Pilot packing using complex orthogonal functions
First Claim
Patent Images
1. A method for wireless communication, comprising:
- generating a pilot signal that is represented as a complex exponential signal having both a first linear phase in a time dimension and a second linear phase in a frequency dimension; and
transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network,wherein the generating the pilot signal comprises generating the pilot signals by delay-Doppler domain packing by;
selecting a time-frequency lattice that meets a target overhead allocation;
packing a number of pilots in a torus corresponding to the time-frequency lattice, the number of pilots being selected to meet target delay and Doppler spreads of a channel in the legacy transmission network; and
transforming the number of pilots in the torus into a delay-Doppler domain by applying a symplectic transform.
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Abstract
A wireless communication method includes generating a pilot signal that is represented using a complex exponential signal having a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network such as a Long Term Evolution (LTE) network.
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Citations
15 Claims
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1. A method for wireless communication, comprising:
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generating a pilot signal that is represented as a complex exponential signal having both a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network, wherein the generating the pilot signal comprises generating the pilot signals by delay-Doppler domain packing by; selecting a time-frequency lattice that meets a target overhead allocation; packing a number of pilots in a torus corresponding to the time-frequency lattice, the number of pilots being selected to meet target delay and Doppler spreads of a channel in the legacy transmission network; and transforming the number of pilots in the torus into a delay-Doppler domain by applying a symplectic transform. - View Dependent Claims (2, 3, 4)
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5. A method for wireless communication, comprising:
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generating a pilot signal that is represented as a complex exponential signal having both a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network, wherein the generating the pilot signal comprises generating the pilot signals by time-frequency packing, including; choosing a time-frequency pilot lattice to support channel estimation by a receiver based on a single pilot signal; generating an arrangement of pilot signals by staggering multiple time-frequency pilot lattices with equal distance between lattice points to meet a target overhead; mapping the single pilot signal to a delay-Doppler torus associated with the time-frequency pilot lattice; transforming the single pilot signal in the torus into a delay-Doppler domain by applying a symplectic transform; creating the multiple time-frequency lattices and staggering the multiple time-frequency lattices; and applying a window function to each time-frequency plane. - View Dependent Claims (6, 7, 8)
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9. A method for wireless communication, comprising:
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generating a pilot signal that is represented as a complex exponential signal having both a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network, wherein the generating the pilot signal comprises generating the pilot signals by a latency sensitive pilot packing, including; choosing a time-frequency pilot lattice that meets a target overhead; selecting a smallest size pilot observation window in time domain to support one pilot signal in Doppler torus; packing a number of pilots in a torus corresponding to the time-frequency lattice, the number of pilots being selected to meet target delay and Doppler spreads of a channel in the legacy transmission network; transforming the delay-Doppler domain to the time-frequency domain by applying a symplectic transform; and applying a window function in the time-frequency domain. - View Dependent Claims (10, 11, 12)
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13. An apparatus for wireless communication, comprising:
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a processor; and a transmitter communicatively coupled to the processor, wherein the processor is configured to generate a pilot signal that is represented as a complex exponential signal having both a first linear phase in a time dimension and a second linear phase in a frequency dimension, wherein the transmitter is configured to transmit the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network, and wherein generating the pilot signal is based on delay-Doppler domain packing with the processor being further configured to; select a time-frequency lattice that meets a target overhead allocation; pack a number of pilots in a torus corresponding to the time-frequency lattice, the number of pilots being selected to meet target delay and Doppler spreads of a channel in the legacy transmission network; and transform the number of pilots in the torus into a delay-Doppler domain by applying a symplectic transform. - View Dependent Claims (14, 15)
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Specification