Wavefront multiplexing in passive optical network with remote digital beam forming
First Claim
1. A communications system comprising:
- a remote beam forming network (RBFN) at a transmission end;
RF antenna elements at a reception end; and
an optical fiber segment with N active optical channels coupling the RBFN at the transmission end to N of the RF antenna elements at the reception end, where N is an integer and N≧
2, the optical fiber segment comprising;
a preprocessor at the transmission end adapted to perform N-to-N K-multiplexing functions, the preprocessor having N input ports and N output ports, the N input ports receiving M data input signals and P pilot signals, where N, M, and P are integers, N>
M>
1, and P is less than or equal to N minus M, the N output ports concurrently outputting N output signals, each of the N output signals being a linear combination of the M data input signals and the P pilot signals; and
a post-processor at the reception end adapted to perform N-to-N K-demultiplexing functions, the N-to-N K-demultiplexing functions being the inverse of the N-to-N K-multiplexing functions.
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Abstract
Four independent technologies are incorporated in this invention to efficiently and cost effectively implement dynamic last mile connectivity. The four technologies are passive optical networks (PON), Small cell, wavefront multiplexing (or K-muxing), and digital beam forming (DBF). We have filed US patents for communications architectures featuring K-muxing overlaid over low cost of PON. Those inventions relate particularly to resource allocation in passive optical networks (PON) via wavefront multiplexing (WF-muxing or K-muxing) and wavefront demultiplexing (WF-demuxing or K-demuxing). The “WF-muxing in PON” can be configured for performing remote digital beam forming (RDBF) over a service area covered by multiple small cells. The RDBF may generate multiple shaped beams with enhanced connectivity and better isolations over a same frequency slot concurrently to serve multiple users over the coverage area.
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Citations
18 Claims
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1. A communications system comprising:
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a remote beam forming network (RBFN) at a transmission end; RF antenna elements at a reception end; and an optical fiber segment with N active optical channels coupling the RBFN at the transmission end to N of the RF antenna elements at the reception end, where N is an integer and N≧
2, the optical fiber segment comprising;a preprocessor at the transmission end adapted to perform N-to-N K-multiplexing functions, the preprocessor having N input ports and N output ports, the N input ports receiving M data input signals and P pilot signals, where N, M, and P are integers, N>
M>
1, and P is less than or equal to N minus M, the N output ports concurrently outputting N output signals, each of the N output signals being a linear combination of the M data input signals and the P pilot signals; anda post-processor at the reception end adapted to perform N-to-N K-demultiplexing functions, the N-to-N K-demultiplexing functions being the inverse of the N-to-N K-multiplexing functions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A communications system comprising:
an optical fiber segment with active optical channels coupling a first data stream and a second data stream at a transmission end to a first input and a second input of a beam forming network (BFN) with RF antenna elements at a reception end, wherein the first input to the BFN is configured to cover a first user region and the second input to the BFN is configured to cover a second user region, the optical fiber segment comprising; a preprocessor at the transmission end adapted to perform N-to-N K-multiplexing functions, the preprocessor having N input ports and N output ports, the N input ports receiving M data input signals and P pilot signals, where N, M, and P are integers, N>
M>
1, and P is less than or equal to N minus M, the N output ports concurrently outputting N output signals, each of the N output signals being a linear combination of the M data input signals and the P pilot signals; anda post-processor at the reception end adapted to perform N-to-N K-demultiplexing functions, the N-to-N K-demultiplexing functions being the inverse of the N-to-N K-multiplexing functions. - View Dependent Claims (13, 14, 15, 16, 17, 18)
Specification