Broadcast Signal Mapping Without Guard Tone Detection
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in decoding signals due to the need to locate and interpret guard tones, which requires processing cycles to determine the start and end of guard bandwidths, leading to dependency on multiple conversion and decoding steps.
Innovation Solution
A method for guard tone independent mapping and de-mapping of symbols across a bandwidth, where symbols are initialized across all tones regardless of guard tone locations, and symbols mapped to guard tones are zeroed out, allowing for decoding of the center portion of the bandwidth without determining the exact guard tone positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard bandwidth is provided between contiguous or adjacent frequencies to prevent data leakage, then carrier isolation is improved, but decoding complexity increases due to the need to locate and interpret guard tones
Solution Approach 1:
The patent extracts the guard tones from the data-bearing bandwidth by mapping data symbols only to non-guard tones. The guard tones are completely removed from the active data transmission area, allowing receivers to decode only the central data portion without needing to identify or process guard tone locations, thus reducing decoding complexity while maintaining carrier isolation
Solution Approach 2:
The patent segments the total bandwidth into guard tone portions and data-bearing portions. By separating these functions spatially in the frequency domain, the system allows independent processing of data symbols on non-guard tones, eliminating the need for receivers to locate and interpret guard tones while preserving the protective function of guard bands
2Reliability
If data transmission starts after guard bandwidth and decoding locates guard bandwidth positions, then carrier isolation is maintained, but processing time increases due to multiple processor cycles required to determine guard tone locations
Solution Approach 1:
The patent performs preliminary action by pre-defining the mapping relationship between data symbols and non-guard tones before transmission. The base station maps symbols to specific non-guard tones based on predetermined knowledge of guard tone locations, allowing the receiver to immediately decode the central portion without time-consuming location determination, thus reducing processing delay while maintaining isolation
3Productivity
If symbols are mapped to all tones including guard tones, then bandwidth utilization is maximized, but decoding errors increase due to the need to locate and interpret guard tone positions
Solution Approach 1:
The patent extracts guard tones from the active data mapping process by restricting symbol mapping to only non-guard tones. This extraction ensures that no data symbols are assigned to guard tone positions, eliminating decoding errors caused by guard tone interpretation while still efficiently utilizing the central data-bearing bandwidth
Solution Approach 2:
The patent applies local quality by treating different portions of the bandwidth differently: guard tones remain as protective empty spaces while non-guard tones are actively used for data transmission. This localized differentiation optimizes both reliability (by preventing guard tone interference) and productivity (by maximizing use of data-bearing frequencies)
Data Source
AI summary
Systems and methodologies are described that facilitate guard bandwidth independent mapping and de-mapping of bandwidth in a wireless communication system. Broadcast signals can be created as if all bandwidth were available, and guard bandwidth can be initialized over the utilized bandwidth such to puncture the data existing in the guard bandwidth. Upon decoding the broadcast signal, size of the guard bandwidth can be predetermined or estimated allowing a center portion of the signal to be decoded without decoding the guard bandwidth. In this regard, the decoder of the signal need not find exact positions of the guard bandwidth as transforming and decoding the center portion can provide a substantial portion of the signal to interpret the signal.