Online First

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A cognitive radio based solution to coexistence of FH and OFDM signals implemented on USRP N210 platform

M. Janjić, M. Erić
Topic:
Radio Communications
Abstract
A new concept development and practical implementation of OFDM based secondary cognitive link are presented in this paper. Coexistence of secondary user employing Orthogonal Frequency Division Multiplexing (OFDM) and primary user employing Frequency Hopping (FH) is achieved. Secondary and primary links are realized using Universal Software Radio Peripheral (USRP) N210 platforms. Cognitive features of spectrum sensing and changing transmission parameters are implemented. Some experimental results are presented.
Keywords
Cognitive radio, FH, OFDM, secondary link, spectrum sensing, USRP platform.
Full Text
HyperLink A cognitive radio based solution to coexistence of FH and OFDM signals implemented on USRP N210 platform

Performance of 2D SOVA Along and Across Track in Shingled Magnetic Recording Media

M. B. Abdulrazaq, M. Z. Ahmed, and P. Davey
Topic:
Signal Processing
Abstract
Serial Concatenation of Two Dimensional Soft Output Viterbi Algorithm (2D-SOVA) and regular Viterbi Algorithm (VA) for 2D equalisation and detection of Shingled Magnetic Recording (SMR) media provides excellent performance as compared to use of 1 Dimensional (1D) maximum likelihood detector. In this paper, we implement and evaluate the performances of two versions of it. The first version performs 2D SOVA along the tracks to eliminate effect of inter-symbol interference (ISI) and then Viterbi detector across the tracks to remove inter-track interference (ITI). The second version carries out 2D-SOVA across the tracks and VA along the tracks. The results for high ITI and ISI shows better performance by using 2D-SOVA across the track with little difference in computational complexity in favour of 2D-SOVA across the tracks.
Keywords
2D detection, Maximum Likelihood Detection, Shingled Magnetic Recording, SMR, Soft Output Viterbi Algorithm, SOVA.
Full Text
HyperLink Performance of 2D SOVA Along and Across Track in Shingled Magnetic Recording Media