Multi-antenna Base Station Phase Compensation for Coherent Combining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional GSM systems using multiple antennas for transmit diversity face challenges in achieving 100% coherent combining gain, limiting the expansion of coverage and reliability.
Innovation Solution
A signal transmission method and apparatus for a multi-antenna base station that calculates and applies a phase compensation value based on signal reception status information from terminals, enabling coherent combining of transmit signals across multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are used for transmit diversity in conventional GSM systems, then coverage range and reliability are improved, but coherent combining gain cannot reach 100% due to lack of phase synchronization
Solution Approach 1:
The patent implements a feedback mechanism where the terminal measures the phase difference of received signals from multiple antennas and feeds back this information to the base station. The base station then adjusts the phase of transmitted signals based on this feedback to achieve coherent combining, thereby resolving the phase synchronization issue without requiring complex precision hardware.
Solution Approach 2:
Instead of using complex mechanical or hardware-based phase synchronization systems, the patent replaces them with software-based phase adjustment algorithms that process feedback information digitally. This substitution simplifies the system while achieving the desired coherent combining effect.
2Power
If phase compensation is applied to achieve coherent combining, then transmit power and coverage are enhanced, but system complexity increases due to additional processing requirements
Solution Approach 1:
The terminal performs the phase measurement and calculation functions that would otherwise require complex base station hardware. By utilizing the terminal's own processing capabilities to measure phase difference and provide feedback, the system achieves coherent combining with minimal additional complexity at the base station.
Solution Approach 2:
The feedback information acts as an intermediary that carries phase difference data from the terminal to the base station. This intermediary mechanism enables phase synchronization without requiring direct complex interaction or synchronization hardware between the multiple antennas and the terminal.
Data Source
AI summary
A signal transmission method and apparatus of a base station is provided for increasing transmit power by compensating a phase value of the signal transmitted through multiple antennas based on signal reception status information fed back from a terminal in a wireless communication system. The signal transmission method includes transmitting a signal to at least one terminal through the multiple antennas; receiving signal reception status information transmitted by the at least one terminal; calculating a compensation phase based on the signal reception status information; applying the compensation phase to next signal to be transmitted through the multiple antennas; and transmitting the next signal to the at least one terminal through the multiple antennas.