Beamforming in MIMO communication systems
AssigneeProvigent Ltd.
InventorsRafi Ravid, Zohar Montekyo, Ahikam Aharony
Life of this patent
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Abstract
A communication terminal includes first and second transmitters, which are coupled to produce respective first and second Radio Frequency (RF) signals that are phase-shifted with respect to one another by a beamforming phase offset, and to transmit the RF signals toward a remote communication terminal. The terminal includes a reception subsystem including first and second receivers and a phase correction unit. The first and second receivers are respectively coupled to receive third and fourth RF signals from the remote communication terminal. The phase correction unit is coupled to produce, responsively to the third and fourth RF signals, a phase correction for correcting an error component in the beamforming phase offset.
Claims20
A communication system, comprising:
- transmission baseband circuitry configured to produce first and second baseband signals having a first beamforming phase offset therebetween, the first baseband signal including a first sequence of first pilot symbols, and the second baseband signal including a second sequence of second pilot symbols, each first pilot symbol being configured to be transmitted concurrently with a corresponding second pilot symbol, wherein
- at least one of the first sequence and the second sequence includes a first interleaved sub-sequence of interleaved pilot symbols and a second interleaved sub-sequence of interleaved pilot symbols, each of the interleaved pilot symbols in the first interleaved sub-sequence having a first phase offset relative to another interleaved pilot symbol in the first interleaved sub-sequence, and each of the interleaved pilot symbols in the second interleaved sub-sequence having a second phase offset relative to another interleaved pilot symbol in the second interleaved sub-sequence, the first phase offset being different than the second phase offset.
A communication method to be used in a communication device, the method comprising:
- producing, in the communication device, first and second baseband signals having a first beamforming phase offset therebetween, the first baseband signal including a first sequence of first pilot symbols, and the second baseband signal including a second sequence of second pilot symbols;
- and
- transmitting, from the communication device, each first pilot symbol concurrently with a corresponding second pilot symbol, wherein at least one of the first and second sequences includes a first interleaved sub-sequence of interleaved pilot symbols and a second interleaved sub-sequence of interleaved pilot symbols, each of the interleaved pilot symbols in the first interleaved sub-sequence having a first phase offset relative to another interleaved pilot symbol in the first interleaved sub-sequence, and each of the interleaved pilot symbols in the second interleaved sub-sequence having a second phase offset relative to another interleaved pilot symbol in the second interleaved sub-sequence, the first phase offset being different than the second phase offset.
A communication system comprising:
- transmission baseband circuitry configured to produce first and second baseband signals having a first beamforming phase offset therebetween, the first baseband signal including a first sequence of first pilot symbols, and the second baseband signal including a second sequence of second pilot symbols, each first pilot symbol being configured to be transmitted concurrently with a corresponding second pilot symbol, wherein at least one of the first and second sequences includes a first interleaved sub-sequence of interleaved pilot symbols and a second interleaved sub-sequence of interleaved pilot symbols, each of the interleaved pilot symbols in the first interleaved sub-sequence having a first phase offset relative to another interleaved pilot symbol in the first interleaved sub-sequence, and each of the interleaved pilot symbols in the second interleaved sub-sequence having a second phase offset relative to another interleaved pilot symbol in the second interleaved sub-sequence, the first phase offset being different than the second phase offset;
- and
- reception baseband circuitry configured to measure respective magnitudes of the interleaved pilot symbols included in the first and second interleaved sub-sequences, and to process the measured first and second magnitudes to compute a second beamforming phase offset to correct an error included in the first beamforming phase offset.
Dependencies are inferred from the claim text.