Interference Rejection Filter for Wireless Signal Throughput
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Solution Overview
Problem
Despite the performance improvements enabled by SIMO and MIMO systems, interference in data signals received by wireless communication devices significantly impacts throughput and reliability, particularly due to co-channel interference from overlapping basic service sets and hidden nodes.
Innovation Solution
The implementation of an interference rejection filter in receiving devices that uses an explicit sounding method to determine a full-dimensional channel estimate based on training signal sets transmitted from interference sources, allowing for effective suppression of interference by filtering the received data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SIMO and MIMO technologies are used to increase data throughput and link range, then throughput and link range are improved, but interference from co-channel overlapping basic service sets and hidden nodes significantly impacts throughput and reliability
Solution Approach 1:
The system performs preliminary channel estimation using training signals before actual data transmission. The receiving device obtains channel state information through sounding packets and training sequences, allowing it to pre-compute interference rejection filters that will be applied during data reception, thereby proactively mitigating interference impacts on reliability
Solution Approach 2:
The patent introduces channel estimation and interference rejection filtering as intermediary processing steps between signal reception and data decoding. By inserting these intermediate processing stages that use training signals to characterize the channel and compute rejection filters, the system能够有效分离 desired signals from interference, resolving the contradiction between maintaining high throughput and ensuring reliable transmission
2Productivity
If multiple receive antennas are used in SIMO and MIMO systems, then data throughput and link range are enhanced, but the complexity of interference suppression increases
Solution Approach 1:
The patent segments the interference suppression process into distinct functional blocks: channel estimation block that processes training signals separately, filter computation block that generates interference rejection filters, and filtering block that applies these filters to received signals. This segmentation of the receiving device into specialized modules makes the complex interference suppression task more manageable and implementable while maintaining high throughput performance
3Measurement precision
If channel estimation is performed using training signal sets from multiple transmit antennas, then interference suppression accuracy is improved, but the amount of training data and processing requirements increase
Solution Approach 1:
The training signal sets serve multiple functions: they enable channel estimation for all n transmit antennas simultaneously, provide data for computing interference rejection filters, and characterize the complete MIMO channel matrix. This multi-functionality of the training signals allows the system to achieve high measurement precision for channel estimation without proportionally increasing training data volume, as the same training data is reused across multiple processing objectives
Data Source
AI summary
Receiving devices and methods for suppressing interference from a data signal received at a receiving device are provided. The receiving device has m receive antennas. A training signal set transmitted from a first transmitting device is received at the receiving device. The training signal set includes (i) data for each transmit antenna of n transmit antennas included on the first transmitting device and (ii) information sufficient to determine a channel estimate corresponding to a communication channel between the first transmitting device and the receiving device. The channel estimate is determined based on the training signal set. The channel estimate includes an m-by-n description of the communication channel. The data signal received at the receiving device is filtered based on the channel estimate to suppress the interference in the data signal. The data signal is transmitted from a second transmitting device different from the first transmitting device.