0970 12 16 Conventions Used in the Documentation ...
Page 44: ...DVB H User Interface DVB H 44 Operating Manual 1008 0970 12 16 Trigger Marker Clock Settings ...
Page 76: ...Remote control commands DVB H 76 Operating Manual 1008 0970 12 16 TPS Settings ...
