Antenna Diversity System with Inter-Chip Frame Synchronization
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Solution Overview
Problem
In mobile radio receivers, multi-path fading caused by destructive interference between direct and reflected radio frequency signals complicates signal decoding, and existing antenna diversity systems face challenges in synchronizing inter-chip communication links to enhance signal reception under weak signal conditions.
Innovation Solution
A multi-chip antenna diversity system with inter-chip communication links uses inter-chip frames synchronized by a reference clock, allowing tuner circuits to communicate effectively and reduce radiated interference through a daisy-chain configuration and 8-bit/10-bit encoding, enabling coherent signal combination and switching between antennas or frequencies based on signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple tuner circuits are used in an antenna diversity system to improve signal reception under multi-path fading conditions, then signal reliability is improved, but radiated interference between tuner circuits complicates signal reception
Solution Approach 1:
The patent introduces an inter-chip communication link as an intermediary channel between tuner circuits. This dedicated communication path allows tuners to exchange synchronization and control information without relying on radiated electromagnetic fields, thereby eliminating the harmful radiated interference while maintaining reliable signal reception through diversity combining
Solution Approach 2:
The patent replaces the electromagnetic radiation-based communication between tuner circuits with a structured digital communication system using inter-chip links. This substitution eliminates the harmful radiated interference by using controlled electrical signal transmission through defined communication pathways instead of uncontrolled electromagnetic radiation
2Adaptability or versatility
If inter-chip communication links are added to enable tuner circuits to communicate, then signal combination capability is improved, but device complexity increases
Solution Approach 1:
The inter-chip communication link serves multiple functions simultaneously: it provides synchronization between tuners, enables control signal transmission, and facilitates data exchange. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving versatile signal combination capability
Solution Approach 2:
The patent segments the communication function into standardized inter-chip link frames with defined structures. By dividing the communication protocol into discrete, manageable frames with specific fields for synchronization and control, the system achieves complex signal combination capability through modular, manageable components rather than monolithic complex circuitry
Data Source
AI summary
A tuner circuit includes circuitry to produce a first DSP frame based on a first RF signal and includes an inter-chip receiver circuit coupled to an inter-chip link and configured to receive an inter-chip frame. The inter-chip receiver circuit is configured to detect a start of frame symbol of the inter-chip frame and to extract a DSP offset and data related to a second DSP frame from the inter-chip frame. The tuner circuit further includes a digital signal processor coupled to the circuitry and to the inter-chip receiver circuit. The digital signal processor synchronizes the first DSP frame with the second DSP frame based on the start of frame symbol and the digital signal processor offset. The digital signal processor performs a selected antenna diversity operation on the first and second DSP frames to produce an output signal.