LTE Baseband Signal Compression via Asymmetric Filtering
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Solution Overview
Problem
Existing LTE systems face inefficiencies in utilizing nonstandard bandwidths due to symmetric filtering methods, which result in waste of spectrum resources and increased interference from other standard systems.
Innovation Solution
A method and apparatus that shift the center frequency of baseband signals and perform frequency conversion to filter out edge signals on one side, allowing for the use of nonstandard bandwidths without wasting resource blocks or guard bands, thereby improving spectrum resource utilization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If symmetric filtering is used to compress nonstandard bandwidth, then the bandwidth can be adjusted to fit operator requirements, but resource blocks are wasted and spectrum utilization decreases
Solution Approach 1:
The patent applies asymmetric filtering instead of symmetric filtering. The filter is designed to compress only one side of the bandwidth (either left or right) while leaving the other side uncompressed. This asymmetric approach allows the nonstandard bandwidth to be achieved without wasting resource blocks, as the compression is concentrated on one side only, thereby improving spectrum resource utilization while maintaining bandwidth adaptability.
2Adaptability or versatility
If symmetric filtering is used to compress nonstandard bandwidth, then bandwidth adjustment is achieved, but interference from other standard systems increases
Solution Approach 1:
By using asymmetric filtering that compresses only one side of the spectrum, the patent reduces the transition band requirements compared to symmetric filtering. This minimizes the spurious signals and interference generated during bandwidth compression, thereby reducing harmful effects on other standard systems while maintaining the ability to adjust bandwidth to nonstandard values.
3Adaptability or versatility
If filter compression is applied to nonstandard bandwidth, then the bandwidth fits operator constraints, but device complexity increases
Solution Approach 1:
The patent extracts and removes the unnecessary symmetric filtering operation, keeping only the essential asymmetric filtering component. By eliminating the redundant symmetric compression operation and retaining only the necessary asymmetric filter, the system achieves nonstandard bandwidth support with reduced complexity, as the asymmetric filter requires fewer processing stages and simpler configuration compared to symmetric filtering.
Data Source
AI summary
Embodiments of the present disclosure provide a method and an apparatus for downlink and uplink compression of a nonstandard bandwidth of an LTE system. Abase station filters a baseband signal by using a filter whose bandwidth is a nonstandard bandwidth of LTE, and filters out a signal outside the nonstandard bandwidth of LTE; and the base station may send a signal to a terminal by using the nonstandard bandwidth of LTE that can be provided by an operator.