MIMO Transmitter Signal Processing for Inter-Block Delay Elimination
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Solution Overview
Problem
In single carrier block multi-user MIMO transmission, the addition of a Cyclic Prefix (CP) leads to a 1-block long delay due to processing, which needs to be avoided.
Innovation Solution
A radio communication system that calculates and subtracts a delay wave component from data signals, adjusts power and phase using communication path response information, and adds an additional signal instead of a CP to avoid delays, allowing for efficient data transmission without inter-block interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Cyclic Prefix (CP) is added to the head of each block to avoid inter-block interference, then inter-block interference is prevented, but a 1-block long processing delay occurs
Solution Approach 1:
The patent extracts and removes the delay wave component of the additional signal from the transmitted signal. By calculating the delay wave component based on communication path response information and subtracting it from the signal before transmission, the system eliminates the need for CP while preventing inter-block interference, thus resolving the contradiction between reliability and time loss.
Solution Approach 2:
The patent performs preliminary calculation and subtraction of the delay wave component before signal transmission. By acquiring communication path response information in advance and pre-calculating the delay wave component to be subtracted, the system prepares the signal in advance to eliminate inter-block interference without requiring CP, thereby avoiding processing delays.
2Loss of time
If an additional signal is added instead of CP, then processing delays are eliminated, but complex calculations for delay wave component subtraction are required
Solution Approach 1:
The patent performs the complex calculation of delay wave component subtraction in advance, before signal transmission. By acquiring communication path response information beforehand and pre-calculating the necessary subtraction components, the system shifts computational complexity to the preparation phase, enabling real-time transmission without delays while managing calculation complexity through advance processing.
Solution Approach 2:
The patent introduces communication path response information as an intermediary element that facilitates the subtraction process. This intermediary information enables the calculation and subtraction of delay wave components, making the complex operation manageable and systematic while achieving the goal of eliminating processing delays.
3Reliability
If beam forming is performed using communication path response information, then transmission directivity and communication quality are improved, but additional processing steps are required
Solution Approach 1:
The patent makes the communication path response information serve multiple functions simultaneously. The same information is used both for beam forming to improve transmission directivity and for calculating the delay wave component to be subtracted. This multi-functionality approach improves communication quality while minimizing additional processing steps by reusing the same data for multiple purposes.
Data Source
AI summary
A radio communication system includes a transmitting station, and at least one receiving apparatus. The transmitting station includes a plurality of modulation units configured to modulate a plurality of input data to generate first data signals in units of blocks having a predetermined data length, a subtraction unit configured to calculate, by using information acquired in advance and indicating a communication path response between the transmitting station and the receiving apparatus, information indicating directivity upon transmission of the first data signals of each of the plurality of modulation units, and predetermined information included in an additional signal to be added to a data signal, a delay wave component of the additional signal and subtract the delay wave component calculated, from each of the first data signals of the plurality of modulation units, to generate a plurality of second data signals, a beam forming unit configured to adjust, by using the information indicating directivity, power and a phase upon transmission of each of the plurality of second data signals to generate a plurality of third data signals, a plurality of adding units configured to add the additional signal to each of the plurality of third data signals to generate a plurality of fourth data signals, and a plurality of communication units configured to transmit the plurality of fourth data signals to the receiving apparatus.