Low-Complexity, Blind Phase Recovery for Coherent Receivers Using QAM Modulation

2011 ◽  
Author(s):  
Xiang Zhou ◽  
Yifan Sun
Keyword(s):  
Low Complexity ◽  
Phase Recovery ◽  
Qam Modulation ◽  
Coherent Receivers

Improved eighth-order statistics blind phase recovery algorithm for coherent receivers with 16-QAM modulation format

2014 ◽  
Vol 53 (9) ◽  
pp. 096109
Author(s):  
Yun Cheng ◽  
Jiangnan Xiao ◽  
Jing He ◽  
Jin Tang ◽  
Minlei Xiao ◽  
...  
Keyword(s):  
Order Statistics ◽  
Eighth Order ◽  
Phase Recovery ◽  
Recovery Algorithm ◽  
Modulation Format ◽  
Qam Modulation ◽  
Coherent Receivers

scholarly journals Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats

2019 ◽  
Vol 27 (11) ◽  
pp. 15617 ◽  
Author(s):  
Júlio César Medeiros Diniz ◽  
Qirui Fan ◽  
Stenio Magalhães Ranzini ◽  
Faisal Nadeem Khan ◽  
Francesco Da Ros ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Carrier Phase ◽  
Principal Component ◽  
Low Complexity ◽  
Component Analysis ◽  
Modulation Formats ◽  
Phase Recovery ◽  
Qam Modulation

scholarly journals A high throughput architecture for a low complexity soft-output demapping algorithm

2015 ◽  
Vol 13 ◽  
pp. 73-80 ◽  
Author(s):  
I. Ali ◽  
U. Wasenmüller ◽  
N. Wehn
Keyword(s):  
Wireless Communication ◽  
High Throughput ◽  
Turbo Code ◽  
Low Complexity ◽  
Implementation Cost ◽  
Qam Modulation ◽  
Iterative Systems ◽  
Very High ◽  
Complexity Algorithm ◽  
Hardware Performance

Abstract. Iterative channel decoders such as Turbo-Code and LDPC decoders show exceptional performance and therefore they are a part of many wireless communication receivers nowadays. These decoders require a soft input, i.e., the logarithmic likelihood ratio (LLR) of the received bits with a typical quantization of 4 to 6 bits. For computing the LLR values from a received complex symbol, a soft demapper is employed in the receiver. The implementation cost of traditional soft-output demapping methods is relatively large in high order modulation systems, and therefore low complexity demapping algorithms are indispensable in low power receivers. In the presence of multiple wireless communication standards where each standard defines multiple modulation schemes, there is a need to have an efficient demapper architecture covering all the flexibility requirements of these standards. Another challenge associated with hardware implementation of the demapper is to achieve a very high throughput in double iterative systems, for instance, MIMO and Code-Aided Synchronization. In this paper, we present a comprehensive communication and hardware performance evaluation of low complexity soft-output demapping algorithms to select the best algorithm for implementation. The main goal of this work is to design a high throughput, flexible, and area efficient architecture. We describe architectures to execute the investigated algorithms. We implement these architectures on a FPGA device to evaluate their hardware performance. The work has resulted in a hardware architecture based on the figured out best low complexity algorithm delivering a high throughput of 166 Msymbols/second for Gray mapped 16-QAM modulation on Virtex-5. This efficient architecture occupies only 127 slice registers, 248 slice LUTs and 2 DSP48Es.

High Performance and Low Complexity Carrier Phase Recovery Schemes for 64-QAM Coherent Optical Systems

2017 ◽  
Author(s):  
Jaime Rodrigo Navarro ◽  
Aditya Kakkar ◽  
Richard Schatz ◽  
Xiaodan Pang ◽  
Oskars Ozolins ◽  
...  
Keyword(s):  
Carrier Phase ◽  
High Performance ◽  
Low Complexity ◽  
Optical Systems ◽  
Phase Recovery ◽  
Recovery Schemes

Low complexity non decision directed blind carrier phase recovery algorithm for 16-QAM optical coherent receiver

2012 ◽  
Author(s):  
Md. Ibrahim Khalil ◽  
Md Mosaddek Hossain Adib ◽  
Arshad M Chowdhury ◽  
Md. Saifuddin Faruk ◽  
Abdullah Al Amin ◽  
...  
Keyword(s):  
Carrier Phase ◽  
Low Complexity ◽  
Phase Recovery ◽  
Recovery Algorithm ◽  
Coherent Receiver
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