Reference Signal Formation Method for Channel Estimation Accuracy
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Solution Overview
Problem
Existing methods for transmitting reference signals in non-contiguous frequency transmission face challenges in maintaining accurate channel estimation, particularly when the number of clusters is large or channel variation between clusters is significant.
Innovation Solution
A radio transmission apparatus and method that switch between two reference signal formation methods based on a switch threshold value and the number of bandwidth blocks. The first method divides a base code sequence into subsequences matching each bandwidth block, while the second method adjusts the lengths of base code sequences to match each bandwidth block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If reference signals are generated from one code sequence by dividing into subsequences for each cluster, then interference suppression is improved, but channel estimation accuracy deteriorates when the number of clusters is large or channel variation between clusters is significant
Solution Approach 1:
The patent segments the reference signal generation approach into two distinct methods: Method 1 divides one base code sequence into multiple subsequences assigned to different clusters, while Method 2 uses multiple independent base code sequences. The system selectively applies the appropriate segmentation strategy based on the number of clusters and channel conditions, thereby optimizing both interference suppression and channel estimation accuracy.
Solution Approach 2:
The patent implements dynamic selection between the two reference signal formation methods based on real-time system conditions (number of clusters and channel variation characteristics). This dynamic adaptation allows the system to switch from Method 1 (better for interference suppression when clusters are few) to Method 2 (better for channel estimation accuracy when clusters are many or channel variation is significant), resolving the contradiction through conditional adaptability.
2Measurement precision
If reference signals are generated from multiple code sequences with adjusted lengths for each cluster, then channel estimation accuracy is maintained, but interference suppression effects are reduced
Solution Approach 1:
The patent changes the parameters of reference signal generation by adjusting code sequence lengths and selecting between one or multiple base code sequences based on system conditions. When channel estimation accuracy is prioritized (many clusters or significant channel variation), Method 2 uses multiple code sequences with adjusted lengths. When interference suppression is prioritized (few clusters), Method 1 uses a single code sequence divided into subsequences, optimizing performance for each scenario.
3Reliability
If non-contiguous frequency transmission is used to gain frequency diversity effects, then reception characteristics are improved, but reference signal transmission complexity increases
Solution Approach 1:
The patent creates a universal reference signal transmission framework that handles both contiguous and non-contiguous frequency transmission scenarios. By implementing a unified method that dynamically selects between Method 1 and Method 2 based on the number of clusters and channel conditions, the system maintains reception characteristics across different transmission modes without requiring separate complex processing for each scenario.
Data Source
AI summary
Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.