Synchronization in a beamforming system
AssigneeMediatek Inc.
InventorsJiann-Ching Guey, Chao-Cheng Su, Ju-Ya Chen
Life of this patent
Estimating the term…
Abstract
A beamforming system synchronization architecture is proposed to allow a receiving device to synchronize to a transmitting device in time, frequency, and spatial domain in the most challenging situation with very high pathloss. A periodically configured time-frequency resource blocks in which the transmitting device uses the same beamforming weights for its control beam transmission to the receiving device. A pilot signal for each of the control beams is transmitted in each of the periodically configured time-frequency resource blocks. The same synchronization signal can be used for all stages of synchronization including initial coarse synchronization, device and beam identification, and channel estimation for data demodulation.
Claims19
A method comprising:
- allocating a set of control resource blocks by a resource allocation circuit of a base station in a beamforming OFDM (Orthogonal Frequency-Division Multiplexing) network, wherein the set of control resource blocks comprises periodically allocated time-frequency resource blocks associated with a set of beamforming weights to form a control beam;
- partitioning each resource block into a pilot part and a data part by a pilot allocation circuit of the base station, wherein each resource block comprises M pilot structures and each pilot structure comprises L OFDM symbols, wherein pilot symbols are inserted once every K subcarriers for R times in each of the L OFDM symbols to form the pilot part while data symbols are inserted in the remaining resource elements to form the data part, and wherein M, L, K, and R are positive integers;
- and
- transmitting the pilot symbols and the data symbols via the control beam to a plurality of user equipments (UEs) by a radio frequency transmitter of the base station, wherein each pilot symbol in each of the mth pilot structures has a signature sequence sm with an offset vm, wherein each sm is generated from a base sequence applied with a circular shift value of vm, and wherein m is a repetition index for the M pilot structures that are associated with the same control beam.
A base station, comprising:
- a resource allocation circuit that allocates a set of control resource blocks in a beamforming OFDM (Orthogonal Frequency-Division Multiplexing) network, wherein the set of control resource blocks comprises periodically allocated time-frequency resource blocks associated with a set of beamforming weights to form a control beam;
- a pilot allocation circuit that partitions each resource block into a pilot part and a data part, wherein each resource block comprises M pilot structures and each pilot structure comprises L OFDM symbols, wherein pilot symbols are inserted once every K subcarriers for R times in each of the L OFDM symbols to form the pilot part while data symbols are inserted in the remaining resource elements to form the data part, and wherein M, L, K, and R are positive integers;
- and
- a radio frequency (RF) transmitter that transmits the pilot symbols and the data symbols via the control beam to a plurality of user equipments (UEs), wherein each pilot symbol in each of the mth pilot structures has a signal sequence sm with an offset vm, wherein each sm is generated from a base sequence applied with a circular shift value of vm, and wherein m is a repetition index for the M pilot structures that are associated with the same control beam.
Dependencies are inferred from the claim text.