A method of reducing peak to average power ratio of uplink transmission includes, assigning a slice of transmission resource to uplink transmission from a user equipment, where all resource elements in the slice have a same Doppler value, mapping data to the slice, performing orthogonal time frequency space transformation to generate time-frequency domain data and processing the time-frequency domain data for transmission.

Techniques are provided for providing Doppler correction. In particular, embodiments may provide re-banding circuitry having a reference clock, a mixer, and a compensation circuitry for re-banding and for Doppler correction. The compensation circuitry may be configured to adjust a reference frequency of the reference clock based on signals received from a Global Navigation Satellite System (GNSS) receiver. The mixer may be configured to translate communication signals in a first frequency band to a second frequency band based at least in part on the adjusted reference frequency of the reference clock.

Techniques are provided for providing Doppler correction. In particular, embodiments may provide re-banding circuitry having a reference clock, a mixer, and a compensation circuitry for re-banding and for Doppler correction. The compensation circuitry may be configured to adjust a reference frequency of the reference clock based on signals received from a Global Navigation Satellite System (GNSS) receiver. The mixer may be configured to translate communication signals in a first frequency band to a second frequency band based at least in part on the adjusted reference frequency of the reference clock.

Automatic frequency controllers, automatic frequency control methods, wireless communication devices, and/or wireless communication methods are provided. The automatic frequency controllers for correcting a frequency offset between a base station and a terminal includes at least one processor communicatively coupled to a memory and configured to execute computer-readable instructions stored in the memory to obtain a phase estimate from a reference signal received from the base station; classify a downlink channel as a High Speed Train (HST) channel or a non-HST channel based on the phase estimate; adjust a loop gain according to the classified downlink channel; calculate a phase error based on the phase estimate and the loop gain; correct the frequency offset using the phase error; and communicate with the base station after correcting the frequency offset.

Automatic frequency controllers, automatic frequency control methods, wireless communication devices, and/or wireless communication methods are provided. The automatic frequency controllers for correcting a frequency offset between a base station and a terminal includes at least one processor communicatively coupled to a memory and configured to execute computer-readable instructions stored in the memory to obtain a phase estimate from a reference signal received from the base station; classify a downlink channel as a High Speed Train (HST) channel or a non-HST channel based on the phase estimate; adjust a loop gain according to the classified downlink channel; calculate a phase error based on the phase estimate and the loop gain; correct the frequency offset using the phase error; and communicate with the base station after correcting the frequency offset.

A system and methods are described which compensate for the adverse effect of Doppler on the performance of DIDO systems. One embodiment of such a system employs different selection algorithms to adaptively adjust the active BTSs to different UEs based by tracking the changing channel conditions. Another embodiment utilizes channel prediction to estimate the future CSI or DIDO precoding weights, thereby eliminating errors due to outdated CSI.

A system and methods are described which compensate for the adverse effect of Doppler on the performance of DIDO systems. One embodiment of such a system employs different selection algorithms to adaptively adjust the active BTSs to different UEs based by tracking the changing channel conditions. Another embodiment utilizes channel prediction to estimate the future CSI or DIDO precoding weights, thereby eliminating errors due to outdated CSI.

This method, executed in a group of nodes of the ad hoc network (1) including a source (10), first and second relays (11, 12) and an addressee (13), the relays being neighbors of the source, the addressee being a neighbor of the relays, the source having useful data to be retransmitted towards a final addressee (15) through a routing path passing through the first relay (11), and then the addressee (13), consist of: computing a first characteristic quantity of an elementary path between the source (10) and the addressee (13), via the first relay (11) and a second characteristic quantity of an elementary path between the source (10) and the addressee (13), via the second relay (11); verifying the observance of a criterion for the first characteristic quantity; and, in case of negative verification, using the second relay (12) for relaying the useful data from the source (10), towards the addressee (13).

This method, executed in a group of nodes of the ad hoc network (1) including a source (10), first and second relays (11, 12) and an addressee (13), the relays being neighbors of the source, the addressee being a neighbor of the relays, the source having useful data to be retransmitted towards a final addressee (15) through a routing path passing through the first relay (11), and then the addressee (13), consist of: computing a first characteristic quantity of an elementary path between the source (10) and the addressee (13), via the first relay (11) and a second characteristic quantity of an elementary path between the source (10) and the addressee (13), via the second relay (11); verifying the observance of a criterion for the first characteristic quantity; and, in case of negative verification, using the second relay (12) for relaying the useful data from the source (10), towards the addressee (13).

In an embodiment, a method includes continuously receiving, from a camera, raw video frames at an initial resolution. The method also includes, for each raw video frame, as the raw video frame is received: downscaling the raw video frame to a first resolution to yield a first scaled video frame; downscaling the raw video frame to a second resolution distinct from the first resolution to yield a second scaled video frame; identifying a location of a target; cropping at least video frame based, at least in part, on the location of the target; and storing the first scaled video frame, the second scaled video frame, and information related to the cropped at least one video frame as part of a first video stream, a second video stream, and a third video stream, respectively.