Channel Estimation in Single Channel MIMO Systems
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Solution Overview
Problem
The deployment of multi-antenna systems in wireless communications, particularly in wireless handset devices, is limited by increased cost, complexity, and power consumption, which poses challenges for mobile system designs and applications due to the need for separate RF chains for each transmit and receive antenna.
Innovation Solution
A method and system for channel estimation in a single channel (SC) multiple-input-multiple-output (MIMO) system with two-transmit (2-Tx) and multiple-receive (M-Rx) antennas that concurrently determines propagation channel estimates using a rotation waveform to achieve channel orthogonality, reducing the need for multiple RF chains and enhancing system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple RF chains are used for each transmit and receive antenna in a MIMO system, then channel estimation accuracy and system performance are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple receive antenna signals into a single baseband combined channel estimate by applying rotation waveforms to achieve channel orthogonality. This merging approach allows the system to process multiple antenna inputs through a unified processing path rather than requiring separate RF chains for each antenna, thereby reducing device complexity while maintaining channel estimation accuracy.
Solution Approach 2:
The patent transforms the received signals by applying rotation waveforms that modify the phase and amplitude parameters of the signals. This parameter transformation enables the signals from multiple antennas to be combined constructively, achieving orthogonal channels without requiring multiple independent RF chains, thus resolving the contradiction between measurement precision and device complexity.
2Reliability
If multiple RF chains are deployed for each antenna, then signal-to-noise ratio and interference reduction are improved, but power consumption increases
Solution Approach 1:
The patent merges the signal processing functions of multiple RF chains into a single baseband processing path. By combining the signals from multiple receive antennas through rotation waveforms and producing a single baseband combined channel estimate, the system achieves the signal-to-noise ratio benefits of multiple antennas while avoiding the power consumption penalty of maintaining multiple active RF chains.
3Object-generated harmful factors
If multiple RF chains are implemented for each antenna, then channel orthogonality and interference reduction are achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple antenna inputs into a single processing path at baseband, eliminating the need for multiple separate RF chains. This merging approach achieves interference reduction through rotation waveform-based orthogonality while significantly reducing manufacturing cost by requiring fewer RF components, amplifiers, and associated hardware.
Solution Approach 2:
The patent extracts the essential function of multiple RF chains (achieving channel orthogonality and interference reduction) and implements it through a different mechanism - using rotation waveforms in the baseband processing stage. This extraction allows the system to achieve the same interference reduction benefits without the costly hardware overhead of multiple RF chains.
Data Source
AI summary
In a wireless system, a method and system for channel estimation in a single channel MIMO system comprising two-transmit and multiple-receive antennas for WCDMA/HSDPA are provided. A first receive antenna and at least one additional receive antenna may receive a plurality of SC communication signals transmitted from a first and an additional transmit antennas. Estimates of the propagation channels between transmit and receive antennas may be performed concurrently and may be determined from a baseband combined channel estimate. The integration time may be based on channel estimation accuracy and wireless modem performance. The signals received in the additional receive antennas may be multiplied by a rotation waveform to achieve channel orthogonality. The rotation waveform's amplitude and phase components may be modified based on the channel estimates. Rotation of the received signals in the additional receive antennas may be continuous or periodic.