Bidirectional Transceiver Phase Optimization for High-Speed Links
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Solution Overview
Problem
Conventional bi-directional transceiver systems face inefficiencies in high-speed communication due to noise introduction from fast slew rate transitions, leading to sub-optimal sampling and high error rates, especially when trying to cancel own transmissions while maintaining optimal reception of signals from the other end.
Innovation Solution
Implementing a phase optimizing simultaneous bidirectional link that provides two degrees of freedom: controlling the timing between the sampling clock phase and the received signal, and shifting the transmit transitions away from the optimal receiver sampling time, using relative delay units to minimize cancellation errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sampling phase is shifted to move away from transitions in the locally transmitted signal, then noise from fast slew rate transitions is reduced, but the sampling becomes sub-optimal resulting in high error rates
Solution Approach 1:
The patent implements dynamic phase adjustment mechanisms that allow the sampling phase to be optimized independently from the transmitted signal phase. The system dynamically adjusts the sampling clock phase based on detected transition timing of the locally transmitted signal, enabling the receiver to adaptively position sampling instances away from high-slew-rate transitions while maintaining optimal sampling of the received signal.
Solution Approach 2:
The patent separates the phase control into two independent components: the transmitted signal phase and the sampling clock phase. This segmentation allows independent optimization of each - the transmitted signal maintains its symbol timing while the sampling clock is independently adjusted to avoid transition regions, resolving the contradiction between noise reduction and sampling optimality.
2Reliability
If separate frequency channels are used for simultaneous bi-directional communication, then transmit and receive spectrums do not overlap and can be properly filtered, but half or more of the total available channel bandwidth is wasted
Solution Approach 1:
The patent merges the transmit and receive operations into a single frequency channel by implementing full-duplex communication at the same carrier frequency. The system combines self-interference cancellation techniques with phase optimization to enable simultaneous transmission and reception on the same frequency, eliminating the need for frequency separation and achieving 100% bandwidth utilization.
Solution Approach 2:
The patent converts the harmful self-interference from the local transmitter into a manageable signal by generating an accurate replica of the transmitted signal and subtracting it from the received signal. This transforms the interference problem into a solvable mathematical operation, enabling frequency-reuse and doubling the effective channel capacity.
3Reliability
If separate communication channels are used for simultaneous bi-directional transmission, then transmission in opposite directions can be isolated, but available channel capacity in the opposite direction remains unused
Solution Approach 1:
The patent merges bidirectional communication into a single shared channel by implementing full-duplex operation. The system combines self-interference cancellation with phase optimization techniques to enable both directions to transmit simultaneously on the same channel, effectively doubling the productivity and capacity utilization compared to half-duplex separate channels.
Data Source
AI summary
A bidirectional transceiver includes a transmitter and a receiver that respectively transmits a local signal to and receives remote signal from a common bidirectional communication channel, thus the bidirectional channel signal is the superimposition of the local and remote signals. The bidirectional transceiver also includes a transmit canceller that substantially removes the local transmitted signal from the superimposed signals on the bidirectional channel before the local receiver. The remote signal is transmitted by a remote transceiver over the bidirectional channel. A sampling phase is set, based on timing information in the received remote signal, and the received signal is sampled. Timing relation of transitions in the local transmit signal relative to the receiver sampling phase is set such that transmit signal cancellation is optimum at receiver sampling phase, by changing the delay applied to the local transmit signal. To keep the timing relation of the local transmit signal relative to the remote transceiver, a second delay is applied to the local transmit signal before transmission into the bidirectional channel that provides a delay substantially same as the first delay but opposite in direction.