Trellis-Search Based Soft-Input Soft-Output MIMO Detector: Algorithm and VLSI Architecture

In this paper, we propose a trellis-search based soft-input soft-output detection algorithm and its very large scale integration (VLSI) architecture for iterative multiple-input multiple-output (MIMO) receivers. We construct a trellis diagram to represent the search space of a transmitted MIMO signa...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2012-05, Vol.60 (5), p.2617-2627
Main Authors: Yang Sun, Cavallaro, J. R.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Approximation
Approximation algorithms
Architecture
ASIC
Coding, codes
Detection algorithms
Detection, estimation, filtering, equalization, prediction
Detectors
Exact sciences and technology
Information, signal and communications theory
Integrated circuits
MIMO
MIMO algorithm
Modulation, demodulation
Searching
Signal and communications theory
Signal, noise
soft-input soft-output MIMO detection
Studies
Telecommunications and information theory
Transmitting antennas
trellis-search algorithm
Vectors
Very large scale integration
VLSI
Workload
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Summary:In this paper, we propose a trellis-search based soft-input soft-output detection algorithm and its very large scale integration (VLSI) architecture for iterative multiple-input multiple-output (MIMO) receivers. We construct a trellis diagram to represent the search space of a transmitted MIMO signal. With the trellis model, we evenly distribute the workload of candidates searching among multiple trellis nodes for parallel processing. The search complexity is significantly reduced because the number of candidates is greatly limited at each trellis node. By leveraging the trellis structure, we develop an approximate Log-MAP algorithm by using a small list of largest exponential terms to compute the LLR (log-likelihood ratio) values. The trellis-search based detector has a fixed-complexity and is very suitable for parallel VLSI implementation. As a case study, we have designed and synthesized a trellis-search based soft-input soft-output MIMO detector for a 4 × 4 16-QAM system using a 1.08 V TSMC 65 nm technology. The detector can achieve a maximum throughput of 1.7 Gb/s with a core area of 1.58 mm 2 .
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2012.2187646