JPH114427A - Catv equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit an incoming signal sent from pluralities of user terminals of a multiple dwelling house of a two-way CATV-LAN to a base station, without special introduction of wires or the like. SOLUTION: An outgoing signal f1 from a base station AQ1 is transmitted via a CATV channel L1, and a CATV terminal BQ1 to plural user terminals 1-7 of a multiple dwelling house CQ1, such as a mansion via CATV cables L2-1-L2-7. Each user terminal sends spread spectral modulation signals f21-f27, resulting from applying spread spectral processing and multiplying a carrier with an incoming signal f2 to a CATV terminal via an existing transmission line such as a CATV cable and a power line. The CATV terminal applies inverse spread and demodulation to a received carrier signal and transmits the signal to the base station via the CATV channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV device, and more particularly to a base station which is an operator without transmitting a special signal to an upstream signal transmitted from a user of an apartment house such as a condominium of an urban type two-way CATV-LAN. CA to transmit to the station
It relates to a TV device.

[0002]

2. Description of the Related Art Conventionally, a CATV apparatus as shown in FIG. 2 has been proposed. The CATV apparatus shown in FIG. 2 is a base station A in which a carrier sends out a downlink signal f51 such as information and data.
Q51, a CATV terminal BQ51, an apartment house CQ51 such as an apartment having a plurality of user terminals 51 to 57 for inputting the above-mentioned down signal f51, a base station AQ51 and CAT
A CATV line L51 for transmitting the downstream signal f51 between the V terminals BQ51, and a plurality of transmission lines CA which are wired in series between the CATV terminal BQ51 and the plurality of user terminals 51 to 57 and transmit the downstream signal f51 as described above.
TV cables L52-1 to L52-7 are provided.

[0003] A base station AQ51 is connected to one of CATV terminals BQ51 via a CATV line L51.
The other terminal BQ51 has a plurality of CATV cables L52
-1 to L52-7 are connected to a plurality of user terminals 51 to 57 of the apartment house CQ51, respectively. The operation of the conventional CATV apparatus configured as described above will be described below.

When a down signal f51 is transmitted from the base station AQ51 to the plurality of user terminals 51 to 57 of the apartment house CQ51, the down signal f51 is input to the CATV terminal BQ51 via the CATV line L51. The downlink signal f51 via the CATV terminal BQ1 is branched and transmitted via the CATV cables L52-1 to L52-7 which are serially wired between the CATV terminal BQ1 and the plurality of user terminals 51 to 57, and transmitted to the plurality of user terminals. Downstream signals f51 are input to 51 to 57, respectively.

[0005] In the above CATV device, information transmission is performed only in one direction, in which a business operator only provides information (downlink signal) to a user. CATV-LAN is becoming popular.

[0006]

However, in the conventional CATV apparatus, the wiring in the building is often a serial wiring, especially in a condominium or other apartment house.
Although there is no problem in the case of transmission of downstream signals, in the case of transmission of upstream signals, problems such as ingress noise occur, which makes it difficult to process signals. To do this, it is necessary to perform new wiring in an apartment that has already been wired, causing problems such as deteriorating aesthetics.In addition, even for new apartments and other multi-family apartments, the cost of equipment is more expensive than conventional wiring. In addition to the many cost problems, such as the existence of urban-type two-way CATV-LAN,
Standardization of the IEEE802.14 group specifications of the IEEE802 committee is underway, with 64QAM for downstream signals, QPSK (4-phase shift keying) and 16Q for upstream signals.
Bi-directional CA that must be transmitted using AM etc.
There were many difficulties in disseminating TV-LAN.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and does not require any special equipment to be used for transmitting upstream signals transmitted from a plurality of user terminals in an apartment house in a two-way CATV-LAN. CAT that can be easily transmitted to base stations
It is intended to provide a V device.

[0008]

A CATV apparatus according to the present invention that achieves the above object transmits a CATV cable from a base station via a CATV line to a plurality of user terminals of an apartment house or the like from a CATV terminal. , And each user terminal transmits the uplink signal to the CATV terminal via an existing transmission line such as a CATV cable or a power line as a spread spectrum modulated signal obtained by modulating a spread spectrum and a carrier.
The CATV terminal despreads and demodulates the transmitted carrier signal and transmits it to the base station via the CATV line.

In the CATV apparatus according to the present invention, a downlink signal transmitted from a base station is transmitted through a CATV line through a CATV line.
The signal is transmitted to the terminal, distributed and transmitted via a CATV cable serially wired between the CATV terminal and a plurality of user terminals of the apartment house. On the other hand, a plurality of user terminals transmit an uplink signal to the base station in order to form a bidirectional CATV-LAN, and the uplink signal is converted into a spread spectrum modulated signal obtained by modulating a spread spectrum and a carrier wave by using an existing transmission line (CATV-LAN). The signal is transmitted to a CATV terminal via a cable, a power line, or the like, and is transmitted as a despread demodulated uplink signal to a base station via a CATV line.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the CATV apparatus according to the present invention will be described below with reference to the drawings. The CATV apparatus of the present invention shown in FIG. 1 is a base station A for transmitting and receiving a downlink signal f1 and an uplink signal f2 in a bidirectional CATV-LAN.
Q1, the CATV terminal BQ1, and the above-mentioned down signal f
1 and a plurality of user terminals 1 to 7 transmitting and receiving the uplink signal f2
Apartments CQ1 such as condominiums and base stations AQ1
A CATV line L1 for transmitting a downlink signal f1 and an uplink signal f2 between the CATV terminal BQ1 and a CATV terminal BQ1;
CATV cables L2-1 to L2, which are a plurality of transmission lines that are wired in series between the terminal BQ1 and the plurality of user terminals 1 to 7 and transmit spread spectrum modulation signals f21 to f27, which are carrier signals of the down signal f1 and the up signal. -7
And are provided. In addition, the plurality of user terminals 1 to 7 are used when transmitting the uplink signal f2, and spread as a spectrum with the transmission of the uplink signal f2, and are spread as carrier spread modulated signals f21 to f27. 1
7 are respectively provided with spread-spectrum modulation circuits 1a to 7a for sending out via CATV cables L2-1 to L2-7 connected to CATV terminals L7 to L7, and the above-described spread-spectrum modulation signals f21 to f27 ( A despreading demodulation circuit 8 is provided for despreading and demodulating the carrier signal) and sending out the uplink signal f2 to the base station 1 via the CATV line L1.

[0011] The base station AQ1 is connected to the C
One of the ATV terminals BQ1 is connected, and the other of the CATV terminals BQ1 is connected to a plurality of CATV cables L2-1 to L2.
Multiple user terminals 1 to 1 of apartment house CQ1 via L2-7
7, respectively. The operation of the thus configured CATV apparatus of the present invention will be described below.

When a downlink signal f1 is transmitted from the base station AQ1 to a plurality of user terminals 1 to 7 of the apartment house CQ1, the downlink signal f1 is transmitted via the CATV line L1 to the CAT.
Input to V terminal BQ1. Further, the downlink signal f1 via the CATV terminal BQ1 is transmitted to a plurality of user terminals 1.
7 through the CATV terminals BQ1 and the CATV cables L2-1 to L2-7, which are serially wired between the user terminals 1 to 7, respectively. Downstream signals f1 are input to 1 to 7, respectively.

Next, in order to form a bidirectional CATV-LAN, not only transmission of the downlink signal f1 but also transmission of the uplink signal f2 between the base station AQ1 and the plurality of user terminals 1 to 7 is indispensable. In order to transmit the upstream signal f2 using an existing transmission line such as the CATV cables L2-1 to L2-7 and power line used for transmitting the downstream signal f1, the plurality of user terminals 1 to 7 are provided respectively. CATV cables L2-1 to L2 as spread spectrum modulation signals f21 to f27 obtained by modulating the upstream signal f2 by applying spread spectrum and carrier waves in the spread spectrum modulation circuits 1a to 7a.
-7 and CATV terminal B via existing transmission lines such as power lines
Send to Q1. Spread spectrum modulation signals f21 to f27, which are carrier signals input to CATV terminal BQ1.
Are despread demodulated through the despreading demodulation circuit 8 respectively, and as a restored uplink signal f2, the CATV line L1
And can be transmitted to the base station AQ1 without being affected by the ingress noise.

That is, an urban type two-way CATV-LAN
When transmitting an upstream signal in an apartment house such as an apartment in the system, CA
A spread spectrum modulation signal is superimposed and transmitted on a TV cable or a power line (all existing wiring including TV / CATV coaxial), and the above signal is despread and restored at a CATV terminal provided outside the apartment complex. Is capable of transmitting uplink signals between a plurality of user terminals and a base station without changing wiring by transmitting using a CATV line. Therefore, 64QAM is applied to downlink signals of the IEEE802.14 group specification of the IEEE802 committee. For the uplink signal, it is possible to standardize the transmission using QPSK or 16QAM.

[0015]

As is clear from the above description, according to the CATV apparatus of the present invention, an urban bidirectional CATV-LA is provided.
When transmitting uplink signals from user terminals of apartment houses such as N apartments, it is possible to transmit uplink signals without special equipment reinforcement, so data communication and voice communication from each user to the business operator are also possible. Yes, CATV-L
It can be widely used in general bidirectional CATV-LAN such as a cable modem for AN.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a CATV apparatus according to the present invention.

FIG. 2 is a block diagram showing a conventional CATV device.

[Explanation of symbols]

AQ1 Base station BQ1 CATV terminal CQ1 Apartment house (apartment, etc.) 1-7 Multiple user terminals L1 CATV line L2- 1 to L2-7 CATV cable (existing transmission line) f1 ... down signal f2 ... up signal f21 to f27 ... spread spectrum modulation signal (carrier signal)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chiharu Yokota 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. No. 1-1, Showa Electric Wire & Cable Co., Ltd.

Claims (1)

[Claims] 1. A base station (AQ1) to a CATV line (L1)
User terminal (1-7) of apartment house (CQ1) such as condominium from CATV terminal (BQ1) via
Down signal (f1) to the CATV cable (L2-1 to L2-
7) a CATV device that transmits the signal through a CATV cable, a power line, or the like as a spread spectrum modulated signal (f21 to f27) obtained by modulating an uplink signal (f2) by applying a spread spectrum and a carrier. A CATV apparatus, wherein the CATV terminal transmits the signal to the CATV terminal via an existing transmission line, despreads and demodulates the transmitted carrier signal at the CATV terminal, and transmits the signal to the base station via the CATV line.