Broadcast Data Transmission Power and Precoding Optimization
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Solution Overview
Problem
Existing spatial multiplexing schemes in mobile broadcasting systems experience significant performance degradation due to erasure fading channels and antenna correlation, which are not accounted for in existing designs assuming independent channel values between transmit and receive antennas.
Innovation Solution
The method involves controlling transmission power and precoding data streams using a modulation scheme-specific precoding matrix, and optionally shifting the phase of data streams to optimize performance in fading channels and correlated antenna environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing spatial multiplexing schemes are applied in mobile broadcasting systems, then data transmission capacity is increased, but performance degradation occurs due to erasure fading channels and antenna correlation
Solution Approach 1:
The patent changes the parameter of transmission power by allocating different power levels to different data streams based on channel conditions. The base station determines optimal power allocation parameters to compensate for erasure fading effects, thereby maintaining reliable transmission performance while preserving high data transmission capacity through spatial multiplexing
Solution Approach 2:
The patent applies preliminary action by pre-compensating for channel effects before transmission. The base station performs channel estimation and determines appropriate power allocation and precoding matrices in advance, based on predicted channel conditions, to counteract the expected erasure fading and correlation effects before the actual data transmission occurs
2Productivity
If spatial multiplexing is used with multiple transmit and receive antennas, then spectrum efficiency is enhanced, but performance degradation occurs when channel correlation between antennas is present
Solution Approach 1:
The patent applies local quality by treating each data stream transmitted through different antenna combinations with customized power allocation and precoding parameters. Instead of uniform treatment, each spatial stream receives localized optimization based on its specific channel characteristics, thereby maintaining spectrum efficiency while compensating for local correlation effects between specific antenna pairs
Solution Approach 2:
The patent changes parameters by dynamically adjusting power allocation ratios and precoding matrix elements based on measured channel correlation between antennas. When correlation is detected, the system modifies transmission parameters to orthogonalize the effective channels, thereby preserving the high spectrum efficiency of spatial multiplexing while eliminating performance degradation from antenna correlation
Data Source
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AI summary
Provided is a system for transmitting broadcasting data. The broadcasting data transmission system may transmit broadcasting data using a plurality of transmit antennas and a plurality of receive antennas. A broadcasting data transmission apparatus included in the broadcasting data transmission system may differently determine a modulation scheme with respect to each of the transmit antennas, may differently determine a transmission power of each data stream based on the determined modulation scheme, and may differently determine a precoding vector.