Space-Time Block Code Encoding for MIMO Systems
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Solution Overview
Problem
Current space time block coding schemes in MIMO mobile communication systems face challenges in achieving full diversity and full rate while minimizing complexity and computation, particularly when using multiple transmit antennas, leading to increased latency and data rate loss.
Innovation Solution
The proposed solution involves a pre-encoder that pre-encodes input signals using a new pre-encoding matrix, which minimizes complexity and computation by employing a space-time mapping scheme with Alamouti encoders and a channel response matrix generator in both the transmitter and receiver, allowing for efficient decoding and encoding with full diversity and full rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional space time block coding schemes are used with multiple transmit antennas, then diversity gain is achieved, but computational complexity and latency increase
Solution Approach 1:
The transmitter is divided into separate functional modules: pre-encoder for initial encoding, space-time mapper for mapping coded symbols to transmit antennas, and individual encoders for each antenna. This segmentation allows each module to perform specialized functions with optimized complexity, achieving full diversity without requiring the receiver to handle all computations centrally.
Solution Approach 2:
The pre-encoder performs preliminary encoding of the input signal before space-time mapping. By pre-encoding the signal and pre-calculating the coded symbols, the system reduces the computational burden on subsequent processing stages and enables simpler receiver operations while maintaining full diversity performance.
2Reliability
If conventional space time block coding schemes are used with multiple transmit antennas, then diversity gain is achieved, but data transmission rate decreases
Solution Approach 1:
The space-time mapper continuously maps coded symbols to transmit antennas in a streamlined manner, and the parallel encoder structure enables simultaneous processing of multiple symbol streams. This continuous operation minimizes idle time and maintains high data transmission rates while achieving full diversity through the multi-antenna configuration.
3Reliability
If conventional space time block coding schemes are used with multiple transmit antennas, then full diversity is achieved, but latency increases
Solution Approach 1:
By segmenting the encoding process into pre-encoding and space-time mapping stages with dedicated encoder modules for each antenna, the system enables parallel processing of multiple symbol streams. This reduces the time required to prepare and transmit coded symbols, lowering latency while maintaining full diversity.
Solution Approach 2:
The pre-encoder performs encoding operations in advance before space-time mapping, and the channel response matrix generator pre-calculates channel information. These preliminary actions prepare the data structure and channel knowledge beforehand, reducing processing delays during actual transmission and achieving full diversity with minimal latency.
4Productivity
If conventional space time block coding schemes are used with multiple transmit antennas, then full rate is achieved, but computational complexity increases
Solution Approach 1:
The system segments the full-rate encoding process into modular components: pre-encoder, space-time mapper, and individual encoders for each transmit antenna. Each module handles a specific portion of the computation, allowing full rate operation without requiring any single component to perform excessively complex calculations.
Solution Approach 2:
The pre-encoder and channel response matrix generator perform preliminary processing to prepare coded symbols and channel information in advance. This preliminary action structures the data optimally for subsequent transmission, enabling full rate operation with reduced computational complexity during the actual encoding and transmission phases.
Data Source
AI summary
Disclosed is an apparatus and method for encoding/decoding a space time block code in a mobile communication system using a multiple input multiple output scheme. In a transmitter employing a plurality of transmit antennas in the mobile communication system, if a signal to be transmitted is input, the transmit signal is pre-encoded according to a preset coding scheme, the pre-encoded signal is space-time mapped according to a number of the transmit antennas to employ a preset space time block coding scheme, and the space-time mapped signal is transmitted through the transmit antennas by applying the preset space time block coding scheme to the space-time mapped signal.