Telecommunications – Carrier wave repeater or relay system
Reexamination Certificate
1999-01-27
2004-11-09
Hudspeth, David (Department: 2681)
Telecommunications
Carrier wave repeater or relay system
C455S140000, C455S426100
Reexamination Certificate
active
06816704
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication system suited for being applied to a case of, for example, receiving various kinds of broadcasting signals such as a digital satellite broadcasting, a digital ground broadcasting and so on or equivalent communication signals.
2. Description of the Related Art
In the past, the transmission side of a digital broadcast for carrying out a television broadcast, a radio broadcast and the like by transmission of digital data has been carried out by an arrangement shown in FIG.
1
. Here, a broadcasting center
1
has such an arrangement to carry out both transmission of a digital satellite broadcast and transmission of a digital ground wave broadcast, and carries out coding processes of respectively corresponding data of a video source
1
a
supplied by a contents provider and the like in a video coding unit
1
c
, an audio coding unit
1
d
, an accessory data unit
1
e
in a source coding unit
1
b
and multiplexing process of respectively coded data in a multiplexing unit if. Here, as for the coding process, video data and audio data are subjected to a coding process by, for example, a MPEG-2 system (one of standardized coding systems of moving images) (concretely, for example, video data by a process prescribed by MPEG-VIDEO ISO/IEC 13818-2 and audio data by a process prescribed by MPEG-2 AUDIO ISO/IEC 13818-3 or the like) and as for an accessory data, arbitrary coding is carried out. The multiplexing process in the multiplexing unit if is carried out in accordance with a predetermined system, for example, MPEG-2 System (ISO/IEC 13818-3). When subjected to the MPEG-2 System, the data is converted into a transport stream (hereafter, referred to as a TS) of this MPEG-2 System. The following explanation will be made on condition that the data is processed by this MPEG-2 System.
The coded signal (TS) in the source coding unit
1
b
is supplied to a channel coding unit
1
g
to be converted into a signal format to be practically transmitted. That is, a scramble process is carried out for energy diffusion in a scramble processing unit
1
h
, and in an error correcting coding unit
1
i
, generating and adding of an error correcting code are carried out. As for the error correcting coding here, a continuous code combining a blockcode as an outside signal and a convolution signal as an inside code are used. As the outside signal, for example, a lead solomon code and as the inside code, for example, a punctured code with a variable coding ratio are used. After the error correcting coding process is carried out, an interleave process is carried out in an interleave unit
1
j.
Then, in a case of a ground wave broadcast, a modulating process of an output from the channel coding unit
1
g
is carried out by an OFDM system (Orthogonal Frequency Division Multiplex system) in an OFDM modulating unit
1
k
and a conversion process of its modulated signal as a radio signal with a predetermined transmission band area is carried out in a RF conversion unit in and radio transmission is carried out from a ground wave antenna
2
. Also, in a case of a satellite broadcast, a modulating process of an output from the channel coding unit
1
g
is carried out in a QPSK modulating unit lm with a QPSK system (Quartenary Phase-Shift keying System) and a conversion process of its modulated signal as a radio signal with a predetermined transmission band is carried out in a RF modulating unit
1
o
and radio transmission is carried out toward a broadcasting satellite (or a communication satellite) by a satellite antenna
3
.
Then, as an arrangement on the reception side of a digital broadcasting signal transmitted with this arrangement, there is used a conventional arrangement as shown in
FIG. 2. A
ground wave reception antenna
4
and a satellite reception antenna
7
for receiving a broadcasting wave from a broadcasting satellite
6
are connected to a set-top box
5
which carries out a reception processing for a broadcasting signal and the ground wave reception antenna
4
is connected to a ground wave tuner
5
a
, and a signal received by the tuner
5
a
is demodulated in an OFDM demodulation unit
5
b
to obtain reception data. Also, the satellite reception antenna
7
is connected to a satellite tuner
5
c
and a signal received in this tuner
5
c
is demodulated in a QPSK demodulation unit
5
d
to obtain reception data.
Digital broadcasting data demodulated at respective demodulating units
5
b
and
5
d
are subjected to a deinterleave process in a deinterleave unit
5
e
, an error correcting process in an error correcting unit
5
f
and a descrambling process in a descramble unit
5
g
, whereby the original TS is restored. Then, video data and audio data with MPEG-2 system are subjected to a separation process in a multiplex separation unit
5
h
and decoded in a MPEG 2 decoder
5
i
. The video data decoded in the decoder
5
i
is made to be a video signal of NTSC system in an NTSC encoder
5
j
and the audio data decoded in the decoder
5
i
is made to be an analog audio signal in a digital/analog converter
5
k
, and these video signal and audio signal are supplied to and received by a monitor receiver
8
(or an ordinary television receiver) connected to the set top box
5
.
By connecting an apparatus called the set top box to a receiver in this manner, it becomes possible to watch the digital broadcast by a receiver corresponding to an analog ground wave.
Here, the arrangement has been shown of transmission and reception of the digital broadcast by the ground broadcasting wave and the satellite broadcasting wave, but in a case of a cable television (so-called CATV), the arrangement is the same until the channel coding on the transmission side and is different only in that a particular arrangement is used in the modulation process and the RF conversion process.
On the other hand, as an entirely different system from a watching system for the television broadcast, what they call a multimedia mobile access system (MMAC: Multimedia Mobile Access System) has been proposed. This access system is a high speed radio access system capable of being seamlessly connected to an optical fiber network (BISDN), in which a comparatively high frequency band such as 5 GHz and the like is used as a frequency band, a transmission rate is about 30 Mbps and a TDMA/TDD system (time division multiple access system) is used as an access system.
FIG. 3
is a diagram showing an overall arrangement of this multimedia mobile access system and here is an arrangement in a case of carrying out a service called an IP (Internet Protocol) access connected to an Internet network, and which comprises a various kinds of contents server
11
connected to an Internet network
12
and an MMAC base station
15
where communication is carried out through an ISDN (or general telephone line)
13
or an optical fiber network
14
. This base station
15
is connected to the ISDN
13
or the optical fiber network
14
by a user network interface (UNI).
The MMAC base station
15
carries out a radio communication with a portable information terminal
16
according to the above-mentioned transmission system and a relay between circuits
13
and
14
connected to the base station
15
and the terminal
16
.
FIG. 4
shows an arrangement of the MMAC base station which has conventionally been proposed, and here is an example of a case when the optical fiber network
14
, where communication is carried out by an asynchronous transfer mode (Asynchronous Transfer Mode: hereafter, referred to as an ATM), is connected. In the base station
15
, an interface unit
15
a
which carries out a user network interface with data (ATM cell) transmitted in terms of the ATM is connected to the optical fiber network
14
to carry out multiplexing of the ATM cell. In an ATM network circuit control unit
15
b
connected to an interface unit
15
a
, circuit control such as a call access and the like on the network is carried out. In an ATM cell diassembly/assembly uni
Hudspeth David
Maioli Jay H.
Ramos-Feliciano Eliseo
Sony Corporation
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