MIMO Transmission Apparatus Using Pilot Multiplexing
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Solution Overview
Problem
Current radio communication systems, particularly in third-generation communication methods like IMT-2000, face challenges in increasing transmission rates, capabilities, and reducing power consumption while maintaining signal quality, especially in uplink and downlink channels.
Innovation Solution
The implementation of a transmission apparatus that uses multiple antennas for simultaneous radio transmission, employing pilot multiplexing methods such as time division, frequency division, and code division multiplexing, along with space division multiplexing and space time transmission diversity techniques to improve signal quality and resource usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multiple input multiple output (MIMO) method is adopted to improve transmission quality, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission system into multiple independent antennas, each capable of transmitting separate signals. This segmentation allows the system to achieve MIMO functionality by dividing the transmission task across multiple physical entities, improving signal quality through spatial diversity while managing complexity through modular architecture
Solution Approach 2:
The patent introduces the spatial dimension by utilizing multiple antennas arranged in space. This dimensional expansion transforms a single-channel transmission system into a multi-channel spatial system, enabling signal quality improvement through spatial multiplexing and diversity without proportionally increasing processing complexity
2Measurement precision
If time-multiplexing of pilot channel and data channel is implemented, then channel estimation accuracy is improved, but transmission rate is reduced
Solution Approach 1:
The patent segments the transmission resources by allocating specific time slots exclusively for pilot channel transmission and other time slots for data channel transmission. This time-domain segmentation enables accurate channel estimation during dedicated pilot periods while maintaining high data transmission rates during data periods, resolving the contradiction between estimation accuracy and transmission efficiency
Solution Approach 2:
The patent implements periodic transmission of pilot channels at predetermined intervals within the data transmission stream. This periodic action ensures that channel estimates are regularly updated to maintain accuracy while minimizing the overall time consumed by pilot transmission, thereby preserving high transmission rates for the majority of the time
Data Source
AI summary
A transmission apparatus which attempts improvement of signal quality in an uplink and a downlink carries out radio transmission of different signals simultaneously from respective ones of a plurality of antennas. The apparatus has pilot multiplexing means for multiplexing a pilot channel to transmit from each antenna in one or more of a time division multiplexing method, a frequency division multiplexing method and a code division multiplexing method, data multiplexing means for time-multiplexing a pilot channel and a data channel, and means for transmitting a signal in a least one of a space division multiplexing (SDM) method and a space time transmission diversity (STTD) method.