Phase Modulated Synchronization Sequences for LTE Information Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for configuring synchronization channels in wireless communication systems, such as LTE and IEEE 802.16, face limitations in efficiently transmitting diverse information sets, particularly in maintaining synchronization and managing peak-to-average power ratio (PAPR), which affects channel estimation and network performance.
Innovation Solution
The proposed method involves generating sequences with excellent characteristics, such as CAZAC, Hadamard, M-sequence, and PN sequences, and applying phase modulation to synchronization channels to include additional information like control signals, frequency hopping options, and antenna configuration, thereby enhancing the capacity and accuracy of information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional synchronization channel configuration methods are used, then the system structure remains simple, but the capacity to transmit diverse information sets is limited
Solution Approach 1:
The patent applies parameter changes by modifying the sequence structure through phase modulation. Specifically, it modulates phases of composite sequences (formed by multiplying first and second sequences) to encode additional information bits. This allows the synchronization channel to transmit more information (increasing information capacity) while maintaining the existing sequence generation framework (avoiding excessive complexity increase).
Solution Approach 2:
The patent makes the synchronization channel multi-functional by enabling it to simultaneously perform synchronization and transmit diverse information sets. The composite sequence structure with phase modulation allows the same channel to convey both timing synchronization information and additional data such as cell ID, frame number, or other control information, thereby increasing information transmission capacity without requiring separate dedicated channels for each function.
2Quantity of substance
If more information is transmitted through synchronization channels, then information capacity increases, but PAPR management becomes more difficult
Solution Approach 1:
The patent manages PAPR by carefully controlling the phase modulation parameters. Instead of using complex modulation schemes that would increase peak power, it applies phase modulation to composite sequences in a way that maintains relatively constant amplitude. The phase changes are designed to encode information while minimizing power fluctuations, thus increasing information capacity without significantly worsening PAPR management.
Solution Approach 2:
The patent uses composite sequences formed by multiplying a first sequence and a second sequence. This composite structure allows the system to leverage the properties of both constituent sequences while embedding additional information through phase modulation. The composite nature provides flexibility in information encoding while maintaining good correlation properties and manageable PAPR characteristics.
3Loss of information
If phase modulation is applied to sequences, then additional information can be transmitted, but sequence generation complexity increases
Solution Approach 1:
The patent segments the information transmission process by using separate first and second sequences that are multiplied together. The first sequence can be used for synchronization while the second sequence carries additional information through phase modulation. This segmentation allows the system to process and generate sequences in a modular fashion, reducing the overall complexity compared to generating entirely new complex sequences from scratch.
Solution Approach 2:
The patent performs preliminary sequence generation by creating the first and second sequences separately before combining them through multiplication and phase modulation. This preliminary action allows each sequence to be optimized independently for its specific function, simplifying the overall generation process. The base sequences can be pre-computed or pre-stored, reducing real-time processing complexity when additional information needs to be transmitted.
Data Source
AI summary
A method for transmitting information using a sequence is disclosed. According to an embodiment, the method includes the steps of generating a sequence for transmitting data or control signals, performing phase modulation for indicating additional information on partial elements among a plurality of elements configuring the sequence, and transmitting the phase modulated sequence.