WO2011012750A1 - Procedimiento de distribución de señales de audio y vídeo inalámbricas en interiores - Google Patents
Procedimiento de distribución de señales de audio y vídeo inalámbricas en interiores Download PDFInfo
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- WO2011012750A1 WO2011012750A1 PCT/ES2010/070469 ES2010070469W WO2011012750A1 WO 2011012750 A1 WO2011012750 A1 WO 2011012750A1 ES 2010070469 W ES2010070469 W ES 2010070469W WO 2011012750 A1 WO2011012750 A1 WO 2011012750A1
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- radio
- dvb
- interface
- ieee
- broadband
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/02—Arrangements for relaying broadcast information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
Definitions
- the present invention relates to a method that aims to allow the sending of audio and video signals in an indoor radio signal distribution system, so that said audio and video signals are resistant to interference, ensuring coverage , remote monitoring and configuration of the system used and ensuring the quality of service. It is based on the novel use of a terrestrial Digital Video Broadcast (DVB-T) radio interface in the 5 GHz band.
- DVD-T Digital Video Broadcast
- the present invention applies to the field of telecommunications and, more specifically, to the construction and deployment of wireless communications networks inside buildings and their connection with other telecommunications networks.
- Hx WiFi, Wireless Fidelity
- wireless network that must be configured by the user and that is not supervisable by the telecommunications operator.
- IPTV IP internet protocol
- WiFi IEEE 802. Hx
- the equipment is specific to each radio standard and is not upgradeable, so in the case of improvements to the standard or the appearance of new standards it is necessary to dispense with the equipment and acquire new ones.
- the provision of the service requires the use of a wired connection.
- a control channel included in the same radio interface is used to perform certain control and supervision operations. Because the spectrum is limited, there is no dedicated air interface, but a control channel included in the same radio interface that is controlled or monitored is used.
- the collection of maintenance data related, for example, to the quality of the radio links is regulated by specific protocols within the specific GSM / GPRS standards / UMTS, etc.
- European patent application EP1619911 describes a method of collecting and transmitting maintenance information in mobile communication networks in which, once such information is taken locally in a mobile terminal, this information is transmitted to a remote server. which will be responsible for its processing, analysis and, if necessary, correction of some transmission parameter, depending on that processed data.
- the present invention solves the specific problem of wireless sending of audio and video signals of any kind in an indoor environment and subject to radio interference, either in a private home or in a building for public use.
- the use of a radio interface is fundamental, since most clients do not support the installation of new wiring in their home or office.
- the use of the licensed spectrum has a very high cost and that in most cases it is reserved for specific uses other than sending audio and video indoors.
- the invention also comprises sending control signals through a control channel configured to exchange control signals between said radio access node and said at least one client equipment over a radio control interface, said radio access node comprising and the client equipment a transmission / reception module of control signals configured to establish said control channel for transmitting and receiving wireless signals on said radio control interface.
- the control channel is configured so that a telecommunications operator can communicate with any of the system equipment and with any end equipment connected to those system equipment, through an access interface connected to a telecommunications access network termination. to perform remote tasks of configuration, operation, maintenance, supervision and management of said equipment, regardless of the status of the corresponding broadband radio interfaces. More specifically, at least one of those radio access node, client equipment, radio rerouter equipment and sensor equipment or actuators outside said system, is configured to implement radio functionalities that can be updated by software in a distributed manner, being able to update in a way individual its functionalities through changes in its software that allow to support new standards or variations thereof, and said control channel is configured to support said software loads to update the equipment.
- the sending of broadband signals and control signals between the radio access node and the client equipment is done through at least one equipment radio redirector comprising a broadband signal transmission / reception module configured for the transmission / reception of wireless broadband signals and a control signal transmission / reception module configured to transmit and receive wireless signals from a radio interface of control, so that the re-router regenerates said broadband and radio control signals and relays them between the radio access node and the client equipment.
- the client device is connected to an end device through an end device interface, said client device being configured to provide the end device with at least one communications service through the end device interface.
- at least one client device comprises a module configured to perform end device functions, where that client device is configured to provide the module with at least one communications service through an internal end device interface.
- the invention may also include one or more radio access nodes, client equipment and / or radio rerouter equipment, which may include a base unit and a plurality of insertable modules inserted in the base unit.
- the invention relates to a method whose main novelty is that it comprises the following phases:
- DVB Digital Video broadcast standard
- DVB-T Digital Satellite Video Broadcast
- DVB-S Digital Video Broadcasting Internet Protocol
- DVB-IP Digital Video Broadcasting Cable
- DVB-Co Portable Digital Video Broadcasting
- DVB-H - Receive multiple audio and video signals on the radio access node according to the Moving Picture Expert Group, MPEG format, in any of its variants,
- the radio access node forms a multiplexed DVB-T type signal that is emitted in the free-use band that goes from 5470 to 5725 MHz, instead of in the standardized bands of VHF or UHF. Consequently, the novelty of the invention lies in the use of this frequency band, not contemplated in the DVB standard.
- the advantages of using this type of DVB-T interface in the band 5470 to 5725 MHz will be described with respect to other radio interfaces already available for this frequency band, and as this combination not performed until Standard DVB-T date and free frequency band from 5470 to 5725 MHz allows reliable sending of audio and video signals in an interfering environment.
- one or more client computers capture the DVB-T signal in the band 5470 to 5725
- the client device may deliver these signals to the final device through the final device interface.
- the final equipment will be a television.
- the audio and video signals delivered through the final equipment interface may be of type TS-ASI (Transport Stream-Asynchronous Serial Interface),
- TS-SSI Transport Stream-Synchronous Serial Interface
- DVB-S DVB-S, DVB-IP, DVB-C or DVB-H
- any commercial standard used in televisions to receive the audio and video signal such as the Euroconnector (also known as SCART by the acronym of Syndicat des Constructeurs d'Appareils Radiorécepteurs et Telecommunicationviseurs, Trade Union of Radio Receiver Devices, which follows the standard CENELEC EN 50049-1: 1997) or HDMI (High-Definition Multimedia Interface, or High Definition Multimedia Interface.
- Euroconnector also known as SCART by the acronym of Syndicat des Constructeurs d'Appareils Radiorécepteurs et Telecommunicationviseurs, Trade Union of Radio Receiver Devices, which follows the standard CENELEC EN 50049-1: 1997) or HDMI (High-Definition Multimedia Interface, or High Definition Multimedia Interface.
- the generation of the new modified DVB-T type signal in the radio access node in the frequency band between 5470 and 5725 MHz is performed so that some of the data subcarriers of the modified DVB-T signal always overlap with the pilot subcarriers of the IEEE 802. Hn signal, so that the reception of pilot subcarriers by radio receivers that use the IEEE 802. Hn standard is hindered and thus facilitate said IEEE 802. Hn radio receivers to select a channel radio other than that used by the DVB-T broadband radio interface in the frequency band between 5470 and 5725 MHz, as set forth in said IEEE 802 standard. Hn.
- the generation of the modified DVB-T type signal also allows the overlay of the data subcarriers of the IEEE 802 signal. Hn with the pilot subcarriers of the modified DVB-T signal, occurs in less than 0.077 % of the occasions, to make it easier for IEEE 802. Hn signals to interfere to a lesser extent with the modified DVB-T broadband radio interface.
- the method of the invention comprises the following phases:
- control channel is also used to allow the audio and video signals that will be sent by the broadband radio interface from the radio access node to the final equipment from the client device.
- the radio control interface also uses the band 5470-5725 MHz, for which the radio control interface and the broadband radio interface use a coordinated frequency, in which the radio control interface performs a phase of selecting a frequency Among the following:
- the frequency of the radio control interface is matched with subcarrier 0 of the IEEE 802 standard.
- Hn which is a frequency in which the IEEE 802 standard conventionally. Hn does not emit a radio signal to facilitate homodyne detection in IEEE receivers. 802. Hn, so that interference on the radio control interface is avoided and IEEE 802.Hn radio channel switching is facilitated, since the IEEE 802.Hn standard states that when a subcarrier is detected at a frequency in the that must be free, the channel changes.
- the frequency of the radio control interface is matched with the pilot subcarrier 21 of the IEEE 802.Hn standard, so that the detection of the pilot subcarrier 21 is hindered and consequently the change of the IEEE 802.Hn channel is facilitated ,
- the frequency of the radio control interface is matched with the subcarriers 27 to 32 of the IEEE 802.Hn standard, which are not conventionally used, thus avoiding interference on the radio control interface.
- the sending of broadband signals and control signals between the radio access node and the client equipment is performed through at least said re-router equipment that is configured to receive radio frequency signals through a broadband radio interface and a radio control interface, both in the band 5470-5725 MHz, to regenerate said broadband and radio control signals and retransmit them between the radio access node and the client equipment and vice versa.
- One or more of the different equipment described can perform cognitive radio functions by analyzing the degree of spectrum occupation in the band of 5470 to 5725 MHz, so that they select the zone of the spectrum less interfered with in 8 MHz blocks, so that the radio receiver that supports the broadband radio interface is tuned in frequency by matching at least two of its receiving subcarriers exactly with two pilot subcarriers of the IEEE 802 standard. Hn , to detect the presence of said pilot subcarriers and determine that a particular radio channel is occupied by a signal of the IEEE 802 standard. Hn.
- the reception of standard DVB signals at the radio access node is performed by a decoder after which DVB-T encoding is performed to obtain the modified DVB-T signal in the band 5470-5725 MHz, while the signals in band MPEG base received at the radio access node are applied directly to the DVB encoder to obtain the modified DVB-T signal in the band 5470-5725 MHz.
- the reception of modified DVB-T broadband signals in the client equipment is carried out by means of a tuner, after which a DVB-T decoding is performed to be sent to the final equipment through the final equipment interface.
- the process of the described invention has the following advantages: * It has a higher power spectral density than the 802.11 WiFi based solution, so that in equal propagation conditions the DVB-T signal in the proposed 5 GHz band will have a better signal to interference ratio.
- the radio access node and the radio re-routing equipment are designed to support the sending of audiovisual signals through a radio interface to one or more client computers, while each client equipment delivers the audio and video signal to one or more several final teams, which will typically be televisions.
- Figure 1 shows a scheme of the signal distribution system according to application P20082049.
- Figure 2 shows a diagram of the radio access node of the previous figure.
- Figure 3 shows a diagram of the client equipment of figure 1.
- Figures 4, 5 and 6 show examples of frequency assignment for the broadband radio interface and the radio control interface, with respect to a type channel
- IEEE 802. Hn that could coincide in the same frequency band, according to the method of the invention.
- Figure 7 shows the scheme of the audio and video signal distribution system of Figure 1, according to an embodiment of the present invention, where the broadband radio interface consists of a DVB-T signal in the band 5470 to 5725 MHz, and where the control channel is used for the transmission of information on the selected signals from the client computer to the radio access node.
- the broadband radio interface consists of a DVB-T signal in the band 5470 to 5725 MHz
- the control channel is used for the transmission of information on the selected signals from the client computer to the radio access node.
- Figure 8 shows the particular embodiment of the radio access node of this invention, where the broadband radio interface consists of a DVB-T signal in the band 5470 to 5725 MHz of the previous figure.
- Figure 9 shows the particular embodiment of the client equipment of this invention, where the broadband radio interface consists of a DVB-T signal in the band 5470 to 5725 MHz of Figure 7.
- FIG. 1 illustrates a schematic of a possible embodiment of the wireless broadband signal distribution system 1 in accordance with application 20082049 and which is particularized in the present invention for the transmission of audio and video signals inside buildings by means of a DVB-T radio interface in the 5470 to 5725 MHz free-use band, in a environment of high radio interference.
- System 100 comprises the following elements:
- a radio access node 101 In this radio access node 101 reside the rerouting functions between the radio interfaces within a building and the gateway between the wireless network inside the building and an access network 170 (generally a fixed network , for example, copper or fiber optic pair to the home), in addition to the wireless network management functions in the building.
- an access network 170 generally a fixed network , for example, copper or fiber optic pair to the home
- the radio access node 101 comprises a broadband radio transmission / reception module 103, which in the present invention is particularized to support a DVB-T type radio interface in the free-use band from 5470 to 5725 MHz, and a control radio transmission / reception module 104.
- the system 100 also comprises one or more client equipment 110.
- Each client equipment 110 comprises a broadband radio transmission / reception module 113, which again in the present invention is particularized to support a DVB-T type radio interface. in the free-use band from 5470 to 5725 MHz, and a control radio transmission / reception module 114.
- the client equipment 110 is designed to provide an end device 120, which as an example may be a television, an end equipment interface 130, which by way of example may be an HDMI type interface, in order that This final equipment 120 can support the provision of a certain service, which in the present invention will be an audiovisual television service.
- the system 100 also comprises one or more radio re-routing equipment 180, which are used to extend the radio coverage offered by a radio access node 101.
- These radio re-routing equipment 180 are capable to capture the radio signals, regenerate them and reissue them in the most appropriate frequency band.
- each radio re-router equipment 180 comprises a broadband radio transmission / reception module 183, which in the present invention is particularized to support a DVB-T type radio interface in the free-use band from 5470 to 5725 MHz, and a control radio transmission / reception module 184.
- the radio re-routing equipment 180 is described below.
- the radio access node 101 communicates with the client equipment 110 and, optionally, with the radio redirector equipment (s) 180, by means of one or more broadband radio interfaces 140, which in the present invention is particularized to support a DVB-T radio interface in the 5470 to 5725 MHz free-use band.
- broadband radio interfaces 140 are used for the distribution of audio and video signals and their associated services throughout the building.
- the radio access node 101 communicates with the network of the telecommunications operator 170 via an access interface 150, which may be supported by wired or wireless means, such as twisted pair cable, fiber optic cable or radio connection.
- This radio access node 101 is placed in the place inside the building where the termination of the telecommunications access network 170 is available, for example the point where the copper pair or the optical fiber is available.
- the system 100 has a specific radio interface dedicated to the supervision and configuration of all the equipment of the system, and which in the present invention is particularized to support the selection of audio and video signals from the client equipment.
- This specific interface is designed so that it has greater radio coverage and is more resistant to interference and Transmission errors than any of the other interfaces used in the system.
- control radio interface 160 allows a specific communications channel to be implemented independent of the broadband radio interface.
- This specific communications channel is called a control channel and is used for the control, configuration and supervision of all the equipment installed in the building, and in this invention preferably to allow the audio content to be selected from the client equipment. video that will be sent by the radio access node wirelessly, through the broadband radio interface, as will be described later.
- the telecommunications operator can remotely control and monitor the operation of the wireless network in the customer's facilities, supported by the equipment client or intermediates 110 and radio re-routing equipment 180, regardless of the state in which broadband radio interfaces 140 are used to support the services.
- the radio access node 101 performs the following functions: transmission and reception functions (Tx / Rx) associated with broadband radio interfaces 140, such as detection and regeneration functions of radio signals from the broadband radio interface 140 and signal transmission functions to the broadband radio interface 140, using at all times the frequency band and the most appropriate standard; transmission and reception functions (Tx / Rx) associated with a radio control interface 160, which is described in detail below; signal routing functions between the different broadband radio interfaces 140 available in the equipment; gateway functions between the interface of access 150 with the operator network (access network 170) and the different broadband radio interfaces 140 available in the equipment; cognitive radio functions, by measuring the degree of occupation of different bands of the spectrum; configuration functions of the equipment that make up the system 100, supported by a control channel described below; and identification functions, by means of which the radio access node 101 informs the telecommunications operator, through the access network 170, about its characteristics, system equipment that is connected to it, radio technologies and the frequency bands used and the degree of spectrum occupation.
- Tx / Rx transmission and reception functions associated with
- Figure 2 illustrates a possible implementation of the radio access node 101 comprising: a configuration block 2011, responsible for configuring the functionality of the radio access node 101, such as its IP address, the system equipment that can be connected to he or the services that can be offered; an identification block 2012, in charge of storing information that allows identifying all the equipment that makes up the system; and a 2013 cognitive radio block, in charge of analyzing the electromagnetic spectrum and determining its degree of occupation, by means of radio power measurements detected in each band.
- a configuration block 2011, responsible for configuring the functionality of the radio access node 101, such as its IP address, the system equipment that can be connected to he or the services that can be offered an identification block 2012, in charge of storing information that allows identifying all the equipment that makes up the system
- a 2013 cognitive radio block in charge of analyzing the electromagnetic spectrum and determining its degree of occupation, by means of radio power measurements detected in each band.
- FIG. 2 also shows the broadband radio transmission / reception modules 103 giving access to a broadband radio interface 140 and the radio control transmission / reception modules 104 giving access to a radio control interface 160.
- the radio access node may be based on a base unit (not shown) where the functions associated with the equipment are performed and several radio insert modules, which are inserted into the base unit and implement the interfaces radio needed to communicate the radio access node 101 with the rest of the equipment that makes up the system.
- each client computer 110 can incorporate some or all of the functionalities of the final equipment 120 that is connected, integrating both into a single device.
- a non-limiting example of this integration can be a television set (end equipment 120) that integrates all the functions of the client equipment described in this document.
- the client computers 110 communicate with the radio access node 101 by means of one or more broadband radio interfaces 140, and which in the present invention is characterized in the case of a radio interface of the type
- the client computer 110 performs the following functions:
- Tx / Rx Transmission and reception functions associated with broadband radio interfaces 140, such as:
- Transmission and reception functions (Tx / Rx) associated with a radio control interface 160;
- the client equipment 110 may perform specific functions of an end equipment 120.
- the client equipment 110 may include decoding functions of digital television signals, of the type DVB-T or DVB-IP, delivering the already decoded signals to the TV (final equipment 120) through the final equipment interface 130; optionally, the client equipment 110 can even perform all the specific functions of an end equipment, integrating both into a single device - Cognitive radio functions, by measuring the degree of occupancy of different bands of the spectrum;
- the client equipment informs the radio access node 101 or the radio re-routing equipment 180 about its characteristics, final equipment 120 that are connected to it, radio technologies and frequency bands used, and degree of occupancy of the spectrum.
- Figure 3 illustrates an implementation of the client computer 110 comprising: a configuration block 3101, responsible for configuring the functionality of the client computer 110, such as its IP address, the system equipment that can be connected to it or the services that can be offered; an identification block 3102, responsible for storing information that allows the equipment to identify itself and the end equipment 120 that are connected to it; and a cognitive radio block 3103, responsible for analyzing the electromagnetic spectrum and determining its degree of occupancy, by means of measurements of radio power detected in each band.
- modules are accessed through a module 3104 which has the function of providing an interface 130 with the final equipment 120 and, optionally, functions of the final equipment.
- Figure 3 also shows the broadband radio transmission / reception modules 113 that give access to a broadband radio interface 140 and the control radio transmission / reception modules 114 that give access to a radio control interface 160.
- the client computer may be based on a base unit (not represented) where the own functions associated with the equipment and several radio insertable modules, which are inserted into the base unit and implement the necessary radio interfaces (broadband radio interfaces 140 and control radio interfaces 160) to communicate the client equipment with the radio access node 101 or with a 180 radio re-router equipment.
- the client device can also be based on a base unit, which comprises several radio insert modules
- Broadband radio transmission / reception module 113 that gives access to a broadband radio interface 140 and control radio transmission / reception module 114 that gives access to a radio control interface 160
- control radio transmission / reception module 114 that gives access to a radio control interface 160
- the radio re-routing equipment 180 which is used to extend the radio coverage offered by a radio access node 101, has a configuration equivalent to that of the client equipment also particularized for the case of a DVB-T type radio interface in the band of free use of 5470 to 5725 MHz, from the radio access node 101 and / or other radio re-routing equipment 180.
- the radio re-routing equipment 180 takes the signals received from the broadband radio interfaces 140, reconditions and resends them, using the most suitable frequency band, depending on the degree of use and interference of the radio spectrum.
- the radio re-router equipment 180 performs the following functions:
- Tx / Rx Reception and transmission functions
- Tx / Rx Transmission and reception functions
- Cognitive radio functions by measuring the degree of occupation of different bands of the spectrum.
- Radio re-router equipment 180 informs the radio access node 101 about its characteristics, system equipment that is connected to it, radio technologies and frequency bands used and degree of spectrum occupancy.
- the radio re-router equipment 180 communicates with the radio access point or node 101 and with the client or intermediate equipment 110 via one or more broadband radio interfaces, which in the present invention is particularized in the case of a radio interface DVB-T type in the free-use band from 5470 to 5725 MHz.
- both the radio access node 101, as the client equipment 110 or the radio re-routing equipment 180 can incorporate insertable modules, preferably of small size, that implement radio interfaces, so that they are easily modularly upgradeable.
- both radio access node 101, client computers 110 or radio re-routers 180 can be updated by software updates resident in any of the modules that comprise it, so that they can work with new versions of a radio communication interface or with new standards.
- the broadband radio interface implemented by all the elements that make up the system consists of a modified DVB-T type signal, based on the ETSI EN 300 744 standard, so that the spectrum area used for its transmission via radio is the 5 GHz free use band, and specifically the area of the spectrum ranging from 5,470 GHz to 5,725 GHz, instead of the VHF-UHF spectrum described in the ETSI EN 300 744 standard in its section "4.8. 3 Center frequency of RF signal (for 8 MHz UHF channels) "(center frequency of the RF signal for 8 MHz UHF channels).
- the main radio standard that makes use of the aforementioned bands is the IEEE 802.11, also known as WiFi (Wireless Fidelity), in its variants IEEE 802.11a and IEEE 802. Hn, although The ability to send information at present is only commercialized in its Hn variant, the variant being obsolete.
- WiFi Hn standard suffers from the following disadvantages with respect to the present invention.
- the IEEE 802.Hn standard employs a minimum bandwidth of 20 MHz for sending any type of signal, while the DVB-T standard occupies a maximum of 8 MHz per radio channel.
- the data transmission capacity of the DVB-T signal depends on the characteristics of the radio channel. In environments with high propagation losses and echoes with a high propagation delay, typical of outdoor broadcasting, it is necessary to use simple modulations such as QPSK and high guard times, so that for busy 8 MHz bandwidths the rate that is may reach the order of 5 Mbit / sg, while in favorable environments you can reach a speed of up to 31 Mbit / sg.
- the DVB-T standard may support two high definition audio and video channels with encoding MPEG-2 and flow per channel of 10 Mbit / sg.
- the spectral density of the emitted power if the modified DVB-T interface used in this invention is used will be in the following ranges, in case it is necessary to send two high definition video channels in a bandwidth of 8 MHz:
- a maximum of 80 mW may be emitted (due to the limitation of a maximum of 10 mW / MHz), the power spectral density being evidently 10 mW / MHz.
- the spectral density of emitted power will be between 125 and 62.5 mW / MHz.
- IEEE 802. Hn the most favorable situation for IEEE 802. Hn is taken, one in which a single channel of 20 MHz bandwidth It is capable of supporting four HDTV (High Definition TV) channels, with an aggregate transmission rate of 40 Mbit / sg. Under these conditions, the spectral density of emitted power will be in the following range:
- a maximum of 200 mW may be emitted (due to the limitation of a maximum of 10 mW / MHz), the power spectral density being 10 mW / MHz.
- the spectral density of emitted power will be between 50 and 25 mW / MHz.
- DVB-T assumes that if modified DVB-T and WiFi Hn signals coexist, all things being equal
- the DVB-T signal in the band 5470 to 5725 MHz will be in the receiver at least 4 dB above the WiFi Hn, resulting in a better signal to ratio reception noise thanks to this higher power spectral density.
- the IEEE 802.Hn standard has radio spectrum analysis capabilities, so that it automatically selects a different radio channel in case of detecting high interference.
- the IEEE 802 standard. Hn will use a different radio channel than the one used by the DVB-T interface in the band 5470 to 5725 MHz, since the DVB-T interface in general will always have a higher power than IEEE 802. Hn, so that this The latter will be forced to select another channel to avoid interference, as set out in the IEEE 802.Hn standard.
- the modified DVB-T signal occupies an area of the spectrum such that matches its data subcarriers with the pilot subcarriers of the IEEE 802.Hn signal, as described below.
- the IEEE 802.Hn signal consists of an OFDM multiplex (Orthogonal Frequency Division Multiplexing, or orthogonal frequency division multiplexing), which consists of 48 data subcarriers, 4 pilot subcarriers, 6 subcarriers not occupied in the lower zone of frequency, 6 subcarriers not occupied in the upper frequency zone, and a central subcarrier not occupied to facilitate homodyne signal detection.
- the central subcarrier is numbered 0 (figures 4 to 6), with the subcarriers numbered from -32 (lower frequency) to 32 (higher frequency).
- the pilot subcarriers are numbered as -21, -I 1 1 and 21, and the unoccupied subcarriers are -32 to -27, 0, and 27 to 32, all subcarriers being separated at a frequency of 312, 5 KHz
- the DVB-T signal there are 6 possible OFDM subcarrier configurations, depending on whether a bandwidth of 8, 7 or 6 MHz is used, and whether the so-called 8K mode (6816 subcarriers) or 2K ( 1704 subcarriers). As an example, and without excluding the use of any of the other combinations, the case of an 8K DVB-T signal with an 8 MHz bandwidth.
- the 8K DVB-T signal with an 8 MHz bandwidth has 6816 OFDM subcarriers, each separated by a frequency of (1/896 ⁇ sg) Hz.
- the subcarriers are they number from 0 (lowest frequency, figures 4 to 6) to 6816 (highest frequency).
- the frequency of the DVB-T OFDM multiplex is selected so that subcarriers of DVB-T data is located at exactly the same frequency as two of the IEEE 802 pilot subcarriers. Hn, this being made possible by the fact that the IEEE 802 pilot subcarriers. Hn are separated an integer number of DVB-T type subcarriers 8K and 8 MHz bandwidth, specifically separated 3920 x (1/896 ⁇ sg) Hz. The fact that IEEE 802 pilot subcarriers.
- Hn are separated according to an integer number of DVB-T subcarriers has not been developed in a way intended by either of the two standards (IEEE 802.11 and DVB-T), and is essential to efficiently overlay DVB-T data subcarriers on IEEE 802.Hn pilot subcarriers.
- the separation between IEEE 802.Hn pilot subcarriers is exactly that between 980 DVB-T type 2K subcarriers in an 8 MHz bandwidth.
- This exact relationship between the separation of IEEE 802. Hn pilot subcarriers and DVB-T subcarriers also occurs in the case that the DVB-T signal uses a bandwidth of 7 MHz.
- the separation between IEEE 802 pilot subcarriers. Hn is exactly that between 4480 DVB-T type 8K subcarriers in a 7 MHz bandwidth.
- the separation between pilot subcarriers of IEEE 802. Hn is exactly that between 1120 DVB-T type 8K subcarriers in a 7 MHz bandwidth.
- Hn is intended to make it difficult to receive pilot subcarriers at the IEEE 802.Hn receiver, and since pilot subcarriers are the most important for correct decoding of the signal, thus forcing the selection of a different area of the spectrum by the 802.Hn interface.
- the selection of the specific frequency position of the OFDM DVB-T multiplex is possible in many ways, and by way of example one of them is described in Figure 4, in the case of using the 8K mode in an 8 MHz bandwidth
- the frequency of the first DVB-T subcarrier, carrier numbered 0 in DVB-T and pilot type is selected at an FS separation frequency ( Figure 4) of 398,437.5 Hz above the carrier numbered as - 32 in IEEE 802.Hn.
- the DVB-T data subcarrier numbered 2723 coincides in frequency with the IEEE 802.Hn pilot subcarrier numbered as - 21, both located 3,437,500 Hz above said IEEE 802.Hn subcarrier -32
- the DVB-T data subcarrier numbered 6643 coincides in frequency with the IEEE 802.Hn pilot subcarrier numbered as -7, both located 7,812,500 Hz above that sub-carrier -32 of IEEE 802. Hn.
- a DVB-T data subcarrier will always coincide with an IEEE 802. Hn pilot subcarrier, making it difficult to receive the latter.
- the present invention also takes into account the limitations imposed by the frequency tolerance of the IEEE 802. Hn signals and the frequency tolerance of the transmitted modified DVB-T signal.
- the most unfavorable case is that where the IEEE 802. Hn signal is transmitted in the high range of the spectrum, about 5725 MHz, and that the frequency tolerance of the IEEE 802.Hn signal is so poor that the IEEE 802 pilot subcarriers .Hn are transmitted on the frequency where the data carriers should be issued.
- the DVB-T transmitter should be able to adjust its transmit frequency with an accuracy of 0.1 x (312.5 10 3/5725 10 6 ) so that the DVB-T data subcarriers are separated from the IEEE 802.Hn pilot subcarriers a maximum of 31.25 KHz, where most of the energy of the IEEE 802.Hn pilot subcarrier is concentrated.
- the accuracy of 0.1 x (312.5 10 3/5725 10 6 ) has the value 5.4 ppm (parts per million), which is within the capabilities of commercial low cost crystals.
- the DVB-T subcarrier numbered 0, which is always pilot type, is at a frequency of 398,437.5 Hz above the carrier numbered as -32 in IEEE 802 .Hn, frequency located between the sub-carriers -31 and -30 of 802.Hn, sub-carriers that are also never used to allow the availability of a band of guard frequency between IEEE 802. Hn signals, and thus the DVB-T pilot subcarrier 0 will always be free of interference from 802. Hn.
- the other subcarrier permanently dedicated to pilot in DVB-T, 6816 is at a frequency of 8,005,580.36 Hz above the carrier numbered as -32 in IEEE 802. Hn, frequency located between sub-carriers -7 (7,812,500 Hz above -32) and -6 (8,125,000 Hz above -32) of 802. Hn, and thus the pilot sub-carrier 6816 of DVB-T will always be free of interference from 802.Hn by not matching its subcarriers -7 and -6.
- the IEEE 802.11 data subcarriers numbered as -26, -23, -20, -17, -14 - 11 and -8 match the DVB-T subcarriers numbered as 1323, 2163, 3003, 3843, 4683, 5523 and 6363, although as in DVB-T only one in four symbols on these subcarriers is pilot type, only 25% of the interference occurs.
- an 8K DVB-T signal with 8 MHz bandwidth dedicates 2271 of its subcarriers to be used as a pilot in one of every four OFDM symbols
- the novelty of the present invention is that thanks to these two differential characteristics of the modified DVB-T standard for the 5470 to 5725 MHz band with respect to the IEEE 802.Hn standard, first of all a better signal-to-noise ratio in reception thanks at a higher power spectral density, and secondly the Reduction of interference on the DVB-T interface due to the IEEE 802 standard. Hn is forced to select a different radio frequency channel, the use of the modified DVB-T standard to work in the 5470 to 5725 MHz band allows sending of audio and video signals in indoor environments with a reliability, measured as resistance to interference, superior to that of existing methods, and in particular superior to IEEE 802. Hn.
- DVB-T signals may use any frequency between 5470 and 5725 MHz, using the same frequency selection principles (coincidence of DVB-T data subcarriers with IEEE 802.Hn pilot subcarriers) discussed above.
- DVB Digital Video Broadcast standard
- DVB-T Digital Terrestrial Video Broadcast
- DVB-S Digital Video Broadcasting Internet Protocol
- DVB-IP Digital Video Broadcasting Cable
- DVB-Co Portable Digital Video Broadcasting
- MPEG Moving Picture Expert Group
- the system 100 implements a specific radio interface called radio control interface 160 that supports a control channel used for the management tasks of the entire system 100, and in the present invention preferably to support a return channel that allows from the client equipment to select the audio and video signals that will be sent by the broadband radio interface from the radio access node.
- the radio control interface 160 is designed so as to maximize coverage and resistance to errors and propagation problems. This is achieved through a low net rate of data transmission, using coding techniques to increase the redundancy of the signal and thereby the resistance to errors.
- it implements spectrum management techniques, using at all times the radio channel with less radio occupation and less interference.
- HARQ Hybrid Automatic Repeat-Request
- the radio control interface and the control channel it supports are implemented in the manner described in patent application P200802049.
- the present invention also introduces a novelty in the implementation of the radio control interface with respect to what is described in patent application P200802049, in terms of the frequency of use used.
- the present invention includes the possibility of using the band ranging from 5470 to 5725 MHz, also used by the broadband radio interface.
- the radio control interface is emitted at any of the frequencies corresponding to the subcarriers 0 of IEEE 802. Hn, specifically at the frequencies according to the relationship
- nch is the IEEE 802. Hn radio channel number, and in the 5470 to 5725 MHz band it is between 96 and 140, with 4 jumps (for example, 96, 100, 104, 108, etc.).
- the reason for selecting the frequency of the subcarriers 0 to emit the radio control interface 160 is twofold. First, subcarrier 0 of an OFDM multiplex of 802. Hn, is always unused, so that the radio control interface will not suffer interference from IEEE 802. Hn. Second, by occupying the radio control interface, the frequency of the IEEE 802.11 subcarrier 0, which the IEEE 802.Hn standard leaves unused to facilitate homodyne demodulation of the IEEE 802.Hn signal in the receivers, thus hinders the correct reception of the IEEE 802.Hn signal and is facilitated so that IEEE 802.Hn selects a different radio channel than the one used by the DVB-T interface in the band 5470 to 5725 MHz.
- the broadband radio interface and the radio control interface both in the 5470 to 5725 MHz band, work in the following way.
- the broadband radio interface 140 consisting of a DVB-T signal in the band 5470 to 5725 MHz
- Hn IEEE 802 channel nch channels between 96 and 140
- the radio control interface is located at the frequency of subcarrier 0 of the same channel. This reinforces the effects of DVB-T data subcarriers that overlap with IEEE 802-H and -7 sub-carrier pilots. With the effects of the radio control interface that overlaps with the IEEE 802.Hn subcarrier 0, thus facilitating the IEEE 802.Hn radio interface to select a different radio channel.
- nch is the IEEE 802.Hn radio channel number, and in the 5470 to 5725 MHz band it is between 96 and 140, with 4 hops (for example, 96, 100, 104, 108, etc.).
- the reason for selecting the frequency of the subcarriers 21 to emit the radio control interface is twofold.
- subcarrier 21 of an 802.Hn OFDM multiplex is always used as a pilot, so that the radio control interface will always overlap on it and make it difficult to receive the IEEE 802.Hn signal, thus facilitating IEEE 802.Hn select a different radio channel.
- the frequency separation between the radio control interface and the DVB-T upper subcarrier, 6816 in Figure 5 can be adjusted to be greater than 7,607,142.9 Hz, so that it is not produce intermodulation products between DVB-T subcarriers and the radio control interface that overlap the DVB-T signal, which facilitates the physical implementation of the broadband radio interface and The radio control interface, when less linear radio devices are required.
- the broadband radio interface and the radio control interface both in the 5470 to 5725 MHz band, work in coordination as follows.
- the broadband radio interface consisting of a DVB-T signal in the band 5470 to 5725 MHz, overlaps with an IEEE 802 channel.
- Hn IEEE 802 channel nch channels. Hn between 96 and 140
- the radio control interface is located at the frequency of the subcarrier 21 of the same channel. This reinforces the effects of DVB-T data subcarriers that overlap with IEEE 802-H and -7 sub-carrier pilots. With the effects of the radio control interface that overlaps with the IEEE 802.Hn pilot subcarrier 21, thus facilitating the IEEE 802.Hn radio interface to select a different radio channel.
- the radio control interface is emitted at any of the frequencies corresponding to subcarriers 27 to 32, specifically at frequencies according to the relationship
- nch is the IEEE 802.Hn radio channel number, and in the 5470 to 5725 MHz band it is between 96 and 140, with 4 hops (for example, 96, 100, 104, 108, etc.).
- the reason for selecting the frequency of subcarriers 27 to 32 to issue the radio control interface is twofold. First, subcarriers 27 to 32 of an 802.Hn OFDM multiplex are always unused, so that the radio control interface will not receive interference from IEEE 802.Hn. Second, the frequency separation between the radio control interface and the DVB-T upper subcarrier, the 6816 in the Figure 6, can be adjusted to be greater than 7,607,142.9 Hz, so that intermodulation products between DVB-T subcarriers and the radio control interface that overlap the DVB-T signal are not produced, which It facilitates the physical implementation of the broadband radio interface and the radio control interface, by requiring less linear radio devices.
- all the equipment of the system 100 implements the cognitive radio, so that the state in which the radio spectrum is located is analyzed and the frequency band most suitable for the broadband radio interface and the radio interface is selected at any time of control .
- the cognitive radio function may consist of a spectral analysis of the radio spectrum
- the implementation is based, without excluding other alternative embodiments, on one or more low noise amplifiers that detect the radio signals, which are converted to intermediate frequency by means of mixers and a tunable local oscillator, so that tuning The frequency of the local oscillator is possible to select different sections of the radio frequency spectrum detected by the low noise amplifiers.
- the intermediate frequency signals are filtered by channel band pass filters. Once the intermediate frequency signals are filtered, their power is detected by conventional techniques.
- All the elements that make up the system 100 support the broadband radio interface, so that all of them have broadband radio transmission / reception modules 103,183, 113.
- these modules must be capable of transmitting and receive a DVB-T type signal in 8K or 2K mode, with 8, 7 and 6 MHz bandwidth, in the frequency band 5470 to 5725 MHz.
- the DVB-T signal in 8K or 2K mode, with 8 or 7 MHz bandwidth has subcarriers that can exactly match the position of two IEEE 802 pilot subcarriers. Hn.
- a possible embodiment of the Cognitive Radio is based on the use of broadband radio transmission / reception modules, which when desired would be used to track the presence of IEEE 802.
- the broadband radio transmission / reception modules 103,183, 113 are configured when desired so that they do not support the broadband radio interface, so that they are configured in 8K or 2K mode with 8 or 7 MHz bandwidth and only as receivers.
- the exact frequency at which the broadband radio transmission / reception modules are tuned into reception 103,183, 113, is such that some of the DVB-T subcarriers that these modules are ready to detect exactly match two of the subcarriers pilot (subcarriers -21, -I 1 1 and 21) that could use an IEEE 802 radio interface. Hn that could be occupying the same spectral zone. If an IEEE 802.
- the broadband radio transmission / reception module could decode two IEEE 802.Hn pilots and determine that the radio channel is occupied by an IEEE 802.Hn signal.
- the advantages of this implementation of Cognitive Radio are two. First, the detection of pilot subcarriers is always more reliable than a simple detection of radio power in an area of the spectrum, as the pilot signals are known and emitted in a deterministic way in order to facilitate their detection. Secondly, in order to implement Cognitive Radio, no additional devices are necessary in the equipment that makes up the 100 system, being able to take advantage of the broadband radio transmission / reception modules that must necessarily be integrated in all the equipment of the system 100.
- FIG. 7 shows a general scheme of the invention, particularized for a broadband interface 140 of DVB-T type modified for operation in the band 5470 to 5725 MHz.
- This interface in the present invention is unidirectional, starting from of the radio access node 101, being received if necessary by a radio re-router 180 (not shown in Figure 7), and received on a client computer 110.
- This broadband radio interface is used to carry audio and video signals received by the radio access node 101 through the access interface 150, signals that are received according to a multitude of formats, for example and without excluding other possible formats, such as DVB-T, DVB-IP, DVB-S, DVB-H, DVB-C, MPEG over TS-ASI, TS-SSI, TS, TS-SPI, PS.
- formats for example and without excluding other possible formats, such as DVB-T, DVB-IP, DVB-S, DVB-H, DVB-C, MPEG over TS-ASI, TS-SSI, TS, TS-SPI, PS.
- the client equipment 110 incorporates an additional interface with respect to that described in patent application P200802049 interface called user control interface 102.
- This interface is used so that the user can select from the equipment client 110, which will be connected to the final equipment 120, which will generally be a television, the audio and video signals that you want to be delivered to your final equipment.
- the radio access node can receive multiple audio and video signals through the access interface, but will only broadcast through the broadband radio interface 140 those contents selected by the user in order to use only the strictly necessary radio spectrum.
- this selection is transmitted from the client equipment to the radio access node via the radio control interface 160.
- radio access node 101 which part of what is described in Figure 2, and shown in Figure 8, can be seen as a set of audio and video signals are received by the interface 150.
- These signals can be of various types and without being exhaustive and without excluding other formats, the following examples can be described:
- Signals of type DVB-T, DVB-IP, DVB-S, DVB-H, DVB-C must be decoded in a decoder 103a to extract the MPEG type signals they contain and deliver them to a DVB-T encoder block 103b via one or more interfaces 103e of type TS-ASI, TS-SSI, TS, TS- SPI, PS.
- the coding block DVB-T 103b of the node Radio access 101 From the MPEG signals on TS-ASI, TS-SSI, TS, TS-SPI, PS, whether they come from demodulator block 103a or directly from access interface 150, the coding block DVB-T 103b of the node Radio access 101 generates a DVB-T signal in the 5470 to 5725 MHz band.
- a DVB-T signal can contain a very large number of audio and video content and occupy a very high radio frequency spectrum, which could not be supported by the DVB-T broadband radio interface in the band 5470 to 5725 MHz.
- the demodulation process only audio and video content that must be transmitted by the broadband radio interface, from according to the selection made by the user through the user control interface 102, and transmitted from the client computer 110 to the radio access node 101. In this way it is possible to transmit only a subset of the received audio and video signals by the access interface, bearable by the broadband radio interface.
- the emission of a DVB-T signal in the 5 GHz band cannot be performed by a simple frequency conversion of a standard DVB-T signal in the VHF / UHF band to the 5 GHz band, for medium of a local oscillator 103c and a mixer 703d.
- COFDM modulation Coded Orthogonal Fequency Division Multiplexing, or Division Multiplexing in the Coded Orthogonal Frequency
- DVB-T requires that the frequencies of the subcarriers that compose it be always an integer multiple of the inverse of the period of COFDM symbol, and this condition will not be met when converting in frequency with a local oscillator 103c that is not synchronized with the clock with which the DVB-T signal was generated in the original VHF / UHF.
- the demodulation of the DVB-T signal allows to obtain the original audio and video signals in baseband, and from them generate a new DVB-T signal in the 5 GHz band using now if a local oscillator 103c is used to generate the frame of OFDM symbols and subcarriers in the band 5470 to 5725 MHz, and thus ensuring the relationship between the frequencies of the subcarriers and the inverse of the COFDM symbol period.
- the radio band interface anchal40 passes to a block tuner 113a, which is responsible for delivering a COFDM signal in baseband or intermediate frequency to a DVB-T 113b demodulator.
- the DVB-T 113b demodulator demodulates the signal it receives and delivers at its output one or several audio and video signals in MPEG format, supported by frames of type TS-ASI, TS-SSI, TS, TS-SPI, PS.
- These last frames can be delivered directly to the final equipment 120 through the final equipment interface 130, or can be previously converted to another format before being delivered to the final equipment 120.
- This format can be, by way of example and without limitation the possibility of using another type, HDMI, DVB-T in VHF / UHF bands, analog audio and video in baseband, Euroconnector signal, etc.
- Figure 9 shows how the client computer 110 has a user control interface 160, which allows a user to communicate with the client computer 110. This communication is intended to select the audio and video signals that will be delivered by the client equipment 110 to the final equipment 120, so that the selection made by the user is transferred from the client equipment 110 to the radio access node 101 via the radio control interface 160.
- the radio access node performs a scan of all the audio and video signals it receives through the access interface.
- the radio access node tunes all radio channels of a DVB-T, or DVB-S signal, or takes a TS-ASI, and extracts the TS
- MPEG Transport Stream (MPEG Transport Stream, or MPEG Transport Stream) existing.
- PSI Program Specific Information
- the radio access node 101 registers all the programs it has detected, and sends the complete list of them to the client computer 110 through the radio control interface 160, where this information is also registered.
- the user connects to the client computer 110 via the user control interface 160, and requests information about the available programs.
- This information may be presented to the user through the user control interface and be displayed on the device that connects to this user control interface 102, or be presented to the user through the final equipment interface to be displayed. in the final equipment, which as an example can be a television.
- the user can select them one by one, acting through the user control interface 102, for their audiovisual identification and possible association with a keyword.
- the user when selecting a certain program, the user will be able to verify that it corresponds to a specific commercial television station, and assign a name or number to it, or it will be able to verify that it is the signal from a local audio and video player connected to your radio access node, and reassign it a name or number.
- the user may at any time select the audio or video content, or program, that he wishes to view on his final device, selecting from a list of keywords that will be presented to him on the final device 120 or on the device that connects to the user control interface 102.
- the information about the selection is transmitted from the client device to the radio access node, passing if necessary through a rerouter device, by means of of the radio control interface.
- the radio access node When the radio access node receives this information about the program selected by the user, it goes on to include the program among the programs that are multiplexed and encoded in the DVB-T 103b encoder block shown in Figure 7 to be subsequently transmitted by the interface Broadband radio 140, DVB-T type in the band 5470 to 5725 MHz. Information on the position of the selected program in the multiplex that is sent on the DVB-T signal in the band 5470 to 5725 MHz is communicated to the client computer 110 through the radio control interface 160, by way of example by means of PSI fields.
- the broadband radio interface 140 consisting of the DVB-T signal in the band 5470 to 5725 MHz, is received by the client equipment 110, passing in case it is necessary by a rerouter equipment, and is tuned by the block Tuner 113a shown in Figure 9.
- the tuner block delivers a COFDM signal, in baseband or intermediate frequency, to the DVB-T decoder 113b shown in Figure 9.
- This DVB-T decoder block extracts, using the PSI type information sent from the node. radio access 101 to the client equipment via the radio control interface 160, the specific program that the user has requested and that is delivered through the final equipment interface 130 to the final equipment 120.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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BR112012002201A BR112012002201A2 (pt) | 2009-07-31 | 2010-07-07 | procedimento de distribuição de sinais de audio e vídeo sem fio em interiores |
EP10803941A EP2498517A1 (en) | 2009-07-31 | 2010-07-07 | Method for distributing wireless audio and video signals indoors |
US13/388,110 US20120192236A1 (en) | 2009-07-31 | 2010-07-07 | Method for distributing wireless audio and video signals indoors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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ES200930549A ES2376213B2 (es) | 2009-07-31 | 2009-07-31 | Procedimiento de distribución de señales de audio y video inalámbricas en interiores. |
ESP200930549 | 2009-07-31 |
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WO2011012750A1 true WO2011012750A1 (es) | 2011-02-03 |
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PCT/ES2010/070469 WO2011012750A1 (es) | 2009-07-31 | 2010-07-07 | Procedimiento de distribución de señales de audio y vídeo inalámbricas en interiores |
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US (1) | US20120192236A1 (es) |
EP (1) | EP2498517A1 (es) |
AR (1) | AR077326A1 (es) |
BR (1) | BR112012002201A2 (es) |
ES (1) | ES2376213B2 (es) |
UY (1) | UY32815A (es) |
WO (1) | WO2011012750A1 (es) |
Cited By (1)
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GB2488163A (en) * | 2011-02-18 | 2012-08-22 | Sony Corp | Using Signal Parameter Estimation of a first signal type ( DVB-T2) to predict corresponding parameter values for a second signal type ( DVB-NGH) |
Families Citing this family (5)
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US8537928B2 (en) * | 2010-10-08 | 2013-09-17 | Nec Laboratories America, Inc. | Channel estimation methods and systems based on power measurement at receivers |
FR2979784A1 (fr) * | 2011-09-02 | 2013-03-08 | France Telecom | Procede de selection de canal, equipement wifi et programme d'ordinateur correspondants |
EP2800288B1 (en) * | 2013-04-30 | 2020-06-17 | Swisscom AG | System and method for selecting media feeds for playback by a media player |
WO2019114911A1 (es) | 2017-12-13 | 2019-06-20 | Fiorentino Ramon | Sistema interconectado para la transmisión inalámbrica de audio y vídeo de alta calidad entre dispositivos de electrónica de consumo |
WO2020206453A1 (en) * | 2019-04-05 | 2020-10-08 | Saldin Paul G | Integrated security system |
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EP1619911A1 (en) | 2004-07-19 | 2006-01-25 | Axalto SA | Method of obtaining and transmitting user-specific maintenance data related to radio transmission in a wireless network |
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EP1206878A1 (en) * | 1999-08-27 | 2002-05-22 | Nokia Corporation | Mobile multimedia terminal for dvb-t and large and small cell communication |
US6873835B2 (en) * | 2001-09-13 | 2005-03-29 | Symbol Technologies, Inc. | Antenna selection circuit for use in mobile computers |
KR100819493B1 (ko) * | 2001-09-28 | 2008-04-07 | 엘지전자 주식회사 | 무선랜을 이용한 엠펙 데이터 송수신 장치 |
US9042338B2 (en) * | 2007-07-09 | 2015-05-26 | Intel Mobile Communications GmbH | Communication device and method for transmitting data |
US8699444B2 (en) * | 2007-12-21 | 2014-04-15 | Apple Inc. | Broadcast system interference protection method and apparatus |
-
2009
- 2009-07-31 ES ES200930549A patent/ES2376213B2/es not_active Expired - Fee Related
-
2010
- 2010-07-07 US US13/388,110 patent/US20120192236A1/en not_active Abandoned
- 2010-07-07 BR BR112012002201A patent/BR112012002201A2/pt not_active IP Right Cessation
- 2010-07-07 WO PCT/ES2010/070469 patent/WO2011012750A1/es active Application Filing
- 2010-07-07 EP EP10803941A patent/EP2498517A1/en not_active Withdrawn
- 2010-07-20 AR ARP100102642A patent/AR077326A1/es unknown
- 2010-07-30 UY UY0001032815A patent/UY32815A/es not_active Application Discontinuation
Patent Citations (1)
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EP1619911A1 (en) | 2004-07-19 | 2006-01-25 | Axalto SA | Method of obtaining and transmitting user-specific maintenance data related to radio transmission in a wireless network |
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GB2488163A (en) * | 2011-02-18 | 2012-08-22 | Sony Corp | Using Signal Parameter Estimation of a first signal type ( DVB-T2) to predict corresponding parameter values for a second signal type ( DVB-NGH) |
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UY32815A (es) | 2011-02-28 |
ES2376213A1 (es) | 2012-03-12 |
BR112012002201A2 (pt) | 2016-05-31 |
US20120192236A1 (en) | 2012-07-26 |
AR077326A1 (es) | 2011-08-17 |
EP2498517A1 (en) | 2012-09-12 |
ES2376213B2 (es) | 2012-08-08 |
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