MIMO Transceiver Adaptive Modulation via Per-Path Error Detection
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Solution Overview
Problem
Existing adaptive modulation technologies are inadequate for MIMO communication systems using multiple antennas, as they fail to precisely adjust modulation parameters for each signal path, leading to suboptimal communication quality and interference management.
Innovation Solution
A transceiver system that estimates channel conditions and error detection for each signal path, allowing for dynamic adjustment of the number of modulation levels, encoding rate, and the number of signals transmitted, thereby optimizing transmission rates and reducing interference across multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adaptive modulation is applied using a single antenna pair, then transmission rate can be adjusted according to channel conditions, but communication quality deteriorates when Doppler change or interference occurs
Solution Approach 1:
The patent divides the MIMO system into multiple independent signal paths (space paths) corresponding to different antenna pairs. Each path is independently monitored for errors and adjusted separately, allowing the system to maintain high transmission rates on good paths while reducing rates only on degraded paths, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent applies different modulation and transmission rate settings to each signal path based on its specific channel conditions. Instead of uniform adaptation across all paths, each path receives localized quality control tailored to its Doppler characteristics and error rates, enabling optimized performance for each individual path while maintaining overall system reliability.
2Productivity
If multiple signals are transmitted simultaneously using multiple antennas, then communication speed increases, but interference between paths increases
Solution Approach 1:
The patent implements feedback mechanisms where error detection results and channel quality information from each signal path are fed back to the transmission rate determining unit. This feedback enables dynamic adjustment of transmission rates and modulation parameters for each path, allowing the system to maintain high communication speed through parallel transmission while managing interference by reducing rates on interfered paths.
Solution Approach 2:
The patent dynamically adjusts the number of transmitted signals and transmission rates based on real-time channel conditions. When interference is detected on certain paths, the system dynamically reconfigures the active paths and their modulation parameters, transforming the static multiple-signal transmission into a dynamic adaptive system that balances speed and interference management.
3Speed
If transmission rate is determined based on estimated SINR only, then determination speed is fast, but precision of transmission rate determination is insufficient
Solution Approach 1:
The patent performs preliminary error detection and channel estimation for each signal path before final transmission rate determination. By pre-processing the channel state information and error rates, the system can quickly determine appropriate transmission rates without sacrificing precision, as the preliminary actions provide ready-to-use data for accurate rate selection.
Solution Approach 2:
The patent changes the parameters used for transmission rate determination from relying solely on estimated SINR to incorporating multiple parameters including actual error rates, channel estimation results, and signal path characteristics. This parameter expansion maintains determination speed while significantly improving precision by using more comprehensive quality metrics.
Data Source
AI summary
A transceiver of a MIMO method communication system, and a transmitting-receiving method thereof are disclosed. The transceiver includes one or more antennas for receiving two or more signals transmitted using two or more transmission antennas, a channel estimating unit for estimating a channel of each of the signals, an error detecting unit for performing error detection of each signal based on reliability information added to the signal, and for determining a transmission rate of the signals based on at least one of the channel estimation result and the error detection result of each signal, and a transmission rate determining unit for adjusting the number of signals to be transmitted from the transmission antennas at a predetermined interval.