Preamble Sequence Generation for Wireless System Compatibility
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Solution Overview
Problem
Wireless communication systems face challenges in generating preamble sequences that can support both legacy and new systems, particularly in multi-carrier systems like OFDM, where the length of the legacy preamble sequence may not be an integer multiple of the number of waveforms, leading to issues with time-domain characteristics when concatenating sequences of different lengths.
Innovation Solution
A method is developed to determine a value K related to the time-domain characteristic, identifying first and second preamble sequences of specific lengths, and modifying or duplicating these sequences to maintain the time-domain characteristic when concatenated, forming new preamble sequences that can be used in both legacy and new systems by adjusting the length and phase of the concatenated sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a legacy preamble sequence is used in a new system with wider bandwidth, then the legacy system compatibility is maintained, but the time-domain characteristic cannot be maintained when the sequence length is not an integer multiple of the number of waveforms
Solution Approach 1:
The new preamble sequence is segmented into multiple segments, where each segment corresponds to a legacy preamble sequence. These segments are arranged in a specific pattern (e.g., ABAB or ABCABC) to ensure that the overall sequence length becomes an integer multiple of the number of waveforms, thereby maintaining the time-domain characteristic while preserving legacy system compatibility.
Solution Approach 2:
Multiple legacy preamble sequences are merged or combined to form a new preamble sequence. By concatenating or interleaving legacy sequences in a structured manner, the new sequence achieves both legacy compatibility and the required time-domain properties for the wider bandwidth system.
2Adaptability or versatility
If the preamble sequence length is increased to support wider bandwidth, then the bandwidth scalability is improved, but the sequence length may not be an integer multiple of the number of waveforms, causing loss of time-domain characteristic
Solution Approach 1:
The structure of the new preamble sequence is designed to be dynamic and adaptable. By using patterns like ABAB or ABCABC, the sequence can flexibly adjust to different bandwidth requirements while maintaining the integer multiple relationship with the number of waveforms, thus preserving the time-domain characteristic across various bandwidth scenarios.
Solution Approach 2:
The parameters of the preamble sequence, such as its length and internal structure, are changed systematically. By modifying the sequence length to be an integer multiple of the number of waveforms and adjusting the arrangement pattern of legacy segments, the system maintains the time-domain characteristic while achieving the required bandwidth scalability.
3Productivity
If a new preamble sequence is designed for wider bandwidth, then the new system performance is improved, but compatibility with legacy systems becomes more complex
Solution Approach 1:
The new preamble sequence is designed to serve multiple functions simultaneously. It maintains compatibility with legacy systems while also supporting the new wider bandwidth system. By embedding legacy sequences in a structured pattern, the new sequence can be processed by both legacy and new systems, reducing design complexity and enhancing universality.
Solution Approach 2:
Legacy preamble sequences are copied and reused in the new preamble sequence design. By replicating legacy sequences in specific patterns (e.g., ABAB), the new sequence inherits the desirable properties of legacy sequences while achieving the required length and structure for the new system, thereby simplifying the design process and ensuring compatibility.
Data Source
AI summary
A method forms a preamble sequence in a wireless communication system. The method comprises determining a value K related to a time-domain characteristic of the wireless communication system so that a time-domain preamble sequence includes a number of K waveforms similar in shape to one another having a linear phase shift, identifying a first preamble sequence for a first band, the first preamble sequence having a first length not dividable by K, identifying at least one second preamble sequence each for a second band, the at least one second preamble sequence having at least one second length, identifying the length of a third preamble sequence, the length of the third preamble sequence equal to a sum of the first length and the at least one second length, determining whether the time-domain characteristic is maintained when the one or more of the at least one second preamble sequence is concatenated with the first preamble sequence, modifying one or more of the at least one second preamble sequence if the time-domain characteristic is not maintained when concatenated, and forming the third preamble sequence by concatenating the first preamble sequence and the at least one second preamble sequence having one or more second preamble sequence modified.