Switchable Antenna Radio Device for Multipath Interference
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Solution Overview
Problem
Cellular radio communication systems face interference issues due to multipath effects, which can lead to incorrect decoding of messages, particularly in machine-type communications where complex antenna-combining techniques are not feasible.
Innovation Solution
A radio device with two antennas and switchable receive circuitry that samples and decodes repeated data blocks from each antenna in separate time windows, achieving antenna-diversity gain without simultaneous reception, thus simplifying the circuitry and reducing size, cost, and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple receive antennas are used with simultaneous reception and complex antenna-combining techniques, then signal reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies periodic action by switching between multiple receive antennas in different time windows rather than using simultaneous reception. The radio device receives repeated data blocks from a base station, switching to different antennas for different time windows, thereby achieving diversity gain without requiring complex simultaneous processing of multiple antenna signals.
2Reliability
If multiple receive antennas with simultaneous reception are implemented, then signal reliability is improved, but device size and power consumption increase
Solution Approach 1:
The patent implements periodic action by activating different receive antennas in different time windows rather than keeping multiple antennas actively receiving simultaneously. This time-division approach allows the device to achieve antenna diversity for improved reliability while reducing power consumption, as only one antenna is actively receiving at any given moment.
3Measurement precision
If complex antenna-combining techniques are used, then decoding accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent applies periodic action by using time-division antenna switching instead of complex spatial combining techniques. The radio device receives repeated data blocks and switches between antennas in different time windows, allowing simple sequential processing rather than complex simultaneous signal combining, thereby improving ease of manufacture while maintaining decoding accuracy.
Data Source
AI summary
A radio device receives data from a base station that transmits a first radio signal, carrying a first data block, in a first time window, and a second radio signal, also carrying the first data block, in a different, second time window. The radio device comprises first and second antennas, receive circuitry, and a switch for selectively connecting the receive circuitry to the first antenna or to the second antenna. It is configured to sample the first radio signal, received by the first antenna in the first time window, to generate first sampled data; disconnect the first antenna from the receive circuitry and connect the second antenna; sample the second radio signal, received by the second antenna in the second time window, to generate second sampled data; and use both the first sampled data and the second sampled data to decode the first data block.