Distributed antenna system for MIMO technologies
First Claim
1. A distributed antenna system for distributing MIMO signals for at least one MIMO service in a distributed antenna system (DAS), comprising:
- a) at least one antenna unit operatively coupled to at least two MIMO antennas, wherein the at least one antenna unit is configured to;
receive native frequency MIMO uplink signals of at least one MIMO service; and
frequency shift the native frequency MIMO uplink signals into non-overlapping frequency MIMO uplink signals;
b) a single coaxial cable used to carry the non-overlapping frequency MIMO uplink signals between the at least one antenna unit and a remote unit; and
c) the remote unit configured to receive the non-overlapping frequency MIMO uplink signals from the at least one antenna unit carried over the single coaxial cable;
the at least one antenna unit further configured to distribute the non-overlapping frequency MIMO uplink signals over the single coaxial cable to the remote unit.
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Accused Products
Abstract
A method and system for supporting MIMO technologies which can require the transport of multiple spatial streams on a traditional Distributed Antenna System (DAS). According to the invention, at one end of the DAS, each spatial stream is shifted in frequency to a pre-assigned band (such as a band at a frequency lower than the native frequency) that does not overlap the band assigned to other spatial streams (or the band of any other services being carried by the DAS). Each of the spatial streams can be combined and transmitted as a combined signal over a common coaxial cable. At the other “end” of the DAS, the different streams are shifted back to their original (overlapping) frequencies but retain their individual “identities” by being radiated through physically separate antenna elements.
125 Citations
36 Claims
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1. A distributed antenna system for distributing MIMO signals for at least one MIMO service in a distributed antenna system (DAS), comprising:
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a) at least one antenna unit operatively coupled to at least two MIMO antennas, wherein the at least one antenna unit is configured to; receive native frequency MIMO uplink signals of at least one MIMO service; and frequency shift the native frequency MIMO uplink signals into non-overlapping frequency MIMO uplink signals; b) a single coaxial cable used to carry the non-overlapping frequency MIMO uplink signals between the at least one antenna unit and a remote unit; and c) the remote unit configured to receive the non-overlapping frequency MIMO uplink signals from the at least one antenna unit carried over the single coaxial cable; the at least one antenna unit further configured to distribute the non-overlapping frequency MIMO uplink signals over the single coaxial cable to the remote unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of distributing MIMO signals for at least one MIMO service in a distributed antenna system (DAS), comprising:
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receiving native frequency MIMO uplink signals for at least one MIMO service at at least two MIMO antennas operatively coupled to at least one antenna unit; frequency shifting the native frequency MIMO uplink signals into non-overlapping frequency MIMO uplink signals; communicating the non-overlapping frequency MIMO uplink signals over a single coaxial cable from the at least one antenna unit to a remote unit; and receiving the non-overlapping frequency MIMO uplink signals communicated over the single coaxial cable at the remote unit. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification