MIMO Receiver Time-Frequency MRC Architecture
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Solution Overview
Problem
Conventional 802.11a/g modem receivers fail to achieve maximum data rates due to multi-path channel conditions, and existing multi-input multi-output (MIMO) receiver designs either incur high costs or do not effectively combine signals in both time and frequency domains, limiting their performance.
Innovation Solution
A MIMO receiver architecture that employs a synchronization module for generating maximum ratio combining (MRC) parameters to align and process both complementary code keying (CCK) and orthogonal frequency division multiplexing (OFDM) signals in time and frequency domains, respectively, to improve signal reception and demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional maximum antenna approach is used, then implementation cost is reduced, but data reception rate and signal quality deteriorate under multi-path channel conditions
Solution Approach 1:
The patent merges time-domain CCK signal processing with frequency-domain OFDM signal processing into a unified MIMO receiver architecture. The receiver combines multiple antenna signals through maximum ratio combining in both time and frequency domains, integrating CCK and OFDM processing paths to achieve optimal signal reception under multi-path conditions while maintaining cost-effectiveness.
2Ease of operation
If all time domain design is used, then CCK signal processing is simplified, but frequency domain combining advantage is lost and silicon die area increases
Solution Approach 1:
The patent segments the signal processing into distinct time-domain CCK processing paths and frequency-domain OFDM processing paths. The receiver includes separate CCK processing modules and OFDM processing modules that operate independently but are coordinated through a common MRC controller, allowing each domain to be optimized separately while reducing overall hardware footprint.
3Productivity
If frequency domain only design is used, then OFDM reception is optimized, but CCK receiving performance does not improve
Solution Approach 1:
The patent creates a universal MIMO receiver architecture that handles both CCK and OFDM signal types through a unified maximum ratio combining framework. The receiver includes multiple antenna elements with common MRC controllers that can process both CCK-modulated and OFDM-modulated signals, allowing the same hardware to optimize for both signal types simultaneously rather than requiring separate dedicated receivers.
Data Source
AI summary
A multi input multi output (MIMO) receiver for receiving signals having a synchronization (SYNC) module being responsive to a plurality of received baseband signals for processing the same to generate maximum ratio combining (MRC) parameters, complementary code keying (CCK) modulated signals and orthogonal frequency division multiplexing (OFDM) modulated signals, said SYNC module for using said MRC parameters to process said OFDM modulated signals to generate a plurality of aligned OFDM signals in time domain, said MIMO receiver for processing said plurality of aligned OFDM signals to generate a plurality of subcarriers, in accordance with an embodiment of the present invention. The MIMO receiver further including a time domain CCK MRC module being responsive to said MRC parameters for processing said CCK modulated signals in time domain to generate aligned signals, said aligned signals being combined to generate an adjusted signal for demodulation. The MIMO receiver further including a frequency domain OFDM MRC module being responsive to said plurality of said subcarriers for combining the same in the frequency domain to generate an equalized response for demodulation, wherein said MIMO receiver for processing said CCK modulated signals in the time domain and said OFDM modulated signals in the frequency domain to improve the reception of said plurality of received baseband signals.