CN105636242A

CN105636242A - Home office network based on Bluetooth technology

Info

Publication number: CN105636242A
Application number: CN201410575914.0A
Authority: CN
Inventors: 史军
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-10-25
Filing date: 2014-10-25
Publication date: 2016-06-01

Abstract

A home office network based on the Bluetooth technology of the invention comprises an antenna unit, a power amplifier and a Bluetooth module which are connected in series. The Bluetooth module is connected with a speech decoding circuit and a microprocessor. The microprocessor is connected with a high-speed data channel and an Ethernet interface, and the high-speed data channel is further connected with a modem. By using the Bluetooth technology, a personal computer, a mobile phone, a PDA, a television set, an air conditioner, a washing machine and other household appliances and office equipment can be connected at high speed without cables to form a convenient and practical 'wireless micro network'. Therefore, great convenience is brought to users, new service functions are derived, and the home office network can be closely combined with an information highway-communication network.

Description

Home office network based on Bluetooth technology

Technical field

The invention belongs to electronic communication field, relate to Digital Signal Processing, particularly a kind of home office network based on Bluetooth technology.

Background technology

An informationalized importance is exactly the Internet (Internet) and the fast development of mobile communication (mobilecommunication) now. It makes the life style of people, working method and mode of thinking all there occurs huge change, also stimulates people that the demand of the various data sources beyond computer and network service is growing simultaneously. The appearance of intelligent home network and development are filled with new vigor and vitality to information-intensive society, and reaching its maturity of bluetooth (bluetooth) technology serves, to this new tide, the effect added fuel to the flames undoubtedly.

Home network referred to before the information network of family with society is connected, and was coupled together by all of for household internal information equipment and the network that formed. Obviously, connecting the optimal technology of home network is wireless communication technology, and it instead of complicated cable in legacy network with microwave. Have many products and standard currently, with respect to this technology, such as the product of the companies such as Butterfly, Diamond, Proxim, Shavewave, wherein most representational is bluetooth and two kinds of technology of HomeRF. The advantage of bluetooth is in that the unification of global standards, has an interoperability, and can realize quick, flexible, safety, low cost, the data of low-power consumption and voice communication easily, and therefore Bluetooth technology development potentiality in family's Radio Network System is huge.

Summary of the invention

For overcoming the deficiency existing for prior art, the invention discloses a kind of home office network based on Bluetooth technology.

Home office network based on Bluetooth technology of the present invention, including the antenna element being sequentially connected with, power amplifier and bluetooth module, described bluetooth module is connected with speech decoding circuit and microprocessor, described being connected with high-speed data channel and Ethernet interface for processor, described high-speed data channel is also connected with modem.

Concrete, described power amplifier bandwidth frequency comprises 2.45G hertz, and described bluetooth module operating frequency is 2.45G hertz.

Concrete, described modem is embedded modem.

The present invention utilizes Bluetooth technology, household electrical appliance and the office equipment such as PC, mobile phone, PDA, television set, air conditioner, washing machine just can be connected at a high speed without cable, form a convenience, practical " wireless micro-network ", provide the user great convenience, and the service function made new advances can be derived from, so as to combine closely with information superhighway communication network.

Accompanying drawing explanation

Fig. 1 illustrates a kind of detailed description of the invention structural representation of the present invention.

Detailed description of the invention

Below the specific embodiment of the present invention is described in further detail.

Home office network based on Bluetooth technology of the present invention, including the antenna element being sequentially connected with, power amplifier and bluetooth module, described bluetooth module is connected with speech decoding circuit and microprocessor, described being connected with high-speed data channel and Ethernet interface for processor, described high-speed data channel is also connected with modem. .

As it is shown in figure 1, the hardware in Fig. 1 native system specifically includes that antenna element, 2.45GHz power amplifier module, bluetooth module, Codec, embedded microprocessor system, interface circuit and some auxiliary circuits. Additionally, main equipment also includes Ethernet interface and embedded Modem part.

The antenna of system belongs to microstrip antenna, and therefore antenna part can be made that volume is little, light weight. Air interface is based upon on the basis that antenna level is 0dBm, it then follows FCC (FCC) relevant level is the standard of the ISM band of 0dBm. Owing to bluetooth adopts frequency-hopping spectrum-expanding technology, so antenna requirement is broad-band antenna: initial frequency is 2.402GHz; Termination frequency is 2.480GHz. In order to resist multipath interference, native system is designed to be diversity antenna. The power amplifier of system is operated on the 2 4GHzISM frequency bands that the whole world can use, and the bandwidth of power amplifier is 2400 ~ 2483 5MHz. The communication distance of system design is 10m(0dB). If transmitting power increases to 20dB(100mw), distance can be made to reach 100m. The microprocessor system of main equipment adopts embedded system, and it is key technical problems in system. Saying certain angle, main equipment has played the effect of intelligent gateway. It is the core of whole family wireless network system, complete in family wireless network the conversion between various different communication protocol and information sharing, and with the data exchanging function between external communication network, be also responsible for each management from equipment and control simultaneously. Considering accept for ordinary family user, microprocessor adopts the cheap apparatus of non-PC, and master and slave device handler all adopts embedded Internet technology and high-performance microprocessor. The data that bluetooth module mainly completes the conversion of baseband portion agreement and the audio data stream sent here by digital speech processing circuit and microprocessor is sent here are integrated, and then give power amplifier after encoded, modulation and amplify wireless again sending. This module mainly includes two big units.

(1) less radio-frequency (RF) unit. The radio frequency unit power of bluetooth module also complies with the FCC requirement about ISM band, therefore, in use all can run into uncertain interference source. Bluetooth module has been specifically designed quick confirmation and frequency-hopping spectrum-expanding technology to guarantee that link is stable. , by the speed of 1600 times/s on 2.4GHzISM frequency band in a pseudo-random fashion, amounting to, 79 frequencies carry out redirecting (frequency, can obtain at most the channel of 79 1MHz bandwidth centered by 2.4GHz), so can be effectively prevented signal disturbing and weaken. Be operated in compared with the system of similar frequency bands with other, faster, packet is shorter for bluetooth frequency hopping, and this makes bluetooth all more more stable than other system. This external system additionally uses time division duplex (TDD) scheme and is used to realize full duplex transmission. FEC(forward error correction) use inhibit the random noise of long-distance link.

(2) base band (baseband, BB) and link management (linkmanager, LM) unit. BB is responsible for the transmission of frequency hopping and blue-teeth data and information frame; LM is responsible for establishment of connection and dismounting. The function that they realize includes: the support to SCO and ACL connected mode; Error Control, it is possible to adopt multiple inspection error correcting system, including forward error correction coding (FEC); The certification of physical layer and encryption; Link management. Digital speech processing circuit includes Codec and speech interface circuit two parts. Codec adopts CVSD coded system. CVSD(ContinuousVariableSlopeDeltaModulation) i.e. CVSD modulation. It is a kind of adaptive noise conceller technology, and it is not retransmitted VoP and also is able to obtain the audio coding of high-quality transmission. CVSD coding is good at process and is lost and impaired speech sample, even if bit error rate reaches 4%, and the voice or audible of CVSD coding. Speech interface circuit includes the audio frequency amplifier section of standard audio input and output and necessity. The interface section of system is provided with RS232, USB, UART, I2C interface and telephone line interface, and additionally main equipment also has Ethernet interface and ADSL jack. Wherein RS232, USB and UART are connected with computer, intelligent earphone, PDA and intelligent appliance equipment, complete the exchange of information. RS232 serial ports in main equipment is additionally operable to on-site parameters and arranges the upgrading with program. Embedded Modem is the physical interface of system and external communication network (Internet and public telephone network). Embedded Modem have employed simply, implementation flexibly, to reduce the complexity of system and to reduce the general domestic consumer dependency to Modem basic operating technical ability; Embedded Modem has needed the basic function of Modem, is responsible for being linked in external communication network family wireless network. Current situation according to Modem, the Modem of system have employed ADSL High-speed DSP standard. LAN(LAN can be directly connected to by Ethernet interface) in. System can be connected on DSL through inner high speed data channel and embedded Modem, demultiplexer through ADSLModem, its output logs on Internet by receiving household telephone wires (or by ISDN access way), thus can enjoy various information and service that ISP service provider provides. Auxiliary circuit includes liquid crystal display circuit, keyboard control circuit and electric power management circuit.

Software (protocol stack) unit of system is an independent operation part, does not bundle with any operating system. It meets the Bluetooth specification made. The protocol stack of system adopts hierarchy, is respectively completed the functions such as the filtration of data stream and transmission, frequency hopping and data frame transfer, establishment of connection and release, the control of link, the dismounting of data, quality of service, the multiplexing of agreement and point use. The protocol stack of master-slave equipment is slightly different, but is substantially all divided into 3 levels: underlying protocol, intermediate protocol and upper-layer protocol.

(1) underlying protocol. This layer includes base band BB and link management (LM). This area protocol has cured among bluetooth module. Application is very transparent by underlying protocol, is responsible for setting up physical radio link between bluetooth unit, constitutes piconet. LM also to complete the task as authentication and the secure contexts such as encryption, including generating and the connection status etc. of bluetooth unit in exchange encryption key, link check, the control of baseband data packet size, the electric source modes of blue-tooth radio equipment and clock cycle, piconet.

(2) intermediate protocol. This is the protocol section needing exploitation in system. Including logic link control with adapt to agreement L2CAP(LogicalLinkControlandAdaptationProtocol), business search agreement SDP(ServiceDiscoveryProtocol), serial ports simulation protocol RFCOMM and telephone control protocol TCS(is only in host device protocol stack) and ppp protocol. Logic link control and adapt to agreement (L2CAP) and complete the adaptation between base band and upper-layer protocol, and by protocol multiplexing, point with and reorganization operation be that high level provides data service and classification to extract. It allows upper-layer protocol and application receive or send the L2CAP packet up to 64000 bytes. It is extremely important part that business searches agreement (SDP), is the basis of all use patterns. It provides a kind of mechanism for upper level applications, finds service available in network and characteristic thereof. By SDP can inquiry apparatus information, business and feature thereof, and set up the connection between 2 or multiple bluetooth equipment after inquiry. SDP supports 3 kinds of inquiry modes: by class of service search, browse (browsing) by service attribute search and business. Serial ports simulation protocol RFCOMM also is located on L2CAP, and the higher level service (such as object exchange OBEX agreement) that string line is used as transmission mechanism, by emulating controling and data signal of RS232 in the base band of bluetooth, is provided transmittability for those by it. This agreement by Bluetooth Special Interest group BSIG based on etsi standard TS07.10 exploitation. Telephone control protocol includes telephone control specification binary system (TCSBIN) agreement and a set of phone control command (AT | commands). Wherein, TCSBIN defines the call control signalling set up between bluetooth equipment needed for voice and data call; AT | commands be then a set of can for controlling the order of mobile phone and modem under many uses pattern, it be also by BSIG ITU | on the basis of TQ.931, exploitation forms.

(3) upper-layer protocol. The general principle of design upper-layer protocol is just to try to absorb the agreement of existing maturation. The agreement that system is adopted is PPP and UDP/TCP/IP. PPP runs and on serial ports simulation protocol RFCOMM, for realizing the connection of point-to-point. In the host, IP packet can be forwarded in LAN by being based upon on the connection of PPP, or the IP packet that LAN comes is transmitted to PPP client. UDP/TCP/IP, by ietf definition, is mainly used in the communication on Internet. Additionally, the LAN part in main equipment is specifically designed to the access being made directly LAN.

Previously described each preferred embodiment for the present invention, preferred implementation in each preferred embodiment is if not substantially contradictory or premised on a certain preferred implementation, each preferred implementation can arbitrarily stack combinations use, design parameter in described embodiment and embodiment is merely to know the invention proof procedure of statement inventor, and it is not used to the scope of patent protection of the restriction present invention, the scope of patent protection of the present invention is still as the criterion with its claims, the equivalent structure change that the description of every utilization present invention is made, in like manner should be included in protection scope of the present invention.

Claims

1. based on the home office network of Bluetooth technology, it is characterized in that, including the antenna element being sequentially connected with, power amplifier and bluetooth module, described bluetooth module is connected with speech decoding circuit and microprocessor, described being connected with high-speed data channel and Ethernet interface for processor, described high-speed data channel is also connected with modem.

2. the home office network based on Bluetooth technology as claimed in claim 1, it is characterised in that described power amplifier bandwidth frequency comprises 2.45G hertz, and described bluetooth module operating frequency is 2.45G hertz.

3. the home office network based on Bluetooth technology as claimed in claim 1, it is characterised in that described modem is embedded modem.