Abstract
In this paper, we describe a simplified soft-output demapper designed to support coded multiple-input multiple-output orthogonal frequency-division multiplexing-based system utilizing only 3-bit soft information. The IEEE 802.11n standard requires relatively high punctured convolutional code rate of R=5/6 for spectrally efficient high-throughput data rate settings. In order to extract soft-bit information effectively without degrading the packet error rate performance, we introduce bit-rounding and effective-bit threshold adjustment techniques to achieve such.
Highlights
In many areas of modern digital communication systems, modulation and coding scheme (MCS) in conjunction with bit-interleaved coded modulation technique has been adopted
In order to decode multiple layers of transmit signals propagated in the wireless fading channel, the multiple-input multiple-output (MIMO) detector takes the crucial role of extracting soft-bit signals for optimal decoding performance
The maximum likelihood (ML) detector having log-likelihood ratio (LLR) output is known as the optimum detector
Summary
In many areas of modern digital communication systems, modulation and coding scheme (MCS) in conjunction with bit-interleaved coded modulation technique has been adopted. The output signal of MIMO detector is processed in soft demapper. MIMO signal detection We apply simple linear ZF nulling scheme to detect symbols for lower implementation complexity.
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