On the average complexity of sphere decoding in lattice space-time coded multiple-input multiple-output channel

2012 ◽  
Vol 26 (3) ◽  
pp. 355-366 ◽  
Author(s):  
Walid Abediseid
Keyword(s):  
Multiple Input Multiple Output ◽  
Space Time ◽  
Sphere Decoding ◽  
Output Channel ◽  
Average Complexity ◽  
Lattice Space ◽  
Multiple Input ◽  
Input Multiple Output

scholarly journals Adaptive Threshold-Aided K-Best Sphere Decoding for Large MIMO Systems

2019 ◽  
Vol 9 (21) ◽  
pp. 4624
Author(s):  
Uzokboy Ummatov ◽  
Kyungchun Lee
Keyword(s):  
Mimo Systems ◽  
Signal To Noise Ratio ◽  
Multiple Input Multiple Output ◽  
Threshold Value ◽  
Adaptive Threshold ◽  
Sphere Decoding ◽  
High Signal ◽  
Signal To Noise ◽  
Multiple Input ◽  
Input Multiple Output

This paper proposes an adaptive threshold-aided K-best sphere decoding (AKSD) algorithm for large multiple-input multiple-output systems. In the proposed scheme, to reduce the average number of visited nodes compared to the conventional K-best sphere decoding (KSD), the threshold for retaining the nodes is adaptively determined at each layer of the tree. Specifically, we calculate the adaptive threshold based on the signal-to-noise ratio and index of the layer. The ratio between the first and second smallest accumulated path metrics at each layer is also exploited to determine the threshold value. In each layer, in addition to the K paths associated with the smallest path metrics, we also retain the paths whose path metrics are within the threshold from the Kth smallest path metric. The simulation results show that the proposed AKSD provides nearly the same bit error rate performance as the conventional KSD scheme while achieving a significant reduction in the average number of visited nodes, especially at high signal-to-noise ratios.

Threaded Space Time Code Design for CPM with Joint Decoding

2014 ◽  
Vol 631-632 ◽  
pp. 847-850
Author(s):  
Guo Wei Lei ◽  
Yuan An Liu ◽  
Xue Fang Xiao
Keyword(s):  
Phase Modulation ◽  
Multiple Input Multiple Output ◽  
Continuous Phase ◽  
Space Time ◽  
Continuous Phase Modulation ◽  
Code Design ◽  
Time Code ◽  
Soft Decoding ◽  
Multiple Input ◽  
Input Multiple Output

In the letter, a system of continuous phase modulation (CPM) with threaded space time codes (TSTC) is proposed for multiple-input multiple-output systems. In the system, source bits are coded via outer coder of Reed Solomon (RS). The codeword of which is suitable for TSTC design. Then inner coder mainly converts binary symbols into M-ary symbols for purpose of CPM. At receiver, Joint soft decoding approach is considered. Finally simulation results are provided for VBLAST, DBLAST, and TSTC as comparison.

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