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METHOD AND SYSTEM FOR
DISTRIBUTION OF WIRELESS SIGNALS
FOR INCREASED WIRELESS COVERAGE
USING POWER LINES
BACKGROUND OF THE INVENTION 5
1. Field of the Invention
This invention relates to the distribution of communication signals transmitted using wireless electronic communications systems including specifically personal communications systems (PCS), cellular, and satellite communication 10 systems. More specifically, this invention relates to a distribution network, using AC power lines within a building or structure, for providing wireless communications coverage.
2. Description of Related Art
A variety of power line carrier telephone voice and/or data 15 communication systems have been developed and are used to facilitate telephonic communications in locations where little or no availability exists for dedicated telephone wires. While these devices may provide a connection to the existing power lines they do not provide a network system for 20 solving the wireless signal blockage problem within certain buildings or other structures and to distribute the wireless signal within such buildings or structures. The following United States and foreign patent documents are referred to the reader for background on power line communications 25 systems: U.S. Pat. No. 2,510,273, 2,516,211, 2,516,763, 2,535,446, 2,567,908, 2,577,731, 2,654,805, 2,820,097, 2,828,363, 2,932,794, 3,045,066, 3,280,259, 3,334,185, 3,369,078, 3,399,397, 3,400,221, 3,475,561, 3,521,267, 3,529,216, 3,659,280, 3,693,155, 3,810,096, 3,818,481, 3,846,638, 3,852,740, 3,876,984, 3,911,415, 3,922,664, 3,924,223, 3,925,763, 3,925,728, 3,942,168, 3,949,172, 3,967,264, 3,973,087, 3,980,954, 4,012,733, 4,012,734, 4,016,429, 4,057,793, 4,058,678, 4,065,763, 4,107,656, 4,161,027, 4,173,754, 4,174,517, 4,218,655, 4,222,035, 4,239,940, 4,254,403, 4,307,380, 4,321,581, 4,323,882, 4,344,066, 4,357,598, 4,371,867, 4,377,804, 4,386,436, 4,400,688, 4,408,185, 4,408,186, 4,429,299, 4,433,326, 4,442,319, 4,471,399, 4,473,817, 4,475,193, 4,479,033, 4,495,386, 4,514,594, 4,523,307, 4,535,447, 4,538,136,
4.556.864, 4,556,865, 4,556,866, 4,559,520, 4,599,598, 4,609,839, 4,611,274, 4,633,218, 4,638,298, 4,638,299,
4.641.126, 4,641,322, 4,642,607, 4,644,321, 4,675,648, 4,701,945, 4,745,391, 4,745,392, 4,746,897, 4,749,992, 4,759,016, 4,763,103, 4,772,870, 4,774,493, 4,783,780, 4,788,527, 4,809,296, 4,829,570, 4,835,517, 4,845,466, 4,847,903, 4,864,589, 4,866,733, 4,890,089, 4,912,553, 4,962,496, 4,963,853, 4,968,970, 4,988,972, 4,995,053, 5,003,457, 5,032,833, 5,049,876, 5,063,563, 5,065,133, 5,066,939, 5,136,612, 5,151,838, 5,155,466, 5,168,510,
5.187.865, 5,192,231, 5,210,518, 5,241,283, 5,257,006, 5,262,755, 5,274,699, 5,278,862, 5,289,476, 5,319,634, 5,327,230, 5,349,644, 5,351,272, 5,355,114, 5,357,541,
5.404.127, 5,406,248, 5,406,249, 5,410,292, 5,412,369, 5,424,709, 5,448,593, 5,452,344, 5,461,629, 5,463,662, 5,467,011, 5,471,190, 5,504,454, 5,530,737, 5,530,741, 5,550,905, 5,554,968, 5,559,377, 5,630,204, GB 544,243, GB 549,948, GB 553,225, GB 683,265, GB 1,393,424, GB 2,094,598, AU-Bl-12,488/76, Canada 1057436, Canada 1216689, EPO 0 078 171 A2, EPO 0 555 869 A2, PCT/ US83/01717, PCT/US90/02291, PCT/US90/06701, PCT/ US92/08510, PCT/US93/04726, PCT/US94/03110, and PCT/US95/00354 each of which is hereby incorporated by reference in its entirety for the material disclosed therein.
SUMMARY OF THE INVENTION
It is desirable to provide a method and system providing for the distribution of wireless communication signals
within a building or other structure, using standard readily available AC power lines, and to there by permit the communication channel user to use the wireless communication device with minimal signal drop-outs.
Therefore, it is the general object of this invention to provide a method and system for distributing wireless communication signals throughout a building or other structure using AC power lines.
It is a further object of this invention to provide a method and system for distributing wireless communication signals throughout a building or other structure that minimizes signal drop-outs.
It is another object of this invention to provide a method and system for distributing wireless communication signals throughout a building or other structure that minimizes installation and maintenance cost.
A further object of this invention is to provide a method and system for distributing wireless communication signals throughout a building or other structure that is reliable in operation.
Another object of this invention is to provide a method and system for distributing wireless communication signals throughout a building or other structure that is compatible with standard personal communication systems (PCS's).
A still further object of this invention is to provide a method and system for distributing wireless communication signals throughout a building or other structure that is compatible with cellular telephone systems.
It is a further object of this invention to provide a method and system for distributing wireless communication signals throughout a building or other structure that is compatible with satellite communication systems.
It is still another object of this invention to provide a method for receiving wireless communication signals and distributing such signals over AC power lines within a building or other structure.
These and other objects of this invention are intended to be covered by this disclosure and are readily apparent to individuals of ordinary skill in the art upon review of the following drawings, detailed description and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a representative drawing of the principle components of the preferred embodiment of this invention.
FIG. 2 depicts additional detail of the external conversion module of the preferred embodiment of the invention.
FIG. 3 depicts additional detail of the internal conversion module of the preferred embodiment of the invention.
FIG. 4 depicts an overview drawing of the system of the preferred embodiment of the invention.
FIG. 5 depicts a flow chart showing the steps of the preferred method of this invention.
DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT OF THE
INVENTION
This invention is a method and system for providing a communications distribution network using A/C power lines that is compatible with standard wireless communication devices such as personal communications systems (PCS), cellular, and satellite communication devices, and which addresses the problem of signal distortion and/or blockage common within certain buildings or other structures. In particular, the system of this invention comprises a radio
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frequency (RF) interface unit, a power line carrier (PLC) base unit, a PLC extension unit, and an RF conversion unit. These devices which are connected electronically, generally and preferably using existing AC power lines where ever possible. The method of this invention provides the preferred processing and communication steps used in the system of this invention to provide the distribution of the signals throughout the building or structure.
FIG. 1 shows a representative drawing of the principle components of the preferred embodiment of this invention in its preferred system configuration. Typically this invention operates within or in close proximity to a building or other structure 101. When receiving a signal from outside the building 101, the communication signal is first received by the External Conversion Module 102 via a standard communications antenna 109. Within the External Conversion Module 102 are two major units, the RF Interface Unit 103 and the PLC Base Unit 104. The RF Interface Unit 103 is electrically connected to the external antenna 109. Signals received by the RF Interface Unit 103, via the external antenna 109, are down converted to a baseband or low carrier frequency by the RF Interface Unit 103. The RF Interface Unit 103 next formats the resulting signal, which may be a voice, data, video, multi-media and/or control signal, and transmits the formatted signal to the PLC Base Unit 104 via a standard electrical connection. The PLC Base Unit 104 processes the received formatted signal and sends the processed signal over the existing AC power lines. Alternatively, the processed signal can be sent using analog techniques or it can be digitized and sent using a digital data link or, alternatively, it can be sent using spread spectrum techniques. Typically and preferably the PLC Base Unit 104 is connected to the AC power lines simply by being plugged into a standard two or three prong AC power outlet, although alternative direct wire connections are also supported by this invention. The signals being communicated over the AC power lines are received by the Internal Conversion Module
105, which is preferably includes a PLC Extension Unit 106 and an RF Conversion Unit 107. The PLC Extension Unit
106, connected directly to an AC power line, receives the signal from the PLC Base Unit 104 and communicates the signal over a standard electrical connection to the RF Conversion Unit 107. The RF Conversion Unit 107 formats the signal for standard typical wireless telephone or other communication equipment 108, unconverts it and transmits the data or information on the signal to the wireless telephone equipment 108 via an antenna 111 to antenna 110 channel.
Alternatively, when a user wishes to send a signal from the wireless telephone equipment 110 within the building 101 the reverse communications path is followed. The signal is generated by the standard wireless telephone or other communication equipment 108 and is transmitted antenna 110 to antenna 111 to the RF Conversion Unit 107 of the Internal Conversion Module 105. The RF Conversion Unit 107 processes, or down-converts, the signal for use by the PLC Extension Unit 106, which receives the processed signal across an electrical connection. The PLC Extension Unit 106 formats the signal and imposes it on the AC power line. Typically the PLC Extension Unit 106 is connected to the AC power line via a standard two or three prong plug, although alternative direct wire connections can also be supported by this invention. The PLC Base Unit 104, of the External Conversion Module 102, receives the signal across the AC power line and processes it for communication with the RF Interface Unit 103 which in turn up converts the signal for transmission via the antenna 109 to the outside
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receiver. This system provides significantly improved signal quality, signal to noise ration, and avoids blank spots to wireless communication inside buildings or other structures. FIG. 2 shows the additional detail of the external conver
5 sion module 102 of the preferred embodiment of the invention, in particular this figure provides detail concerning the sub-components of the preferred embodiment of the external conversion module 102. The signal received by the antenna 109 is communicated to the RF Interface Unit 103
10 as described above. The preferred embodiment of the RF Interface Unit 103 consists of three modules: the RF Demodulator 201; the Detector and Data Processor 202; and the Data Format and Interface 203. The RF Demodulator 201 receives the RF signal, which originated from a PCS,
15 Cellular, brig Satellite or other similar communication source and demodulates the RF information, processing it appropriate to the source and type of RF signal received. Such processing step is well known in the art of receivers common to each type of communication device. The RF
20 Demodulator 201 then communicates electronically the resulting processed signal to the Detector and Data Processor 202, where the information is detected on the signal carrier, processed and electronically sent to the Data Format and Interface 203. The Data Format and Interface 203
25 prepares the data in the correct format for the Powerline Carrier (PLC) Base Unit 104. Typically and preferably the RF Interface Unit 103 and the PLC Base Unit 104 communicate electronically over an industry standard conductor 208. The PLC Base Unit 104 is preferably comprised of
30 three modules: the Interface 204; the Data Processor and Modulator 205; and the Power Line Interface 206. The Interface 204 module receives the data from the Data Format and Interface 203 and send the data to the Data Processor and Modulator 205 where the data is modulated and for
35 matted for transmission over the AC power lines. The Power Line Interface 206 provides power to the External Conversion Module 102 as well as interfaces the data from the Data Processor and Modulator 205 to the AC power lines 207. Typically, the connection between the Power Line Interface
40 206 and the AC power lines 207 is accomplished through a standard two or three prong AC outlet and plug combination, although alternative direct connections to AC power are also contemplated as functionally equivalent and within the scope of this invention.
45 FIG. 3 shows additional detail of the Internal Conversion module 105 of the preferred embodiment of the invention, in particular, this figure provides detail concerning the subcomponents of the preferred embodiment of the Internal Conversion module 105. The preferred Internal Conversion
50 module 105 consists of a Power Line Carrier (PLC) Extension Unit 106 and a RF Conversion Unit 107. The preferred PLC Extension Unit 106 consists of three modules: Power Line Interface 301; Data Processor and Modulator 302; and RF Interface 303. The AC power line 307 carrying the data
55 from the Power Line Interface 206 of the PLC Base Unit 104 is connected, preferably and typically via a standard AC wall outlet and two or three prong plug, to the Power Line Interface 301 of the PLC Extension Unit 106. The Power Line Interface 301 not only receives the information from
60 the AC power line connection 307 but it also provides power to the Internal Conversion Module 105. The data received by the Power Line Interface 301 is passed along to the Data Processor and Modulator 302 which processes the data, modulating it for use by the RF Interface 303. The RF
65 Interface 303 provides the appropriate electrical interface for the RF Conversion Unit 107. Typically and preferably, the RF Interface 303 communicates with the RF Conversion
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