Shared Observation Receiver for Digital Pre-Distortion in TDD Radios

Solution Overview

Problem

In time division duplexing (TDD) protocols used in LTE wireless systems, the idle periods of data path receivers increase the cost of RF shelves as each antenna requires separate data and observation receivers, leading to inefficiencies.

Innovation Solution

A system that time-shares a single receiver between the data receiver and observation path receiver, allowing for cost reduction by multiplexing the RF receiver chain, which is applicable in both TDD and frequency division duplexing (FDD) systems, using a broadband or dual-band receiver to cover both transmission and receive frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate data receiver and observation receiver are used for each antenna, then the reliability of receiving both data signals and transmission signals is improved, but the device complexity and cost increase

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidreceiver chain complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the data receiver and observation receiver into a single shared receiver unit. The receiver is configured to selectively operate in either data reception mode or transmission signal observation mode, eliminating the need for separate receiver chains while maintaining the functional requirements of both reception paths.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared receiver is designed with multi-functionality to perform both data reception and transmission signal observation tasks. By implementing a universal receiver that can adapt its operation mode based on timing signals, the system achieves the reliability of separate receivers without their complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If separate data receiver and observation receiver are used for each antenna, then the signal reception function is ensured, but the manufacturing cost increases

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines the data receiver and observation receiver into a single shared receiver unit. The receiver is configured to selectively operate in either data reception mode or transmission signal observation mode, eliminating the need for separate receiver chains while maintaining the functional requirements of both reception paths.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared receiver is designed with multi-functionality to perform both data reception and transmission signal observation tasks. By implementing a universal receiver that can adapt its operation mode based on timing signals, the system achieves the reliability of separate receivers without their complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If separate data receiver and observation receiver are used for each antenna, then the signal processing capability is improved, but the power consumption increases

Engineering Contradiction:

Improvesignal processing capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The shared receiver operates in periodic time-division manner, alternating between data reception periods and transmission signal observation periods. This periodic switching allows the receiver to be active only when needed for each function, reducing overall power consumption compared to having continuously active separate receivers.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent combines the data receiver and observation receiver into a single shared receiver unit. The receiver is configured to selectively operate in either data reception mode or transmission signal observation mode, eliminating the need for separate receiver chains while maintaining the functional requirements of both reception paths.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9337886B1Digital pre-distortion with shared observation path receiver

Publication Date: 2016.05.10 XILINX INC

AI summary

A system for digital pre-distortion includes: a transmitter configured to transmit at least one transmission data signal; a receiver configured to receive at least one receive data signal and to receive the at least one transmission data signal; and at least one amplifier, associated with the transmitter, configured to receive at least one pre-distortion control signal sent from the receiver; wherein the at least one pre-distortion control signal is related to the at least one transmission data signal.