Zero Tail Waveform Generation for High-Frequency Wireless
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Solution Overview
Problem
High-frequency wireless communication systems above 6 GHz face challenges due to high free space path loss, atmospheric attenuation, and foliage effects, which degrade data and control channel performance, especially in non-line-of-sight environments, and require effective methods to maintain connectivity and improve beam alignment.
Innovation Solution
The implementation of exact zero tail data signals in wireless communication systems, achieved by generating and transmitting data signals with a zero tail length through processor-based methods, including frequency domain mapping, time-domain conversion, and cancellation signal generation, to enhance data transmission and reception in high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow beam patterns are used to counter high frequency path loss, then signal transmission quality is improved, but device complexity increases due to beamforming requirements
Solution Approach 1:
The patent segments the beamforming process into two independent components: a first beamforming component for downlink control channels and a second beamforming component for downlink data channels. This segmentation allows each component to be optimized independently, reducing overall system complexity while maintaining transmission quality.
Solution Approach 2:
The patent implements dynamic beamforming where the first and second beamforming components can be independently adjusted and updated. The base station can dynamically change beamforming parameters for control channels without affecting data channel beamforming, enabling adaptive optimization based on channel conditions.
2Reliability
If beamforming techniques are used to achieve mmW coverage in NLOS conditions, then connectivity is improved, but device complexity increases
Solution Approach 1:
The patent divides beamforming operations into separate control plane and data plane components, allowing independent optimization for NLOS conditions. The first beamforming component handles control signaling while the second handles data transmission, simplifying the overall implementation.
Solution Approach 2:
The patent applies preliminary beamforming processing to control channels before data transmission. By establishing control channel beamforming first, the system prepares the foundation for subsequent data channel beamforming, simplifying the sequential implementation process.
3Productivity
If high frequency bands above 6 GHz are used to increase bandwidth, then data transmission capacity is improved, but signal attenuation from atmospheric gasses and foliage increases
Solution Approach 1:
The patent changes the frequency parameter to operate in high-frequency bands above 6 GHz, which provides large bandwidth for high data transmission capacity. To compensate for the increased attenuation, the patent implements advanced beamforming techniques that concentrate signal energy in specific directions, effectively counteracting the frequency-related losses.
Data Source
AI summary
Methods and systems for operation in a wireless network are provided, the methods including receiving modulated data symbols and zeros in a frequency-domain, and mapping in the frequency-domain the modulated data symbols and zeros in an interleaved manner to sub-carriers within a resource allocation. The methods and systems further include generating a time-domain data signal based on the mapped sub-carriers, and generating a time domain cancellation signal by sign inverting and repeating a predetermined number of time-domain samples at a tail portion of the data signal. The methods and systems further include combining the time-domain data signal and the time domain cancellation signal to generate an exact zero tail data signal such that the exact zero tail data signal has a zero tail length equal to the predetermined number of time-domain samples, and transmitting the exact zero tail data signal.