OFDM Broadcast Channel Puncturing for Power Consistency
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Solution Overview
Problem
In Orthogonal Frequency Division Multiplexing (OFDM) systems, the power allocation to data tones is often lower in symbols containing Reference Symbols (RSs) due to prioritization of RS power, leading to inconsistent transmit power levels across OFDM symbols, which can degrade system performance and reception quality.
Innovation Solution
The method involves Resource Element (RE) puncturing based on RS power allocation, where the power sum of every OFDM symbol is kept below a maximum by transmitting no data in parts of the data tones with RSs, ensuring equal data tone power levels across all symbols, and explicitly or implicitly notifying RE puncturing information through specific channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RS power is prioritized in OFDM symbols containing Reference Symbols, then channel estimation accuracy is improved, but data tone power levels become inconsistent across symbols
Solution Approach 1:
The patent extracts data tones from OFDM symbols containing RSs by applying RE puncturing. Specifically, data tones that would interfere with RS positions are removed (set to zero power), separating the RS transmission from data transmission in those symbols. This resolves the power allocation conflict by eliminating the overlapping resource elements.
Solution Approach 2:
The patent applies RE puncturing patterns in advance before transmitting data in OFDM symbols containing RSs. The puncturing pattern pre-identifies and removes data tones that would conflict with RS positions, ensuring that when RSs are transmitted with higher power, the data tones remaining in those symbols maintain consistent power levels with other symbols.
2Stability of the object's composition
If RE puncturing is applied to maintain equal data tone power levels, then power consistency is improved, but transmission efficiency decreases
Solution Approach 1:
The patent applies RE puncturing selectively rather than uniformly across all OFDM symbols. The puncturing pattern is designed to remove only the specific data tones that would interfere with RS positions in symbols containing RSs, while leaving data tones intact in symbols without RSs. This localized approach maintains power consistency where needed without unnecessarily reducing transmission efficiency elsewhere.
3Reliability
If puncturing information is explicitly notified through broadcast channels, then reception reliability is improved, but system complexity increases
Solution Approach 1:
The patent uses broadcast channels as an intermediary to convey RE puncturing pattern information from the base station to user equipment. The puncturing pattern information is embedded in system broadcast messages, allowing receivers to correctly interpret the transmitted signal structure without requiring complex real-time negotiation or signaling overhead for each transmission.
Data Source
AI summary
A method and apparatus for transmitting and receiving data in an Orthogonal Frequency Division Multiplexing (OFDM) system are provided, in which a Base Station (BS) generates a signal of a broadcast channel, determines whether the broadcast channel signal includes Reference Symbols (RSs) used for channel estimation, determines to apply a maximal puncturing pattern to a Resource Block that defines the broadcast channel, if the broadcast channel signal includes Rs, includes puncturing information about a downlink signal in the broadcast channel signal, maps the broadcast channel signal including the puncturing information to Resource Elements according to the maximal puncturing pattern, and transmits the mapped broadcast channel signal.