Methods and apparatus for multiple-antenna communication of wireless signals with embedded synchronization/pilot sequences
First Claim
1. A method for generating synchronization and pilot sequences for multiple antennas of a multiple-antenna transmit system in which signals are communicated across a frequency range that includes one or more sets of consecutive null subcarriers and a set of in-band subcarriers that is adjacent to the one or more sets of consecutive null subcarriers, the method comprising the steps of:
- determining, for a first antenna of the multiple antennas, a set of first pilot subcarriers for a plurality of pilot signals, wherein the first pilot subcarriers are positioned at subcarriers that are orthogonal in frequency with subcarriers at which pilot signals of other antennas of the multiple antennas are positioned, and the first pilot subcarriers are unevenly spaced across the in-band subcarriers;
specifying a first frequency domain power profile for a first set of synchronization and pilot sequences to be utilized in conjunction with the first antenna, wherein the first frequency domain power profile has non-zero power for the first pilot subcarriers; and
generating the first set of the synchronization and pilot sequences using the first frequency domain power profile.
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Accused Products
Abstract
Embodiments include methods for determining synchronization/pilot sequences (SPS) to be utilized in conjunction with transmissions by antennas of a multiple-antenna transmitter. The SPS include pilot signals that are positioned at subcarriers that are orthogonal in frequency with subcarriers at which pilot signals of other antennas are positioned. The pilot signals may be unevenly spaced across the in-band subcarriers. The multiple-antenna transmit system generates a plurality of wireless signals, each of which may include an SPS having synchronization information in a first plurality of in-band subcarriers and the pilot signals in a second plurality of in-band subcarriers. The wireless signals are simultaneously radiated over a wireless communication channel using a different antenna. A receiver receives channel-affected versions of the wireless signals, and produces a corrected signal by applying corrections to the received signal based on estimated channel perturbations within the received signal.
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Citations
31 Claims
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1. A method for generating synchronization and pilot sequences for multiple antennas of a multiple-antenna transmit system in which signals are communicated across a frequency range that includes one or more sets of consecutive null subcarriers and a set of in-band subcarriers that is adjacent to the one or more sets of consecutive null subcarriers, the method comprising the steps of:
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determining, for a first antenna of the multiple antennas, a set of first pilot subcarriers for a plurality of pilot signals, wherein the first pilot subcarriers are positioned at subcarriers that are orthogonal in frequency with subcarriers at which pilot signals of other antennas of the multiple antennas are positioned, and the first pilot subcarriers are unevenly spaced across the in-band subcarriers; specifying a first frequency domain power profile for a first set of synchronization and pilot sequences to be utilized in conjunction with the first antenna, wherein the first frequency domain power profile has non-zero power for the first pilot subcarriers; and generating the first set of the synchronization and pilot sequences using the first frequency domain power profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for wirelessly communicating signals across a frequency range that includes one or more sets of consecutive null subcarriers and a set of in-band subcarriers that is adjacent to the one or more sets of consecutive null subcarriers, the method comprising the steps of:
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generating a plurality of wireless signal for transmission, wherein each of the plurality of wireless signals includes a synchronization and pilot sequence having synchronization information in a first plurality of in-band subcarriers and a plurality of pilot signals in a second plurality of in-band subcarriers, wherein the second plurality of in-band subcarriers are unevenly spaced across the in-band subcarriers for at least one of the plurality of wireless signals, and pilot signals of each of the plurality of wireless signals are positioned at subcarriers that are orthogonal in frequency with subcarriers at which pilot signals of all other ones of the plurality of wireless signals are positioned; and simultaneously radiating each of the wireless signals over a wireless communication channel using a different one of a plurality of antennas. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising the steps of:
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receiving a received signal from a wireless communication channel, wherein the received signal represents channel-affected versions of a plurality of wireless signals that were transmitted by a multiple-antenna transmitter, and wherein each of the wireless signals includes a synchronization and pilot sequence with synchronization information and a plurality of pilot signals represented within a plurality of pilot subcarriers, wherein the plurality of pilot signals for at least one of the plurality of wireless signals are unevenly spaced with respect to adjacent pilots, and pilot signals of each of the plurality of wireless signals are orthogonal in frequency with pilot signals of all other ones of the plurality of wireless signals; producing a corrected signal by applying corrections to the received signal based on estimated channel perturbations within the received signal, which estimated channel perturbations are determined based on the plurality of pilot signals; and producing an output data symbol from the corrected signal. - View Dependent Claims (21, 22, 23, 24)
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25. A system comprising:
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one or more signal generators configured to generate a plurality of wireless signals for transmission, wherein each of the plurality of wireless signals includes a synchronization and pilot sequence with synchronization information and a plurality of pilot signals, and the pilot signals within each of the plurality of wireless signals are represented in a plurality of in-band subcarriers that are unevenly spaced across the in-band subcarriers, and pilot signals of each of the plurality of wireless signals are orthogonal in frequency with pilot signals of all other ones of the plurality of wireless signals; and a plurality of antennas, operably coupled with the one or more signal generators, and configured simultaneously to radiate each of the wireless signals over a wireless communication channel. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification