MIMO Uplink Pilot Signal Broadcasting Method
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Solution Overview
Problem
Conventional MIMO systems face challenges in efficiently managing pilot signaling resources, particularly in dense crowd scenarios where a large number of user equipment devices require pilot signals, leading to increased time and potential interference, which can negatively impact payload data transmission.
Innovation Solution
A method where the same uplink pilot signal is broadcasted from each antenna of the user equipment simultaneously, allowing the base station to determine receiving parameters for focusing energy and enabling orthogonal uplink pilot signals to be sent, thereby reducing resource usage and interference, and allowing parallel transmission of payload data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If orthogonal pilot signals are transmitted from each user equipment in conventional MIMO systems, then channel estimation accuracy is improved, but pilot signaling time and resource consumption increase significantly
Solution Approach 1:
The patent merges the pilot signal transmission from multiple antennas into a single combined pilot signal. Instead of transmitting separate orthogonal pilot signals from each antenna, the system combines them into one unified signal that carries channel estimation information for all antennas, thereby reducing pilot signaling time while maintaining estimation accuracy
Solution Approach 2:
The combined pilot signal serves multiple functions simultaneously: it enables channel estimation for all transmit antennas, provides reference for beamforming, and reduces signaling overhead. This multi-functional approach eliminates the need for separate pilot signals for each antenna
2Measurement precision
If orthogonal pilot signals are transmitted from each user equipment, then channel identification is improved, but interference between pilot signals increases
Solution Approach 1:
By combining pilot signals from multiple antennas into a single transmitted signal, the patent eliminates inter-signal interference that occurs when multiple orthogonal pilot signals are transmitted simultaneously. The combined signal approach ensures that only one pilot signal occupies the time-frequency resources, removing the harmful interference between multiple pilot signals
3Adaptability or versatility
If pilot signaling resources are allocated to multiple user equipment devices, then channel estimation for all devices is enabled, but resource consumption and time requirements increase
Solution Approach 1:
The patent combines pilot signal transmission resources for multiple antennas into a single resource allocation. Instead of assigning separate time-frequency resources for pilot signals from each antenna, the system uses one combined pilot signal that efficiently utilizes resources while enabling channel estimation for all transmit antennas
Solution Approach 2:
The system changes the parameter of pilot signal structure from multiple separate signals to a single combined signal. This parameter change in signal configuration allows the system to maintain multi-user estimation capability while significantly reducing the quantity of pilot signaling resources required
Data Source
AI summary
Operating a cellular multiple-input and multiple-output system including a first device having an antenna array having a plurality of antennas, and a second device having at least two antennas includes a same uplink pilot signal broadcast from each antenna of the second device, and received at the antenna array of the first device. Depending on the received same uplink pilot signal, a first set of first device receiving parameters for the antenna array is determined. From each antenna of the at least two antennas of the second device, a corresponding uplink pilot signal is sent and received at the antenna array of the first device using the first set of first device receiving parameters. At the first device, for each received uplink pilot signal, a corresponding second set of first device receiving parameters is determined depending on the plurality of received orthogonal uplink pilot signals.