OFDM Burst Signal Synchronization Using One-Bit Quantization
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Solution Overview
Problem
Existing synchronizer systems for burst or packet transmission in OFDM are complex and costly to implement, particularly in hardware, and are affected by noise and signal attenuation, making them inefficient for synchronization.
Innovation Solution
A method and apparatus for synchronizing a burst signal with a known sequence using correlation units to generate correlated signals based on the real and imaginary parts of both the input signal and the coefficient sequence, with a criterion-matching unit determining synchronization, employing a quantization bit and exclusive OR operations to simplify hardware implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multipliers are used for signal correlation in synchronizer, then synchronization accuracy can be maintained, but hardware cost and implementation complexity increase significantly
Solution Approach 1:
The patent changes the parameter representation from full-precision complex multiplication to one-bit quantization based on signum functions. By transforming the correlation operation to use only sign bits of real and imaginary components, the system achieves synchronization with reduced hardware complexity while maintaining functional accuracy for detection purposes.
Solution Approach 2:
The patent replaces expensive multiplier hardware with simple XOR operations and signum function evaluations. This substitution uses computationally inexpensive operations that can be implemented with basic logic gates, dramatically reducing hardware cost and complexity while sufficient for synchronization detection.
2Measurement precision
If full-precision correlation computation is performed, then measurement precision is improved, but computational complexity and processing overhead increase
Solution Approach 1:
The patent applies partial action by using only the signum (sign bit) of the real and imaginary components rather than full-precision values. This one-bit quantization provides sufficient information for synchronization detection without the computational burden of complete correlation computation, achieving adequate precision for the application.
Solution Approach 2:
The patent transforms the correlation parameter from full-precision complex values to one-bit quantized signum values. This parameter change simplifies the computational requirements while maintaining the essential correlation functionality needed for synchronization, reducing processing overhead significantly.
3Device complexity
If quantization and one-bit representation are used, then hardware cost is reduced, but susceptibility to noise and signal variations increases
Solution Approach 1:
The patent converts the potential harm of quantization noise into a benefit by using the signum function's inherent noise immunity. The signum operation provides robustness against amplitude variations and noise, as it only depends on the sign of the signal components rather than their precise magnitude, thereby improving reliability in noisy environments.
Solution Approach 2:
The patent changes the signal representation parameter to one-bit quantization based on signum functions, which inherently provides better noise resistance. This parameter transformation makes the synchronization process more robust to amplitude fading and noise by focusing on phase information through sign bits rather than magnitude.
Data Source
AI summary
A method and apparatus is disclosed for performing a synchronization of an incoming series of complex samples of an incoming signal with a known sequence of a plurality of coefficients which represents a pattern within the incoming signal, known to the synchronizer, where the synchronization is performed using a plurality of cross-correlations units.