Radio Transmission Apparatus Bandwidth-Adaptive ZC Sequence Hopping
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Solution Overview
Problem
Existing radio transmitting apparatuses face increased processing and memory requirements when using ZC sequences for interference randomization across varying transmission bandwidths, leading to inefficiencies in channel estimation and demodulation performance.
Innovation Solution
A radio transmitting apparatus with a hopping pattern setting section that adjusts the switching of code sequences based on transmission bandwidth, allowing for varying time intervals and hopping cycles to reduce processing and memory demands while maintaining interference randomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ZC sequences of different transmission bandwidths are multiplexed in the same band, then interference randomization is improved, but cross-correlation increases significantly
Solution Approach 1:
The patent applies dynamics by making the sequence length adaptable to transmission bandwidth. The sequence length is dynamically adjusted based on the transmission bandwidth being used, rather than using fixed sequence lengths. This allows the system to maintain low cross-correlation by selecting appropriate sequence lengths for each bandwidth scenario while still achieving interference randomization through the hopping mechanism.
Solution Approach 2:
The patent changes the parameter of sequence length based on transmission bandwidth. By varying the sequence length parameter according to the active transmission bandwidth, the system optimizes cross-correlation performance for each bandwidth configuration while maintaining the interference randomization benefits of sequence hopping.
2Manufacturing precision
If sequence length N is increased to reduce cross-correlation, then manufacturing precision is improved, but processing requirements increase
Solution Approach 1:
The patent segments the sequence length selection into discrete values corresponding to different transmission bandwidths. Instead of using a continuously variable or excessively long sequence, the system divides the solution space into manageable sequence length options (e.g., N=11 for 1 RB, N=23 for 2 RBs, etc.), reducing processing complexity while maintaining cross-correlation control.
Solution Approach 2:
The patent optimizes the parameter of sequence length to match transmission bandwidth requirements. By selecting the minimum necessary sequence length for each bandwidth configuration rather than always using the longest sequence, the system reduces processing requirements while still achieving acceptable cross-correlation performance.
3Device complexity
If fixed sequence length is used for all transmission bandwidths, then device complexity is reduced, but cross-correlation deteriorates in certain combinations
Solution Approach 1:
The patent introduces parameter changes by making sequence length dependent on transmission bandwidth. This allows the system to adapt sequence characteristics to specific bandwidth scenarios, avoiding the high cross-correlation problems that occur with fixed sequence lengths while keeping the adaptation mechanism simple and manageable.
Solution Approach 2:
The patent applies local quality by optimizing sequence parameters for local bandwidth conditions. Each transmission bandwidth configuration receives a tailored sequence length selection, ensuring optimal cross-correlation performance for that specific local scenario rather than using a one-size-fits-all approach.
Data Source
AI summary
Disclosed are a radio transmission device and a radio transmission method which can reduce a processing amount or a memory amount while maintaining the randomizing effect of other cell interference. When using as a reference signal, a ZC sequence of the sequence length uniquely correlated to a transmission bandwidth of a reference signal, as the transmission bandwidth becomes smaller and the sequence length of the ZC sequence becomes shorter, the sequence is switched at a shorter time interval and as the transmission bandwidth becomes greater and the sequence length of the ZC sequence becomes longer, the switching is performed at a longer time interval. Thus, a reference signal is generated by using the ZC sequence in accordance with the timing into which the reference signal transmission bandwidth and the sequence are switched.