Distributed antenna system for MIMO signals
First Claim
1. A method comprising:
- receiving at least one set of multiple input multiple output (MIMO) channel signals at an original MIMO frequency from at least one signal source at a master unit of a distributed antenna system, at least one set of the MIMO channel signals including at least a first MIMO channel signal and a second MIMO channel signal;
generating a local oscillator signal at the master unit;
frequency converting the at least one of the first MIMO channel signal and the second MIMO channel signal from an original MIMO frequency to a different frequency different from a first legacy service frequency band using the local oscillator signal at the master unit;
receiving at least one non-MIMO signal that has a frequency in the first legacy service band at the master unit;
processing the at least one converted MIMO channel signal and the at least one non-MIMO signal at the master unit;
combining the at least one non-MIMO signal in the first legacy frequency band along with the first MIMO channel signal, the second MIMO channel signal, and the local oscillator signal into a combined signal at the master unit;
transmitting the combined signal across an optical link to a remote unit;
processing together the at least one non-MIMO signal in the first legacy service frequency band and the at least one of the first MIMO channel signal and the second MIMO channel signal at the remote unit; and
frequency converting the at least one converted MIMO channel signal from the different frequency different from the first legacy service frequency band back to the original MIMO frequency for transmission over at least one antenna.
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Abstract
A method includes: receiving MIMO channel signals at original MIMO frequency from signal source(s) at master unit of DAS, set(s) of the MIMO channel signals including first MIMO channel signal and second MIMO channel signal; generating local oscillator signal at master unit; frequency converting first MIMO channel signal(s) and second MIMO channel signal(s) from original MIMO frequency to different frequency different from first legacy service frequency band using local oscillator signal at master unit; combining first MIMO channel signal, second MIMO channel signal, and local oscillator signal into combined signal at master unit; transmitting combined signal across optical link to remote unit; processing first MIMO channel signal and/or second MIMO channel signal at remote unit; and frequency converting converted MIMO channel signal(s) from different frequency different from first legacy service frequency band back to original MIMO frequency for transmission over antenna(s).
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Citations
18 Claims
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1. A method comprising:
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receiving at least one set of multiple input multiple output (MIMO) channel signals at an original MIMO frequency from at least one signal source at a master unit of a distributed antenna system, at least one set of the MIMO channel signals including at least a first MIMO channel signal and a second MIMO channel signal; generating a local oscillator signal at the master unit; frequency converting the at least one of the first MIMO channel signal and the second MIMO channel signal from an original MIMO frequency to a different frequency different from a first legacy service frequency band using the local oscillator signal at the master unit; receiving at least one non-MIMO signal that has a frequency in the first legacy service band at the master unit; processing the at least one converted MIMO channel signal and the at least one non-MIMO signal at the master unit; combining the at least one non-MIMO signal in the first legacy frequency band along with the first MIMO channel signal, the second MIMO channel signal, and the local oscillator signal into a combined signal at the master unit; transmitting the combined signal across an optical link to a remote unit; processing together the at least one non-MIMO signal in the first legacy service frequency band and the at least one of the first MIMO channel signal and the second MIMO channel signal at the remote unit; and frequency converting the at least one converted MIMO channel signal from the different frequency different from the first legacy service frequency band back to the original MIMO frequency for transmission over at least one antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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receiving a plurality of sets of multiple input multiple output (MIMO) channel signals at respective original first and second MIMO frequencies at a master unit of a distributed antenna system, each set of the MIMO channel signals including at least a first MIMO channel signal and a second MIMO channel signal; generating a local oscillator signal at the master unit; frequency converting the at least one of the first MIMO channel signals from the original first MIMO frequency to a first different frequency different from a first legacy service frequency band using the local oscillator signal at the master unit; frequency converting the at least one of the second MIMO channel signals from the original second MIMO frequency to a second different frequency different from a second legacy service frequency band based on the local oscillator signal at the master unit; receiving a plurality of non-MIMO signals that have original frequencies in at least the first legacy service frequency band and the second legacy service frequency band at the master unit; processing the plurality of non-MIMO signals using the band processing circuit component at the master unit; combining the plurality of non-MIMO signals in the at least the first legacy service frequency band and the second legacy service frequency band along with the at least one of the first MIMO channel signals, the at least one of the second MIMO channel signals, and the local oscillator signal at the master unit into a combined signal at the master unit; transmitting the combined signal across an optical link to a remote unit; processing together the plurality of non-MIMO signals in the at least the first legacy frequency band and the at least one converted first MIMO channel signal at the remote unit; processing together the plurality of non-MIMO signals in the at least the second legacy service frequency band and the at least one converted second MIMO channel signal at the remote unit; frequency converting the at least one converted first MIMO channel signal from the first different frequency different from the first legacy service frequency band and back to the first MIMO frequency for transmission over the at least one antenna; and frequency converting the at least one converted second MIMO channel signal from the second different frequency different from the second legacy service frequency band and back to the second MIMO frequency for transmission over at least one antenna. - View Dependent Claims (16, 17, 18)
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Specification