Baseband Chip Demodulation Buffer Space Optimization
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Solution Overview
Problem
Existing methods for demodulating downlink channels in TD-LTE systems require significant memory space in baseband chips due to the need to cache multiple OFDM symbols and corresponding channel estimation data, which is inefficient and occupies a lot of buffer space.
Innovation Solution
A method and apparatus that successively obtain and demodulate RE data from OFDM symbols, filling demodulated data into corresponding positions in the buffer, allowing only one OFDM symbol and its matching CHE data to be cached, thereby reducing memory usage by obtaining and processing RE data from multiple symbols one by one.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple OFDM symbols and corresponding CHE data are cached to demodulate PDCCH, then demodulation can be performed, but memory space occupation increases significantly
Solution Approach 1:
The patent segments the PDCCH data across multiple OFDM symbols and processes them sequentially rather than caching all symbols simultaneously. The receiver obtains RE data from OFDM symbols one by one, demodulates each symbol's data, and fills demodulated data into the buffer sequentially, reducing the simultaneous memory requirement from storing all N symbols to storing only one symbol at a time.
Solution Approach 2:
The patent performs preliminary actions by pre-defining the mapping relationship between RE data positions in OFDM symbols and buffer positions, and by pre-establishing the sequential processing order. This allows the system to process OFDM symbols in sequence without needing to cache all symbols simultaneously, as the buffer allocation and processing order are predetermined.
2Volume of stationary object
If RE data are obtained and processed sequentially from multiple OFDM symbols, then memory space is reduced, but processing time may increase
Solution Approach 1:
The patent maintains continuous processing by sequentially obtaining RE data from multiple OFDM symbols, demodulating each symbol's data, and filling the buffer without interruption. The receiver continuously processes OFDM symbols in sequence, ensuring that the demodulation process remains active and efficient, avoiding idle waiting time that would occur if data needed to be re-fetched from storage.
Data Source
AI summary
The present disclosure provides a method and an apparatus for demodulating a downlink channel in a communication system, and a baseband chip. The demodulation method may include: obtaining RE data corresponding to the downlink channel successively from an OFDM symbol; demodulating the RE data to obtain demodulated data; filling the demodulated data to a corresponding position in a downlink channel buffer; and proceeding to obtain RE data corresponding to the downlink channel successively from a next OFDM symbol if a sequence number of the OFDM symbol does not reach a predetermined number. The present disclosure saves buffer space of the baseband chip in a UE.