Padded Zadoff-Chu Code Sequence for Wireless Detection
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Solution Overview
Problem
In wireless communication environments using OFDM technology, the Zadoff-Chu code sequence does not perform optimally with differential detection, lacking zero cross-correlation when transmitted.
Innovation Solution
A padded code sequence is generated with the last symbol duplicating the first symbol, transmitted over multiple sub-carriers using multiple antennas, maintaining orthogonality and enhancing code properties for improved detection probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Zadoff-Chu code sequence is transmitted using conventional OFDM technology, then transmission can be performed with standard modulation and mapping, but the code sequence does not achieve zero cross-correlation with differential detection
Solution Approach 1:
The code sequence is segmented into multiple groups where each group contains multiple code sequences. This segmentation allows differential detection to be applied group-by-group, enabling the system to achieve zero cross-correlation properties while maintaining compatibility with conventional OFDM transmission frameworks
Solution Approach 2:
Differential encoding is performed preliminarily on the code sequences before transmission. The transmitter applies differential encoding to generate encoded code sequences that inherently possess zero cross-correlation properties, ensuring that the detection probability is improved before the signal even reaches the receiver
2Reliability
If conventional OFDM transmission is used without code sequence extension, then transmission simplicity is maintained, but detection performance is suboptimal
Solution Approach 1:
The invention nests multiple levels of structure within the transmission framework: code sequences are nested within groups, groups are nested within resource blocks, and multiple resource blocks are nested within the overall transmission frame. This nested structure allows complex detection improvements while maintaining a relatively simple overall transmission architecture that builds upon conventional OFDM
Solution Approach 2:
The invention extends the code sequence into the time dimension by creating multiple groups of code sequences transmitted at different time intervals. This temporal dimensionality addition allows differential detection to operate effectively across multiple time instances, improving detection performance without fundamentally altering the frequency-domain OFDM structure
Data Source
AI summary
A transmitter for transmitting signals to a receiver is provided. The transmitter generates a padded code sequence including a plurality of symbols with the last symbol being a duplication of the first symbol, and transmit the padded code sequence with the symbols therein respectively corresponding to a plurality of first sub-carriers to the receiver via an air interface using a first antenna in a time period. Also, the transmitter duplicates the padded code sequence and transmits the duplicated padded code sequence with the symbols therein respectively corresponding to a plurality of second sub-carriers to the receiver via the air interface using a second antenna in the time period.