Incoherent Data Symbol Detection for Low-Power WPAN Receivers
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Solution Overview
Problem
Existing data transmission methods in WPANs, such as IEEE 802.15.4, face high realization costs and power consumption due to complex carrier control circuits and high-rate signal processing, especially in environments with interference and noise.
Innovation Solution
An incoherent detection method that converts received radio signals into complex baseband signals sampled in the chip clock, performs differential demodulation, and correlates demodulated signals with derived sequences to detect data symbols, eliminating the need for carrier phase control and high-rate processing, thereby reducing power consumption and implementation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent detection with carrier control circuit and high-rate complex matched filtering is used, then detection accuracy is improved, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent extracts and eliminates the carrier control circuit from the coherent detection system, using only in-phase and quadrature component generation without requiring carrier phase and frequency control. This removes the complex matched filtering requirement while maintaining detection capability through direct correlation with local PN sequences.
Solution Approach 2:
The patent replaces expensive, complex coherent detection hardware with simpler, lower-cost incoherent detection components that perform correlation-based detection without requiring precision carrier synchronization, thereby reducing overall system complexity and power consumption.
2Measurement precision
If coherent detection with high-rate complex matched filtering is used, then detection accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The patent removes the power-intensive carrier control circuit and high-rate complex matched filtering operations, replacing them with simpler correlation-based detection that operates at lower computational rates and consumes significantly less power while maintaining adequate detection accuracy.
Solution Approach 2:
The patent changes the detection approach from high-rate complex filtering to correlation-based detection with integrated decision-making, operating at symbol rate rather than chip rate, thereby reducing computational power requirements while maintaining detection performance.
3Device complexity
If incoherent detection without carrier phase control is used, then device complexity and power consumption are reduced, but detection performance may deteriorate in noisy conditions
Solution Approach 1:
The patent merges the detection and decision-making functions into a unified correlation-based process that directly evaluates in-phase and quadrature components against local PN sequences and makes symbol decisions based on combined magnitude comparison, eliminating the need for separate carrier phase control while maintaining robustness against noise and interference.
Data Source
AI summary
A method and device is provided for detecting data symbols in a received radio signal. Each data symbol is allocated transmit-side a symbol value-specific PN sequence of successive PN chips in the chip clock, and the allocated PN sequences are offset QPSK modulated. The method for incoherent detection includes converting the received radio signal into a complex baseband signal sampled in the chip clock, generating a demodulated signal by differential demodulation of the complex baseband signal, calculating correlation results by correlating the demodulated signal with the derived sequences, and deriving the values of the data symbols by evaluating the correlation results. Each derived sequence is assigned to a PN sequence allocable transmit-side and includes derived chips, whose values correspond to a logic linking of particular PN chips of the PN sequence allocable transmit-side that is assigned the derived sequence. The invention relates furthermore to a corresponding receiving unit.