MIMO Codebook Generation Using Hamming Distance and Phase Rotation
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Solution Overview
Problem
The existing STBC-SSC scheme in MIMO wireless communication systems limits the number of sequences that can be constructed, leading to increased sequence decoding errors and Tx symbol errors, making it difficult to utilize multiple sequences effectively due to reduced advantages and higher error probabilities.
Innovation Solution
A method is proposed to generate a codebook in a MIMO wireless communication system by allocating bit streams to antenna sequence codewords based on a sequence codebook, which is constructed using a minimum Hamming distance and phase rotation of the Tx symbol codeword matrix to reduce error probabilities and increase the number of usable sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional STBC-SSC scheme is used to generate sequences, then the implementation is simple, but the number of constructable sequences is reduced and error probability increases
Solution Approach 1:
The patent applies parameter changes by modifying the codebook generation process to use phase rotation of Tx symbol codeword matrices and constructing sequences based on minimum Hamming distance criteria. This changes the parameters of sequence construction from conventional methods to optimized methods that increase the number of usable sequences while maintaining implementation feasibility.
Solution Approach 2:
The patent implements preliminary action by pre-generating and storing optimized antenna sequence codebooks that satisfy minimum Hamming distance requirements. These pre-computed codebooks are prepared in advance and stored for later use, eliminating the need for complex real-time sequence generation during transmission while ensuring high decoding accuracy.
2Productivity
If more sequences are constructed to increase data loading capacity, then the data transmission capacity increases, but the sequence decoding error probability increases
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of sequence construction to base sequences on minimum Hamming distance rather than conventional methods. This allows the system to construct more sequences (increasing productivity) while the Hamming distance criterion ensures that sequences remain sufficiently distinct (maintaining reliability).
Solution Approach 2:
The patent applies dynamics by adaptively selecting sequences from the codebook based on channel conditions and UE capabilities. The system can dynamically adjust which sequences to use from the pre-generated codebook, optimizing the balance between the number of sequences used and their decoding reliability based on current system state.
3Ease of operation
If the number of antenna index sequences is reduced to simplify UE operation, then the UE processing complexity is reduced, but the advantages of STBC-SSC scheme are deteriorated
Solution Approach 1:
The patent applies preliminary action by pre-generating optimized antenna sequence codebooks that satisfy minimum Hamming distance requirements. These pre-computed codebooks are prepared in advance and stored for later use, eliminating the need for complex real-time sequence generation during transmission while ensuring high decoding accuracy.
Solution Approach 2:
The patent applies parameter changes by modifying the codebook generation process to use phase rotation of Tx symbol codeword matrices and constructing sequences based on minimum Hamming distance criteria. This changes the parameters of sequence construction from conventional methods to optimized methods that increase the number of usable sequences while maintaining implementation feasibility.
Data Source
AI summary
A method for transmitting a signal to a receiver by a transmitter in a multiple input multiple output (MIMO) wireless communication system is disclosed. A method for transmitting a signal to a receiver by a transmitter in a multiple input multiple output (MIMO) wireless communication system includes: generating at least one bit stream by channel-coding data; allocating a first bit stream having a specific size from among the bit streams to an antenna sequence codeword according to an antenna sequence codebook; and transmitting the remaining second bit stream from among the bit streams to the receiver according to the order of antenna pairs indicated by the allocated antenna sequence codeword, wherein the antenna sequence codebook indicates a mapping relationship between the first bit stream and the antenna sequence codeword, and the antenna sequence codeword is defined by two timeslots and two antenna indexes.