Abstract
Abstract In order to improve the performance of the Spectral Amplitude Coding-Optical Code Division Multiple Access (SAC-OCDMA) system, a zero cross-correlation (ZCC) code named double weight multi-diagonal (DW-MD) is proposed with constant weight (CW) or variable weight (VW). Mathematical results illustrate that it is feasible to reduce the number of filters without sacrificing system performance by using the CW DW-MD code instead of the multi-diagonal (MD) code. And for the VW DW-MD code, the supportable number of users for lower code weight W L (3) at bit error rate (BER) of 10−3 (voice) is 43, medium code weight W M (4) at BER of 10−9 (data) is 29, and higher code weight W H (5) at BER of 10−12 (video) is 32. Finally, the analysis about the position of chips “1” is given, and the simulation setups show that the CW DW-MD code outperforms the MD code when Gaussian optical filter is used.
Highlights
Optical Code Division Multiple Access (OCDMA) is an attractive technology in the optical network due to the properties of asynchronous access to the entire channel and great capacity in bursty traffic [1]
The performance of the SAC-OCDMA system depends to a large extent on the choice of coding scheme, and many Spectral-Amplitude-Coding (SAC) codes have been reported, such as modified quadratic congruence (MQC) codes [3], double weight (DW) code family [7, 8], KhazaniSyed (KS) code [9], Random Diagonal (RD) code [10], MultiService (MS) code [11], Enhanced multi-diagonal (EMD) code [12], Zhang finite-difference (ZFD) code [13] and a code based on construction of parity check matrix of Low density parity check (LDPC) codes [14]
A new zero cross-correlation (ZCC) code named double weight multi-diagonal (DW-MD) code has been developed to reduce the number of filters used in the SAC-OCDMA system with the feature of two adjacent chips “1”
Summary
Optical Code Division Multiple Access (OCDMA) is an attractive technology in the optical network due to the properties of asynchronous access to the entire channel and great capacity in bursty traffic [1]. The performance of the SAC-OCDMA system depends to a large extent on the choice of coding scheme, and many Spectral-Amplitude-Coding (SAC) codes have been reported, such as modified quadratic congruence (MQC) codes [3], double weight (DW) code family [7, 8], KhazaniSyed (KS) code [9], Random Diagonal (RD) code [10], MultiService (MS) code [11], Enhanced multi-diagonal (EMD) code [12], Zhang finite-difference (ZFD) code [13] and a code based on construction of parity check matrix of Low density parity check (LDPC) codes [14]. 2) can be used to replace the two filters with a bandwidth of Δ f(central wavelength of f1 and f2, respectively)
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