System and method for emulating a multiple input, multiple output transmission channel
First Claim
1. A MIMO channel emulator comprising a channel emulator mixing matrix, the channel emulator mixing matrix receiving N inputs and generating M outputs, the channel emulator mixing matrix comprising:
- a plurality of splitters, each splitter receiving at least one of the N inputs, each splitter generating a plurality of signal paths;
at least one phase shifter, each phase shifter adjustably shifting a phase of at least one signal path; and
a plurality of combiners, each combiner receiving more than one of the plurality of signal paths, at least one combiner receiving a phase adjusted signal path, each combiner generating at least one of the M outputs.
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Abstract
The invention includes a MIMO channel emulator that includes a channel emulator matrix. The channel emulator matrix receives N inputs and generating M outputs. The channel emulator matrix includes a plurality of splitters. Each splitter receives at least one of the N inputs, and each splitter generates a plurality of signal paths. The channel emulator matrix further includes at least one phase shifter. Each phase shifter adjustably shifts a phase of at least one signal path. The channel emulator matrix further includes a plurality of combiners. Each combiner receives more than one of the plurality of signal paths. At least one of the combiners receives a phase adjusted signal path, and each combiner generates at least one of the M outputs. The invention can also include a plurality of fading emulators. Each fading emulator receives at least one emulator input. The plurality of emulators generate the N splitter inputs. The fading emulators can include fading delay lines. The fading emulators can be adjusted so that each of the M outputs are not fully correlated with each of the other M outputs. The invention can also include a plurality of second splitters. Each second splitter receives at least one channel input signal. Each second splitter generates a plurality of second signal. This embodiment further includes at least one second phase shifter. Each second phase shifter adjustably shifts a phase of at least one second signal. This embodiment further includes a plurality of second combiners. Each second combiner receives more than one of the plurality of second signal paths. At least one second combiner receives a phase adjusted second signal path. Each second combiner generates at least one of the fading emulator inputs.
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Citations
21 Claims
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1. A MIMO channel emulator comprising a channel emulator mixing matrix, the channel emulator mixing matrix receiving N inputs and generating M outputs, the channel emulator mixing matrix comprising:
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a plurality of splitters, each splitter receiving at least one of the N inputs, each splitter generating a plurality of signal paths;
at least one phase shifter, each phase shifter adjustably shifting a phase of at least one signal path; and
a plurality of combiners, each combiner receiving more than one of the plurality of signal paths, at least one combiner receiving a phase adjusted signal path, each combiner generating at least one of the M outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A MIMO channel emulator comprising a channel emulator mixing matrix, the channel emulator mixing matrix receiving N inputs and generating M outputs, the channel emulator mixing matrix comprising:
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a plurality of splitters, each splitter receiving at least one of the N inputs, each splitter generating a plurality of signal paths;
at least one attenuator, each attenuater adjustably attenuating an amplitude of at least one signal path; and
a plurality of combiners, each combiner receiving more than one of the plurality of signal paths, at least one combiner receiving an amplitude adjusted signal path, each combiner generating at least one of the M outputs. - View Dependent Claims (14, 15)
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16. A method of emulating a transmission channel receiving N inputs and generating M outputs, the method comprising:
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splitting at least one of the N inputs, each split input generating a plurality of signal paths;
adjustably phase shifting a phase of at least one signal path; and
combining the plurality of signal paths generating the M outputs, at least one combination including a phase adjusted signal path. - View Dependent Claims (17, 18, 19, 20)
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21. A MIMO channel emulator comprising a channel emulator mixing matrix, the channel emulator mixing matrix receiving N inputs and generating M outputs, the channel emulator mixing matrix comprising:
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a plurality of splitters, each splitter receiving at least one of the N inputs, each splitter generating a plurality of signal paths;
at least one phase shifter, each phase shifter adjustably shifting a phase of at least one signal path;
a plurality of combiners, each combiner receiving more than one of the plurality of signal paths, at least one combiner receiving a phase adjusted signal path, each combiner generating at least one of the M outputs. a plurality of fading emulators, each fading emulator receiving at least one emulator input, the plurality of emulators generating the N splitter inputs;
a plurality of second splitters, each second splitter receiving at least one channel input signal, each second splitter generating a plurality of second signal paths;
at least one second phase shifter, each second phase shifter adjustably shifting a phase of at least one second signal path; and
a plurality of second combiners, each second combiner receiving more than one of the plurality of second signal paths, at least one second combiner receiving a phase adjusted second signal path, each second combiner generating at least one of the fading emulator inputs.
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Specification