Low-PAPR Preamble Sequence Generation for BWA Signal Detection
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Solution Overview
Problem
Existing Broadband Wireless Access (BWA) systems face challenges in identifying Relay Stations (RS) and Base Stations (BS) due to high Peak-to-Average Power Ratio (PAPR) signals, which lead to non-linear distortion and inefficient power amplification, limiting the generation of low-PAPR preamble sequences for efficient communication.
Innovation Solution
A transmitter system that generates and selects low-PAPR preamble sequences, uses complex conjugation to create orthogonal preamble signals, and extends these patterns to enable identification and synchronization of BS and RS, preventing non-linear distortion and ensuring efficient power amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM signals are used for broadband transmission, then data transmission capability is improved, but PAPR becomes very high causing non-linear distortion
Solution Approach 1:
The patent segments the preamble signal into multiple low-PAPR preamble sequences (first, second, and third preamble sequences) with different PAPR characteristics. By using segmentation, the system can select appropriate preamble sequences for different transmission scenarios, reducing overall PAPR while maintaining data transmission capability through the remaining OFDM data portion.
Solution Approach 2:
The patent changes the PAPR parameter of the preamble sequence by selecting from multiple predefined low-PAPR sequences with different characteristics. This parameter change allows the system to optimize between PAPR reduction and synchronization performance, resolving the contradiction between low PAPR and effective node identification.
2Measurement precision
If multiple low-PAPR preamble sequences are generated, then node identification capability is improved, but system complexity increases
Solution Approach 1:
The patent makes the preamble sequence generator universal by enabling it to generate multiple types of preamble sequences (first, second, and third preamble sequences) with different PAPR characteristics using the same basic structure. This multi-functionality allows a single generator to handle various transmission scenarios without requiring separate complex generation mechanisms for each sequence type.
Solution Approach 2:
The patent performs preliminary action by pre-defining multiple low-PAPR preamble sequences before actual transmission. This allows the receiver to have ready-made reference sequences for synchronization, eliminating the need for complex real-time sequence generation and reducing overall system complexity while maintaining high node identification capability.
3Reliability
If high-PAPR signals are used for reliable transmission, then signal strength is improved, but power amplification efficiency deteriorates
Solution Approach 1:
The patent introduces dynamics by allowing the system to adaptively select different preamble sequences based on transmission requirements. The ability to switch between low-PAPR preamble sequences and adjust transmission parameters enables the system to maintain reliability while optimizing power amplification efficiency for each specific communication scenario.
Solution Approach 2:
The patent uses copying by creating multiple versions (copies) of the preamble sequence with different PAPR characteristics. By having copies with varying properties, the system can select the most appropriate copy for each transmission, achieving both reliable signal transmission and efficient power amplification without being constrained by a single fixed sequence.
Data Source
AI summary
An apparatus and method for signal detection in a Broadband Wireless Access (BWA) system are provided, in which in a transmitter, a first preamble sequence generator generates preamble sequences, a low-Peak-to-Average Power Ratio (PAPR) preamble sequence selector selects a first low-PAPR preamble sequence from among the generated preamble sequences, a preamble sequence copier copies the first low-PAPR preamble sequence at least once and outputs the first low-PAPR preamble sequence and the at least one copy, a complex conjugator generates preamble sequences orthogonal to the first low-PAPR preamble sequence and the at least one copy by calculating complex conjugates of the first low-PAPR preamble sequence and the at least one copy, and a second preamble sequence generator generates at least one second low-PAPR preamble sequence using the first low-PAPR preamble sequence.