Dynamic Preamble Allocation for Space Diversity Detection
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Solution Overview
Problem
Conventional space-time coding (STC) methods fail to correctly specify the number of dimensions in space diversity and decode data signals when channel quality between the radio transmitting apparatus and the radio receiving apparatus is poor, leading to interference and incorrect decoding.
Innovation Solution
A radio transmitting apparatus and receiving apparatus that dynamically allocate mutually different preamble sequences to each antenna within a transmission block interval, ensuring correct detection and decoding by specifying the number of dimensions in space diversity based on channel quality, even when channel conditions vary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed preamble sequence is allocated to the main antenna in conventional STBC, then the system structure is simple, but the receiving apparatus fails to correctly detect the preamble sequence when channel quality between the main antenna and receiving antenna is poor, leading to incorrect specification of space diversity dimensions
Solution Approach 1:
The patent applies dynamics by changing the preamble sequence allocation from a fixed pattern to a dynamic one. Specifically, the transmitting apparatus dynamically selects which antenna transmits the main antenna preamble sequence based on channel quality feedback from the receiving apparatus. This allows the system to adapt to varying channel conditions, ensuring reliable preamble detection even when the main antenna experiences poor channel quality, thereby resolving the contradiction between detection reliability and system complexity.
Solution Approach 2:
The patent changes the parameter of antenna selection for main antenna preamble sequence transmission. Instead of always using a predetermined main antenna, the system varies the transmitting antenna based on channel quality parameters. The receiving apparatus measures channel quality for each antenna and feeds back this information, enabling the transmitting apparatus to select the optimal antenna for preamble sequence transmission, thus improving detection reliability without significantly increasing system complexity.
2Measurement precision
If the radio transmitting apparatus uses a predetermined main antenna for main antenna preamble sequence transmission, then the allocation is simple, but the receiving apparatus cannot securely specify the number of dimensions in space diversity when channel quality of the predetermined main antenna is poor
Solution Approach 1:
The patent implements feedback by having the receiving apparatus measure channel quality for each transmitting antenna and feed back this information to the transmitting apparatus. Based on this feedback, the transmitting apparatus dynamically determines which antenna should transmit the main antenna preamble sequence. This feedback mechanism ensures that the antenna with the best channel quality is selected, enabling accurate channel quality estimation and secure specification of space diversity dimensions while maintaining operational simplicity.
Solution Approach 2:
The patent applies preliminary action by having the receiving apparatus perform channel quality measurement for all transmitting antennas before the actual data transmission begins. This preliminary channel quality assessment allows the system to pre-determine the optimal antenna for main antenna preamble sequence transmission, ensuring accurate measurement and simplifying the subsequent operation of preamble sequence allocation and processing.
3Productivity
If the transmitting apparatus always uses the same antenna for main antenna preamble sequence, then the system is easy to implement, but interference from other antennas causes decoding errors when channel conditions vary
Solution Approach 1:
The patent applies dynamics by making the main antenna preamble sequence transmission antenna variable rather than fixed. The system dynamically selects the transmitting antenna based on real-time channel quality conditions, ensuring that the antenna with the best channel quality transmits the preamble sequence. This dynamic selection minimizes interference from other antennas and maintains high data transmission efficiency under varying channel conditions.
Solution Approach 2:
The patent changes the parameter of transmitting antenna selection based on channel quality conditions. Instead of using a fixed antenna, the system varies the transmitting antenna parameter according to measured channel quality. This parameter change allows the system to avoid interference from other antennas by selecting the optimal transmitting antenna, thereby improving productivity while reducing harmful interference effects.
Data Source
Figure 1
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Figure 3A~3B
AI summary
A radio transmitting apparatus wherein even if a preamble sequence transmitted via any one of the antennas of the radio transmitting apparatus is detected, the order of the space diversity can be determined with reliability and data signals can be normally decoded. In this apparatus, a deciding unit (101) decides preamble sequences the number of which is equal to the order of the space diversity and further decides transmission block intervals the number of which is equal to or greater than the order of the space diversity. An allocating unit (102) sequentially allocates the preamble sequences, the number of which is equal to the order of the space diversity, to the respective antennas, the number of which is equal to the order of the space diversity, within the respective transmission block intervals. The allocating unit (102) allocates different ones of the preamble sequences to the respective antennas at the respective same transmission timings that are within the respective transmission block intervals.