MIMO Precoder With Pre-Phase Shifting for BER and Peak Energy
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Solution Overview
Problem
Current Multiple Input Multiple Output (MIMO) technologies face challenges in enhancing transmission efficiency and bit-error-rate (BER) performance, particularly in digital broadcasting services, due to limitations in frequency resource utilization and signal processing methods.
Innovation Solution
A transmitter and receiver system employing MIMO precoding with pre-phase shifting or pre-phase hopping, followed by superposition encoding and OFDM modulation, to generate and process transmission signals, which improves transmit diversity and BER performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MIMO transmission methods are used, then transmission efficiency is maintained at baseline levels, but transmit diversity and BER performance remain limited
Solution Approach 1:
The patent applies preliminary action by performing pre-phase shifting or pre-phase hopping on the input signals before superposition encoding. This pre-processing of the signals with phase modifications before combining them enables improved transmit diversity and BER performance while maintaining transmission efficiency, as the phase pre-adjustment prepares the signals for more effective spatial multiplexing.
Solution Approach 2:
The patent employs parameter changes by modifying the phase parameters of the input signals through pre-phase shifting or pre-phase hopping operations. By changing the phase parameters before superposition encoding, the system achieves enhanced transmit diversity and BER performance without sacrificing transmission efficiency, as the phase parameter modifications create more favorable signal conditions for MIMO detection.
2Reliability
If phase shifting or phase hopping is applied to input signals, then transmit diversity increases, but signal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing pre-phase shifting or pre-phase hopping on the input signals before superposition encoding. This pre-processing step establishes the phase relationships in advance, enabling improved transmit diversity while keeping the overall processing structure systematic and manageable, thus limiting the increase in processing complexity.
Solution Approach 2:
The patent employs parameter changes by modifying only the phase parameters of the input signals through simple phase shifting or hopping operations. These parameter modifications are computationally efficient compared to more complex signal transformations, thereby achieving enhanced transmit diversity with moderate increases in processing complexity rather than substantial complexity increases.
3Productivity
If superposition encoding is used to combine signals, then transmission capacity increases, but peak-symbol energy increases
Solution Approach 1:
The patent employs parameter changes by applying pre-phase shifting or pre-phase hopping to the input signals before superposition encoding. This phase parameter modification redistributes the signal energy more favorably, enabling the system to achieve high transmission capacity through superposition encoding while reducing peak-symbol energy, as the phase adjustments prevent constructive interference that would create high peak energies.
4Reliability
If MIMO precoding with pre-phase shifting is implemented, then BER performance improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by performing pre-phase shifting or pre-phase hopping on the input signals before superposition encoding and transmission. This pre-processing step improves BER performance by establishing favorable phase relationships, while the modular structure of the pre-processing block keeps the overall device complexity increase manageable and systematic.
Data Source
AI summary
A signal transmitter and receiver are provided. The transmitter includes: a Multiple Input Multiple Output (MIMO) precoder configured to, in response to a first input signal and a second input signal, generate a first transmission signal and a second transmission signal by performing MIMO precoding by pre-phase shifting or pre-phase shifting/hopping the second input signal, and superposition encoding the first input signal and the pre-phase shifted or pre-phase shifted/hopped second input signal; and an Orthogonal Frequency Division Multiplexing (OFDM) modulator configured to OFDM modulate the first transmission signal and the second transmission signal.