Partial Bit Pseudo-Randomization for Scheduling-Free Transmission
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Solution Overview
Problem
Existing communication methods face challenges in scheduling free transmission due to uncertainty in user detection, leading to high decoding complexity and reduced demodulation performance, especially in scenarios where users randomly select transmission signatures or reference signals, resulting in channel estimation inaccuracies and residual interference.
Innovation Solution
A partial pseudo-randomization processing method is applied, where only part of the bit sequence is pseudo-randomized and encoded, with the remaining bits processed in a manner agreed upon with the receiving side, followed by encoding, and on the receiving side, the decoded bits undergo partial pseudo-randomization removal to recover the original sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full pseudo-randomization processing is applied to all bits before encoding, then interference randomization is improved, but encoding and decoding complexity increases significantly
Solution Approach 1:
The patent divides the bit sequence into multiple segments and applies pseudo-randomization processing to only certain segments (e.g., data bits) while leaving other segments (e.g., pilot bits or specific position bits) unprocessed or processed differently. This segmentation allows the system to achieve interference randomization where needed while avoiding the complexity of processing all bits, thus resolving the contradiction between reliability improvement and complexity reduction.
2Measurement precision
If scrambling code is determined before FEC decoding, then demodulation performance is improved, but user detection uncertainty causes performance degradation
Solution Approach 1:
The patent performs preliminary pseudo-randomization processing on the bit sequence before encoding and channel transmission. The receiving end can perform corresponding preliminary processing (such as partial descrambling) before FEC decoding based on preliminary user detection results. This preliminary action allows the system to improve demodulation performance while accommodating the uncertainty in user detection, as the preliminary processing can be adjusted or refined after initial detection.
3Stability of the object's composition
If all bits are processed with pseudo-randomization, then bit sequence randomness is improved, but channel estimation precision is reduced due to increased residual error
Solution Approach 1:
The patent applies different processing qualities to different parts of the bit sequence. Specifically, pseudo-randomization processing is applied to data bits to improve randomness and interference randomization, while pilot bits or specific reference bits are either left unprocessed or processed with different parameters to maintain their quality for accurate channel estimation. This local differentiation of processing quality resolves the contradiction between improving bit sequence randomness and maintaining channel estimation precision.
Data Source
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AI summary
Provided are a partial pseudo-randomization processing method, a corresponding apparatus, a device and a storage medium. The method includes performing pseudo-randomization processing on part of N bits b1,b2,...,bN to generate new N bits d1,d2,...,dN; and encoding the d1,d2,...,dN. On the premise of ensuring the interference randomization effect, the performance of scheduling-free transmission can be effectively improved, the complexity of encoding and decoding in the scheduling-free transmission can be effectively reduced, and the demodulation performance can be effectively improved.