SA Preamble PAPR Reduction via Block Cover Sequences
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high Peak to Average Power Ratio (PAPR) of Secondary Advanced (SA) preambles in Orthogonal Frequency Division Multiplexing (OFDM) wireless communication systems, particularly in IEEE 802.16m standards, poses challenges for efficient transmission and identification of cell identifiers, leading to power inefficiencies and interference issues.
Innovation Solution
The implementation of a Block Cover Sequence (BCS) designed for SA preambles, applied to each subblock, reduces PAPR by modifying bit values and using Tone Dropping (TD) to maintain consistent subcarrier intervals across varying frequency bands, thereby optimizing power distribution and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM scheme is used for high speed mobile communication, then data transmission capability is improved, but Peak to Average Power Ratio (PAPR) increases
Solution Approach 1:
The SA preamble sequence is divided into multiple subblocks, and a Block Cover Sequence (BCS) is applied to each subblock independently. This segmentation allows for localized PAPR reduction while maintaining the overall structure and identification capability of the preamble.
Solution Approach 2:
The invention modifies the bit values within each subblock by applying a BCS, which changes the amplitude parameters of the OFDM signal. This parameter modification reduces the peak power while preserving the essential synchronization and identification functions.
2Measurement precision
If SA preamble is transmitted for BS identification, then cell IDentifier (ID) distinction is improved, but PAPR increases causing power inefficiency
Solution Approach 1:
The preamble structure is segmented into subblocks with BCS applied to each, enabling energy-efficient transmission while preserving the unique identification characteristics of each cell through the maintained subblock structure.
Solution Approach 2:
Different BCS patterns can be applied to different subblocks, allowing local optimization of power efficiency while maintaining the global identification function. Each subblock can be independently optimized without affecting the overall BS identification capability.
3Adaptability or versatility
If Tone Dropping (TD) is used to maintain consistent subcarrier intervals, then frequency band adaptability is improved, but system complexity increases
Solution Approach 1:
The BCS application method works universally across different frequency bands and OFDM configurations. The same subblock segmentation and BCS application procedure can be used regardless of the specific frequency band or subcarrier interval, providing a universal solution that adapts to various system configurations without requiring complex band-specific processing.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An apparatus and method for reducing a Peak to Average Power Ratio (PAPR) of a Secondary Advanced (SA) preamble in a wireless communication system are provided. A method for transmitting an SA preamble includes determining an SA preamble, constructed in a unit of subblocks, according to a frequency band to be used for transmitting information, determining a sequence for reducing a PAPR of the SA preamble in consideration of at least one of a frequency band, a segment IDentifier (ID), and the number of antennas transmitting the SA preamble, updating the SA preamble using the determined sequence, and transmitting the updated SA preamble to a receive end.