W6158A Datasheet, PDF (4/13 Pages) Keysight Technologies – X-Series Measurement Application

04 | Keysight | CMMB X-Series Measurement Application N6158A & W6158A - Technical Overview
CMMB Standards Overview
China multimedia mobile broadcasting
(CMMB) is a mobile digital video standard
developed in China by the State Admin-
istration of Radio, Film, and Television.
Announced in 2006, CMMB network has
been deployed in more than hundreds of
cities in China.
The core part of CMMB is satellite and
terrestrial interactive multiservice infra-
structure (STiMi). It uses both satellite
and terrestrial signals to obtain effective
coverage both in densely populated cities
and in sparsely populated rural areas.
CMMB system supports single-frequency
network (SFN) and multiple-frequency
network (MFN).
Figure 1. The block diagram of CMMB system
CMMB physical layer can support N (1~39)
data streams at the same time (Fig 1).
Each data stream is configurable on chan-
nel coding, constellation and timeslots
allocation. That means CMMB signal can
broadcast up to 39 services (e.g., SDTV,
HDTV), giving each service different error
protections.
The CMMB broadcasting system uses
physical logical channels (PLCH) to trans-
mit the upper-layer services. The alloca-
tion of PLCH is shown in Fig 2. The PLCHs
include one control logical channel (CLCH)
and 1~39 service logical channels (SLCH).
CLCH contains CMMB broadcast system
control information and occupies only time
slot 0. SLCH can be configured to contain
one or more time slots to transmit one
broadcasting service.
Figure 2. CMMB PLCH