APPARATUS AND METHOD FOR TRANSFERRING SIGNALS BETWEEN A FIBER NETWORK AND A WIRELESS NETWORK ANTENNA

• US 20070019959A1
• Filed: 05/15/2006
• Published: 01/25/2007
• Est. Priority Date: 07/19/2005
• Status: Abandoned Application

• Current Assignee: Logus Broadband Wireless Solutions Incorporated
• Original Assignee: Logus Broadband Wireless Solutions Incorporated
• Inventors: Retnasothie, Dashaini, Muthulingam, Sugunalan, Retnasothie, Francis
• Application Number:
  US11/383,270
• Publication Number:
  US 20070019959A1
• Time in Patent Office: Days
• US Class Current: 398/115
• CPC Class Codes: H04B 10/25752 Optical arrangements for wireless networks

Abstract

An apparatus and method transfers signals between a fiber network and a wireless network antenna. In a fiber to wireless stage, fiber signals are optically transferred from the fiber network and converted into RF signals compatible with the DOCSIS interface standard. The RF signals are electronically converted into data packets, the data packets are electronically converted into baseband digital signals, and the digital signals are converted into analog signals, before being transferred to the network antenna for wireless transmission. The data packets, digital signals, and analog signals are compatible with the IEEE 802.l6 wireless networking standard. Conversely, in a wireless to fiber stage, the analog signals are transferred from the antenna, and converted into digital signals, which are then electronically converted into data packets. The data packets are electronically converted into RF signals, which are next converted into fiber signals, before being optically transferred to the fiber network.

Claims

1. An apparatus for transferring signals between a fiber network and a wireless network antenna, with the fiber network including fiber optic cables and utility poles, said apparatus comprising:

a) a fiber module adapted to be operatively coupled to the fiber network so as to enable transfer of fiber signals to and from the fiber network, with said fiber module comprising a fiber module conversion means for converting between said fiber signals and RF signals in a bidirectional radio frequency format compatible with the DOCSIS interface standard;

b) a RF/packet converter in RF communicating relation with said fiber module so as to enable bidirectional transfer of said RF signals to and from said fiber module, with said RF/packet converter comprising at least one signal processor adapted to convert between said RF signals and data packets in a packet format compatible with the IEEE 802.16 wireless networking standard;

c) a WIMAX media access control layer in packet communicating relation with said RF/packet converter so as to enable transfer of said data packets to and from said RF/packet converter, with said media access control layer comprising at least one WIMAX MAC processor adapted to bidirectionally convert between said data packets and bit stream signals in a bit stream format compatible with the IEEE 802.16 wireless networking standard;

d) a baseband physical layer in bit stream communicating relation with said media access control layer so as to enable operative transfer of said bit stream signals to and from said media access control layer, with said baseband physical layer comprising a PHY processor adapted to bidirectionally convert between said bit stream signals and baseband digital signals in a baseband digital format compatible with the IEEE 802.16 wireless networking standard; and

e) a radio module in baseband digital communicating relation with said baseband physical layer so as to enable transfer of said baseband digital signals to and from said baseband physical layer, with said radio module comprising a radio module conversion means for converting between said baseband digital signals and analog signals in an analog format compatible with the IEEE 802.16 wireless networking standard, with said radio module adapted to be operatively coupled to the wireless network antenna so as to enable transfer of said analog signals to and from the wireless network antenna;

wherein said apparatus operatively transfers signals between the fiber network and the wireless network antenna in a fiber to wireless stage and in a wireless to fiber stage;

wherein, in the fiber to wireless stage, said fiber module transfers said fiber signals from the fiber network, said fiber module conversion means converts said fiber signals into said RF signals, said RF/packet converter transfers said RF signals from said fiber module, said at least one signal processor converts said RF signals into said data packets, said WIMAX media access control layer transfers said data packets from said RF/packet converter, said at least one WIMAX MAC processor converts said data packets into said bit stream signals, said baseband physical layer transfers said bit stream signals from said media access control layer, said PHY processor converts said bit stream signals into said baseband digital signals, said radio module transfers said baseband digital signals from said baseband physical layer, said radio module conversion means converts said baseband digital signals into said analog signals, and said radio module transfers said analog signals to the wireless network antenna for transmission according to the IEEE 802.16 wireless networking standard; and

wherein, in the wireless to fiber stage, said radio module transfers said analog signals from the wireless network antenna according to the IEEE 802.16 wireless networking standard, said radio module conversion means converts said analog signals into said baseband digital signals, said radio module transfers said baseband digital signals to said baseband physical layer, said PHY processor converts said baseband digital signals into said bit stream signals and said baseband physical layer transfers said bit stream signals to said WIMAX media access control layers said at least one WIMAX MAC processor converts said bit stream signals into said data packets and said WIMAX media access control layer transfers said data packets to said RF/packet converter, said at least one signal processor converts said data packets into said RF signals, said RF/packet converter transfers said RF signals to said fiber module, said fiber module conversion means converts said RF signals into said fiber signals, and said fiber module transfers said fiber signals to the fiber network.

2. An apparatus according to claim 1, wherein said at least one signal processor of said RF/packet converter comprises:

a) a DOCSIS/Ethernet converter in said RF communicating relation with said fiber module, with said DOCSIS/Ethernet converter adapted to convert between said RF signals and Ethernet signals in a bidirectional interface format compatible with the IEEE 802.3 standard; and

b) an Ethernet MAC processor in Ethernet communicating relation with said DOCSIS/Ethernet converter so as to enable operative bidirectional transfer of said Ethernet signals to and from said DOCSIS/Ethernet converter, with said Ethernet MAC processor adapted to convert between said Ethernet signals and said data packets in said packet format;

wherein, in the fiber to wireless stage, said DOCSIS/Ethernet converter transfers said RF signals from said fiber module and converts said RF signals into said Ethernet signals, said Ethernet MAC processor transfers said Ethernet signals from said DOCSIS/Ethernet converter and converts said Ethernet signals into said data packets, and said WiMAX media access control layer transfers said data packets from said Etherntet MAC processor; and

wherein, in the wireless to fiber stage, said WIMAX media access control layer transfers said data packets to said Ethernet MAC processor, said Ethernet MAC processor converts said data packets into said Ethernet signals and transfers said Ethernet signals to said DOCSIS/Ethernet converter, and said DOCSIS/Ethernet converter converts said Ethernet signals into said RF signals and transfers said RF signals to said fiber modules.

3. An apparatus according to claim 2, wherein said RF/packet converter, said WIMAX media access control layer, and said baseband physical layer are together formed on a single circuit board.

4. An apparatus according to claim 3, wherein said RF/packet converter, WIMAX media access control layer, and said baseband physical layer are together integrated into a single integrated circuit on said circuit board.

5. An apparatus according to claim 3, further comprising an enclosure, with said fiber module, said RF/packet converter, said WIMAX media access control layer, said baseband physical layer, and said radio module being together contained within said enclosure.

6. An apparatus according to claim 5, wherein said enclosure is a rugged enclosure adapted for outdoor use so as to substantially protect said fiber module, said RF/packet converter, said WIMAX media access control layer, said baseband physical layer, and said radio module from outside environmental conditions.

7. An apparatus according to claim 6, wherein said fiber module is further adapted to be operatively coupled to at least one of the fiber optic cables of the fiber network, and wherein said rugged enclosure is provided with suspension means for suspending said enclosure from a supporting member selected from said utility poles and said fiber optic cables.

8. An apparatus according to claim 5, wherein said enclosure is a rugged enclosure having a rigid watertight shell so as to substantially protect said fiber module, said RF/packet converter, said WIMAX media access control layer, said baseband physical layer, and said radio module from outside underground conditions.

9. An apparatus according to claim 2, wherein said WIMAX media access control layer and said baseband physical layer are together formed on a single circuit board.

10. An apparatus according to claim 9, wherein said WIMAX media access control layer and said baseband physical layer are together integrated into a single integrated circuit on said circuit board.

11. An apparatus according to claim 9, further comprising an enclosure, with said WIMAX media access control layer, said baseband physical layer, and said radio module being together contained within said enclosure.

12. An apparatus according to claim 1, wherein said fiber module further comprises a RF diplexer having a transmission path, a reception path, and a combined signal path in said RF communicating relation with said RF/packet converter, and wherein said fiber module conversion means comprises,

a) a RF transmitting module coupled to said transmission path of said RF diplexer, with said RF transmitting module being adapted to be operatively coupled to the fiber network, wherein in, said fiber to wireless stage, said RF transmitting module transfers said fiber signals from the fiber network, converts said fiber signals into said RF signals, and transmits said RF signals to said transmission path of said RF diplexer, with said RF diplexer transmitting said RF signals along said combined signal path to said RF/packet converter;

and

b) a RF receiving module coupled to said reception path of said RF diplexer, with said RF receiving module being adapted to be operatively coupled to the fiber network, wherein in said wireless to fiber stage, said RF/packet converter transmits said RF signals to said combined signal path of said RF diplexer, said RF diplexer transmits said RF signals along said reception path to said RF receiving module, said RF receiving module converts said RF signals into said fiber signals, and transfers said fiber signals to the fiber network.

13. An apparatus according to claim 12, wherein said transmission path of said RF diplexer comprises a high frequency band transmission path, and said reception path comprises a low frequency band reception path.

14. An apparatus according to claim 12, wherein said RF transmitting module comprises an optical receiving diode adapted to be optically coupled, to the fiber network so as to enable said transfer of said fiber signals from the fiber network in said fiber to wireless stage.

15. An apparatus according to claim 14, wherein said RF transmitting module further comprises a band pass filter coupled to a diode output path of said optical receiving diode, a first amplifier coupled to a filtered output path of said band pass filter, an attenuator coupled to a first amplified output path of said first amplifier, and a second amplifier coupled to an attenuated output path of said attenuator, with said transmission path of said RF diplexer coupled to a second amplified output path of said second amplifier so as to enable said transmission of said RF signals from said RF transmitting module to said RF/packet converter in said fiber to wireless stage.

16. An apparatus according to claim 15, wherein said RF transmitting module further comprises an unequal splitter in substantially juxtaposed relation between said RF diplexer and said second amplified output path of said second amplifier, with said unequal splitter providing a test point so as to enable testing of said RF transmitting module.

17. An apparatus according to claim 12, wherein said RF receiving module comprises an optical transmitting diode adapted to be optically coupled to the fiber network so as to enable said transfer of said fiber signals to the fiber network in said wireless to fiber stage.

18. An apparatus according to claim 17, wherein said RF receiving module further comprises a first attenuator coupled to said reception path of said RF diplexer so as to enable said reception by said RF receiving module of said RF signals from said RF/packet converter in said wireless to fiber stage, an amplifier coupled to a first attenuated output path of said first attenuator, and a second attenuator coupled to an amplified output path of said amplifier, with said optical transmitting diode coupled to a second attenuated output path of said second attenuator.

19. An apparatus according to claim 1, wherein said radio module conversion means comprises:

a) a radio transmitting module coupled to said baseband physical layer in said baseband digital communicating relation, with said radio transmitting module being adapted to be operatively coupled to the wireless network antenna, wherein in the fiber to wireless stage, said radio transmitting module transfers said baseband digital signals from said baseband physical layer, converts said baseband digital signals into said analog signals, and transfers said analog signals to the wireless network antenna; and

b) a radio receiving module coupled to said baseband physical layer in said baseband digital communicating relation, with said radio receiving module being adapted to be operatively coupled to the wireless network antenna, wherein in said wireless to fiber stage, said radio receiving module transfers said analog signals from the wireless network antenna, converts said analog signals into said baseband digital signals, and transfers said baseband digital signals to said baseband physical layer.

20. An apparatus according to claim 19, wherein at least one of said radio transmitting module and said radio receiving module is embodied in a software defined radio.

21. An apparatus according to claim 20, wherein both of said radio transmitting module and said radio receiving module are embodied in said software defined radio.

22. An apparatus according to claim 19, wherein said radio module further comprises an antenna diplexer/switch having a transmission path, a reception path, and a combined signal path adapted to be operatively coupled to the wireless network antenna, with said radio transmitting module coupled to said transmission path of said antenna diplexer/switch for operative transfer of said analog signals to the wireless network antenna in said fiber to wireless stage, and with said radio receiving module coupled to said reception path of said antenna diplexer/switch for transfer of said analog signals from the wireless network antenna in said wireless to fiber stage.

23. An apparatus according to claim 22, wherein said radio transmitting module comprises a digital to analog converter coupled to said baseband physical layer in said baseband digital communicating relations a first oscillating signal mixer coupled to a converted output path of said digital to analog converter, a first amplifier coupled to a first mixed output path of said first oscillating signal mixer, a band pass filter coupled to a first amplified output path of said first amplifier, a second oscillating mixer coupled to a filtered output path of said band pass filter, and a power amplifier coupled to a second mixed output path of said second oscillating mixer, with said transmission path of said antenna diplexer/switch coupled to a power amplified output path of said power amplifier so as to enable said transfer of said analog signals to the wireless network antenna in said fiber to wireless stage.

24. An apparatus according to claim 22, wherein said radio receiving module comprises a first band pass filter coupled to said reception path of said antenna diplexer/switch so as to enable said transfer of said analog signals from the wireless network antenna, a low noise amplifier coupled to a first filtered output path of said first band pass filter, a first oscillating mixer coupled to a low noise amplified output path of said low noise amplifier, a second band pass filter coupled to a first mixed output path of said first oscillating mixer, a second amplifier coupled to a second filtered output path of said second band pass filter, a second oscillating mixer coupled to a second amplified output path of said second amplifier, and an analog to digital converter coupled to a second mixed output path of said second oscillating mixer, with said analog to digital converter coupled to said baseband physical layer in said baseband digital communicating relation so as to enable said transfer of said baseband digital signals to said baseband physical layer in said wireless to fiber stage.

25. A method of transferring signals between a fiber network and a wireless network antenna, said method comprising the steps of:

a) optically transferring fiber signals to and from the fiber network;

b) converting between said fiber signals and RF signals in a bidirectional radio frequency format compatible with the DOCSIS interface standard;

c) electronically converting between said RF signals and data packets in a packet format compatible with the IEEE 802.16 wireless networking standard;

d) electronically converting between said data packets and baseband digital signals in a baseband digital format compatible with the IEEE 802.16 wireless networking standard;

e) converting between said baseband digital signals and analog signals in an analog format compatible with the IEEE 802.16 wireless networking standard; and

f) transferring said analog signals to and from the wireless network antenna;

wherein, in an operative fiber to wireless stage, said fiber signals are optically transferred from the fiber network, said fiber signals are converted into said RF signals, said RF signals are electronically converted into said data packets, said data packets are electronically converted into said baseband digital signals, said baseband digital signals are converted into said analog signals, and said analog signals are transferred to the wireless network antenna for transmission according to the IEEE 802.16 wireless networking standard; and

wherein, in an operative wireless to fiber stage, said analog signals are transferred from the wireless network antenna according to the IEEE 802.16 wireless networking standard, said analog signals are converted into said baseband digital signals, said baseband digital signals are electronically converted into said data packets, said data packets are electronically converted into said RF signals, said RF signals are converted into said fiber signals, and said fiber signals are optically transferred to the fiber networked.

26. A method according to claim 25, wherein step (c) comprises the steps of:

c.1) electronically converting between said RF signals and Ethernet signals in a bidirectional interface format compatible with the IEEE 802.3 standard; and

c.2) electronically converting between said Ethernet signals and said data packets in said packet format;

such that, in said, operative fiber to wireless stage, said RF signals are converted into said Ethernet signals, and said Ethernet signals are converted into said data packets, before said data packets are electronically converted into said baseband digital signals; and

such that, in said operative wireless to fiber stage, said data packets are converted into said Ethernet signals, and said Ethernet signals are converted into said RF signals, before said RF signals are converted into said fiber signals.

27. A method according to claim 26, wherein steps (c) and (d) are together performed by a single circuit board.

28. A method according to claim 27, wherein stems (c) and (d) are together performed by a single integrated circuit on said circuit board.

29. A method according to claim 27, wherein steps (b), (c), (d) and (e) are together performed within a single rugged enclosure that is substantially isolated from environmental conditions.

30. A method according to claim 29, wherein, in step (a), optical diodes optically transfer said fiber signals to and from the fiber network, and wherein, before step (a), said method comprises additional steps of:

i) optically coupling said optical diodes to at least one fiber optic cable of the fiber network; and

ii) suspending said enclosure from at least one supporting member selected from the group consisting of a utility pole and said at least one fiber optic cable.

31. A method according to claim 27, wherein steps (b), (c), (d) and (e) are together performed within a rigid watertight enclosing shell of a single rugged enclosure.

32. A method according to claim 26, wherein steps (c.2) and (d) are together performed by a single circuit board.

33. A method according to claim 32, wherein steps (c.2) and (d) are together performed by a single integrated circuit on said circuit board.

34. A method according to claim 32, wherein steps (c.2), (d), and (e) are together performed within a single enclosure.

35. A method according to claim 25, wherein, in step (c), a RF/packet converter electronically converts between said RF signals and said data packets;

wherein in step (b), a RF diplexer having a transmission path, a reception path, and a combined signal path bidirectionally transfers said RF signals over said combined signal path to and from said RF/packet converter according to the DOCSIS interface standard.

36. An apparatus according to claim 25, wherein, in step (c), a RF/packet converter electronically converts between said RF signals and said data packets;

wherein, in step (b), a RF diplexer having a high frequency band transmission path, a low frequency band reception path, and a combined signal path bidirectionally transfers said RF signals over said combined signal path to and from said RF/packet converter according to the DOCSIS interface standard.

37. A method according to claim 35, wherein, in step (a), a RF transmitting module transfers said fiber signals from the fiber network in said fiber to wireless stage;

wherein, in step (b), said RF transmitting module converts said fiber signals into said RF signals in said fiber to wireless stage; and

wherein, in step (b), said RF transmitting module is coupled to said transmission path of said RF diplexer for transmission of said RF signals to said RF/packet converter in said fiber to wireless stage.

38. A method according to claim 37, wherein said RF transmitting module comprises an optical diode;

wherein, in step (a), said optical diode optically transfers said fiber signals from the fiber network in said fiber to wireless stage; and

wherein, before step (a), said method comprises a further step of (i) optically coupling said optical diode to a fiber optic cable of the fiber network.

39. A method according to claim 38, wherein, in step (b), said RF signals are successively filtered, amplified, attenuated, and re-amplified within said RF transmitting module before being transmitted to said transmission path of said RF diplexer, and before transmission of said RF signals to said RF/packet converter in said fiber to wireless stage.

40. A method according to claim 35, wherein, in step (b), a RF receiving module is coupled to said reception path of said RF diplexer for reception of said RF signals from said RF/packet converter in said wireless to fiber stage;

wherein, in step (b), said RF receiving module converts said RF signals into said fiber signals in said wireless to fiber stage; and

wherein, in step (a), said RF receiving module transfers said fiber signals to the fiber network in said wireless to fiber stage.

41. A method according to claim 36, wherein, in step (a), an optical diode of said RF receiving module optically transfers said fiber signals to the fiber network in said wireless to fiber stage;

and wherein, before step (a), said method comprises a further step of (i) optically coupling said optical diode to a fiber optic cable of the fiber network.

42. A method according to claim 41, wherein, in step (b), said RF signals are successively attenuated, amplified, and re-attenuated within said RF receiving module before being converted into said fiber signals and transferred to the fiber network by said optical diode in said wireless to fiber stages.

43. A method according to claim 25, wherein, in step (f), an antenna diplexer/switch having a transmission paths a reception path, and a combined signal path bidirectionally transfers said analog signals over said combined signal path to and from the wireless network antenna.

44. A method according to claim 43, wherein, in step (d), a PHY processor electronically converts said data packets into said baseband digital signals;

wherein, in step (e), a radio transmitting module receives said baseband digital signals from said PHY processor in said fiber to wireless stage, and converts said baseband digital signals into said analog signals; and

wherein, in step (e), said radio transmitting module transfers said analog signals to said transmission path of said antenna diplexer/switch for transfer, in step (f), to the wireless network antenna in said fiber to wireless stage.

45. A method according to claim 44, wherein, in step (e), said baseband digital signals are converted into said analog signals, and said analog signals are successively mixed with a first oscillating signal, amplified, band pass filtered, re-mixed with a second oscillating signal, and power amplified within said radio transmitting module before being transferred to said transmission path of said antenna diplexer/switch in said fiber to wireless stage.

46. A method according to claim 43, wherein, in step (f), said analog signals are transferred, in said wireless to fiber stage, from the wireless network antenna to said combined signal path of said antenna diplexer/switch;

wherein, in step (e), a radio receiving module transfers said analog signals from said reception path of antenna diplexer/switch in said wireless to fiber stage;

wherein, in step (e), said radio transmitting module converts said analog signals into said baseband digital signals in said wireless to fiber stage, and transfers said baseband digital signals to a PHY processor; and

wherein, in step (d), said PHY processor electronically converts said baseband digital signals into said data packets.

47. A method according to claim 46, wherein, in step (e), said analog signals are transferred, in said wireless to fiber stage, from said reception path of said antenna diplexer/switch to said radio receiving module, and said analog signals are successively filtered through a first band pass filter, low noise amplified, mixed with a first oscillating signal, re-filtered through a second band pass filter, re-amplified, and re-mixed with a second oscillating signal, before being converted into said baseband digital signals within said radio receiving module in said fiber to wireless stages.