Pilot Transmission Rules for Phase Deviation Calculation
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Solution Overview
Problem
In wireless local area networks (WLANs) using WiFi technology, the calculation of phase deviation between stations and an access station in MIMO scenarios is complex due to the complexity of pilot transmission and phase synchronization, especially with multiple users and antennas, leading to increased bit error rates and potential signal failure.
Innovation Solution
A pilot transmission method where a station receives a notification with specific pilot transmission rules, dividing subcarriers or symbol periods into groups with consistent amplitudes and phases, allowing for simplified phase deviation calculation by the access station, reducing complexity and improving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pilot transmission methods are used in MIMO scenarios with multiple stations and antennas, then phase deviation can be obtained, but the calculation process becomes complex and computational burden increases
Solution Approach 1:
The patent segments the pilot transmission process by assigning different pilot sequences to different spatial streams and stations. The access point divides the received composite signal into individual station contributions by correlating with known pilot sequences, breaking down the complex matrix inversion problem into simpler correlation operations for each station separately.
Solution Approach 2:
The patent introduces pilot sequences as intermediary signals that facilitate phase deviation measurement. These known pilot sequences act as mediators between the transmitted signal and the received composite signal, enabling the access point to extract phase information through correlation without directly solving the complex multi-station mixing problem.
2Productivity
If more stations transmit pilots simultaneously in MIMO uplink, then more data flows are supported, but the process of solving phase deviation becomes more complex
Solution Approach 1:
The patent segments the multi-station signal processing by using unique pilot sequences for each station and spatial stream. This allows the access point to process each station's contribution separately through correlation, avoiding the need to solve a complex system of equations even when many stations transmit simultaneously.
Solution Approach 2:
Each station's pilot sequence is designed to be self-identifiable through correlation properties. The access point can extract each station's phase deviation independently by correlating the received signal with the known pilot sequence of that station, allowing each station to effectively serve itself in the phase estimation process without requiring complex joint processing.
Data Source
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AI summary
Embodiments of the present invention provide a pilot transmission method, a station, and an access station. The method includes the following steps: receiving, by a station, a pilot transmission notification from an access point, where the pilot transmission notification includes a pilot transmission rule of the station and a pilot transmission rule of another station on a group of continuous subcarriers (201) the pilot transmission rule of the station includes: the group of continuous subcarriers is divided into two subcarrier groups, pilots transmitted on subcarriers in a same subcarrier group have a same amplitude and a same phase, and pilots transmitted on subcarriers in different subcarrier groups have a same amplitude but inverse phases, and the pilot transmission rule of the another station includes: pilots transmitted on all subcarriers have a same amplitude and a same phase; and transmitting, by the station, a pilot according to the pilot transmission rule of the station (202). According to the embodiments of the present invention, complexity of calculating a phase deviation can be reduced.