Wireless communication subsystem with a digital interface
Systems and methods are disclosed which provide wireless communication systems implementing subsystems adapted for flexible deployment configurations and to resist the introduction of interference. Preferred embodiments of the present invention provide a wireless communication system configuration in which an ODU subsystem is coupled to an IDU subsystem using a fiber optic link. According to a preferred embodiment of the present invention, an ODU subsystem is adapted to provide conversion between digital and analog to thereby facilitate the use of a digital link between the ODU subsystem and a corresponding IDU subsystem. Embodiments of the present invention utilize a plurality of ODU subsystems configured according to the present invention to provide wireless communication coverage of a service area, such as to provide a wireless application termination system (WATS) hub for use in providing wireless communication links with respect to a plurality of subscriber units.
1. A wireless communication method, the method comprising:
receiving, at an indoor unit at a subscriber location, first data over a first broadband digital interface, the first broadband digital interface comprising a fiber optic cable from a first outdoor unit located at a first location that receives first wireless signals and performs analog signal processing associated with the received first wireless signals;
performing, at the indoor unit, digital signal processing on the received first data;
transmitting, from the indoor unit, first subscriber data comprising Ethernet data over at least one Ethernet interface to at least one of a plurality of first local subscribers;
receiving, at the indoor unit, second data over a second broadband digital interface, the second broadband digital interface comprising a fiber optic cable from a second outdoor unit located at a second location that receives second wireless signals and performs analog signal processing associated with the second received wireless signals;
performing, at the indoor unit, digital signal processing on the received second data; and
transmitting, from the indoor unit, second subscriber data comprising Ethernet data over the at least one Ethernet interface to at least another of a plurality of second local subscribers;
where the first outdoor unit is adapted to transmit and receive first digital subscriber data over the first broadband digital interface and the second outdoor unit is adapted to transmit and receive second digital subscriber data over the second broadband digital interface with the indoor unit;
where the first outdoor unit transmits information comprising routing or switching information to the second outdoor unit.
2. The wireless communication method of claim 1 where transmitting from the indoor unit further comprises:
simultaneously transmitting timing bits with the Ethernet data.
3. The wireless communication method of claim 1 further comprising:
synchronizing the data reception at the indoor unit using a timing circuitry, wherein a portion of the first data includes control data.
4. The wireless communication method of claim 1 wherein at least one of the first and second broadband digital interfaces of the indoor unit comprise multi-port data routing functionality.
5. The wireless communication method of claim 1 wherein the broadband digital interfaces of the indoor unit comprise multi-port switching functionality.
6. The wireless communication method of claim 1 further comprising:
coupling an OFDM digital modem to the broadband digital interfaces of the indoor unit;
coupling a digital multiplexer to the OFDM digital modem; and
coupling the broadband digital interfaces to the digital multiplexer.
7. The wireless communication method of claim 1 , wherein the indoor unit is configured to perform digital signal processing but not analog signal processing.
8. The wireless communication method of claim 1 further comprising:
communicating digital subscriber data between the indoor unit and the outdoor unit, wherein the digital subscriber data comprises digital control and timing data.
9. The wireless communication method of claim 8 , further comprising: communicating the digital subscriber data to a wireless interface of the first and second outdoor units.
10. The wireless communication method of claim 1 , wherein the broadband digital interfaces comprise a fiber optic ring architecture.
11. A wireless communication system, the system comprising:
an indoor unit at a subscriber location comprising:
a first broadband digital interface comprising a fiber optic cable, the first broadband digital interface receiving first data from a first outdoor unit located at a first location, where the received first data has gone through analog signal processing performed by the first outdoor unit;
a second broadband digital interface comprising a fiber optic cable, the second broadband digital interface receiving second data from a second outdoor unit located at a second location, where the second received data has gone through analog signal processing performed by the second outdoor unit;
digital signal processing circuitry to perform signal processing on the data received from the first outdoor unit and the second outdoor unit; and
at least one Ethernet interface to transmit, from the indoor unit, first subscriber data comprising Ethernet data to at least a plurality of first local subscribers and a plurality of second local subscribers;
where the first outdoor unit is adapted to transmit and receive first digital subscriber data over the first broadband digital interface and the second outdoor unit is adapted to transmit and receive second digital subscriber data over the second broadband digital interface with the indoor unit;
where the first outdoor unit transmits information comprising routing or switching information to the second outdoor unit.
12. The wireless communication system of claim 11 where the at least one Ethernet interface also simultaneously transmits timing bits with first and second Ethernet data.
13. The wireless communication system of claim 11 further comprising:
a timing circuitry to synchronize a digital communication between the indoor unit, wherein a portion of the digital communication includes control data.
14. The wireless communication system of claim 11 wherein the broadband digital interfaces of the indoor unit comprise multi-port data routing functionality.
15. The wireless communication system of claim 11 wherein the broadband digital interfaces of the indoor unit comprise multi-port switching functionality.
16. The wireless communication system of claim 11 wherein the indoor unit comprises:
an OFDM digital modem coupled to the broadband digital interfaces of the indoor unit;
a digital multiplexer coupled to the OFDM digital modem; and
wherein the broadband digital interfaces are coupled to the digital multiplexer.
17. The wireless communication system of claim 11 , wherein the indoor unit is adapted to perform digital signal processing but not analog signal processing.
18. The wireless communication system of claim 11 , wherein the indoor unit is adapted to communicate digital subscriber data to the first and second outdoor units, and wherein the digital subscriber data comprises digital control and timing data.
19. The wireless communication system of claim 11 , further configured to communicate the digital subscriber data to a wireless interface of the first and second outdoor units.
20. The wireless communication system of claim 19 wherein the first and second outdoor units comprise:
a frequency converter coupled to the wireless interface to convert carrier frequency between an intermediate frequency and a radio frequency;
a digital to analog circuitry coupled to the frequency converter and a digital multiplexer;
an analog to digital circuitry coupled to the frequency converter and the digital multiplexer; and
a digital interface coupled to the digital multiplexer.
21. The wireless communication system of claim 11 , wherein the broadband digital interfaces comprise a fiber optic ring architecture.