Power Multiplexed RF Signal Processing for High Data Rates
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Solution Overview
Problem
Current radiofrequency signal transmission systems face limitations in achieving high data rates due to interference and distortion, particularly in using multiple antennas with large spacing constraints and inefficient bandwidth allocation.
Innovation Solution
The system employs power multiplexing by transmitting two streams with differentiated power levels over a common bandwidth, using a single antenna configuration, where the receiver processes the combined signal to recover both streams through distortion compensation and cancellation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO techniques are used to increase data rates, then data rate is improved, but antenna spacing requirements increase
Solution Approach 1:
The patent combines multiple data streams into a single radio frequency channel by superimposing them with different power levels. The first stream is transmitted at a higher power level while the second stream is transmitted at a lower power level, allowing both streams to share the same antenna and frequency resource without requiring multiple physically separated antennas.
Solution Approach 2:
The patent changes the power level parameter of different streams to enable their simultaneous transmission over a common channel. By assigning different power levels (first power level > second power level) to different streams, the system can distinguish and separately recover the streams at the receiver end, effectively increasing data rate without increasing antenna spacing.
2Productivity
If multiple streams are transmitted over a common channel, then bandwidth usage is optimized, but signal interference increases
Solution Approach 1:
The patent applies different power levels to different streams within the same channel, creating a hierarchical structure where the first stream (higher power) and second stream (lower power) can be distinguished. This local differentiation in power quality allows the receiver to separately process and recover each stream despite their coexistence in the same bandwidth, reducing effective interference between streams.
3Productivity
If power multiplexing is used to transmit multiple streams, then data rate increases, but distortion compensation complexity increases
Solution Approach 1:
The patent applies distortion compensation techniques in advance during the signal processing chain. By pre-compensating for non-linear distortions introduced by power amplifiers and other components, the system reduces the burden on subsequent recovery stages and improves the overall accuracy of stream separation and recovery, making the complex power multiplexing scheme more robust.
Data Source
AI summary
There is set forth herein, in one embodiment, obtaining with a radiofrequency receiver a combined radiofrequency signal having a first stream combined with a second stream, wherein the first stream has a first power level, and wherein the second stream has a second power level, the first power level of the first stream being greater than the second power level of the second stream, wherein the radiofrequency receiver includes one or more antenna; processing the combined radiofrequency signal to recover a first digital bitstream associated to the first stream; and recovering a digital bitstream associated to the second stream using the first digital bitstream.