Reference Signal Transmission in Multiple Antenna Systems
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Solution Overview
Problem
In multiple antenna systems, the design of reference signals for even power transmission is challenging due to increased reference signal overhead, which can lead to decreased data processing load and spectrum efficiency, resulting in deteriorated system performance.
Innovation Solution
The method involves transmitting a first reference signal based on a first sequence through a first antenna group and a second reference signal based on a second sequence through a second antenna group, both using the same radio resource, with the second sequence obtained by cyclic shifting or phase shifting the first sequence, ensuring orthogonal transmission to maintain even power distribution across antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are allocated to all subcarriers (first method), then channel estimation performance is significantly improved, but data transmission rate decreases
Solution Approach 1:
The patent applies partial action by allocating reference signals to only certain subcarriers rather than all subcarriers. Specifically, reference signals are placed on every k-th subcarrier where k>1, providing sufficient channel estimation capability while leaving more subcarriers available for data transmission, thus resolving the contradiction between estimation accuracy and transmission rate
2Productivity
If reference signals are allocated between data subcarriers (second method), then data transmission rate increases, but channel estimation performance deteriorates
Solution Approach 1:
The patent changes the parameter of reference signal density and distribution pattern. By controlling the spacing between reference signal subcarriers (every k-th subcarrier) and optimizing their placement, the system achieves an optimal balance where data transmission rate is improved while channel estimation performance remains sufficient for reliable communication
3Reliability
If reference signal overhead is increased to improve channel estimation, then reliability improves, but spectrum efficiency decreases
Solution Approach 1:
The patent applies local quality by making reference signal density non-uniform across different subcarriers. Reference signals are concentrated on subcarriers where they provide maximum channel estimation benefit, while other subcarriers are used for data transmission. This localized optimization improves spectrum efficiency while maintaining reliability
Data Source
AI summary
A method and an apparatus for transmitting a reference signal in a multiple antenna system are provided. The method includes transmitting a first reference signal based on a first sequence through a first antenna group, and transmitting a second reference signal based on a second sequence through a second antenna group, wherein the first reference signal and the second reference signal are transmitted through a same radio resource.