Projected block-wise SIC detection for communication systems with non-negativity constraints

Abstract

Recently, a number of projected successive interference cancellation (PSIC) and projected parallel interference cancellation (PPIC) structures, which make use of the non-negativity constraint in incoherent OCDMA systems to enhance their performance, have been proposed and studied in (Seleem et al. in IEEE Commun Lett 16:1721–1724, 2012). Although these structures showed improved performance, they still inherit the same shortcomings of the conventional SIC/PIC structures such as large detection delay for the SIC detector and slow convergence speed for the PIC detector. In this work, we propose a new projected block-wise SIC (PBSIC) structure that not only exploits the non-negativity constraint but also overcomes the drawbacks associated with the conventional SIC/PIC structures. In particular, it largely reduces the detection delay of the PSIC detector of (Seleem et al. in IEEE Commun Lett 16:1721–1724, 2012), while it enjoys the same fast convergence speed. Two approaches for decreasing the computational complexity of the proposed detector are investigated. Simulation results are in total agreement with our theoretical findings.

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Notes

  1. 1.

    A flop stands for floating point operation. Operations such as addition, multiplication, subtraction, division and compare are considered as one flop.

Abbreviations

K :

is the number of users.

k :

is the user index and it goes from1 to K.

W :

is the number of data symbols in each processing window.

w :

is the symbol index of the symbols in one sliding window interval and it goes from 1 to W.

k’ :

is the effective user index and it goes from 1 to WK.

N :

is the processing gain.

n :

is the chip index and it goes from 1 to N.

M :

is the number of data symbols.

m :

is the symbol index and it goes from 1 to M.

G :

is the number of blocks in a data packet.

B :

is the number of blocks in a data packet.

b :

is the block index and it goes from 1 to B.

PW:

length of each processing window (in chips).

V :

the overlap (in chips) between blocks in a data packet.

τ k :

is the relative delay of the kth user.

T t :

is a circular shift operator and it circularly shifts the rows of a matrix downward t rows.

\({\overline{\mathbf{s}}}_{k}\) :

is the {N -by-1} spreading code of the kth user.

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Acknowledgements

The authors acknowledge the support of King Saud University.

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Correspondence to Abdelouahab Bentrcia.

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Bentrcia, A. Projected block-wise SIC detection for communication systems with non-negativity constraints. Photon Netw Commun (2021). https://doi.org/10.1007/s11107-021-00942-y

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Keywords

  • OCDMA
  • SIC
  • Non-negativity
  • Interference cancellation
  • Multiuser detection