| Presentation | 2001/10/12 An Embedded Transmission Method Using Asymmetric Error Correcting Codes with Optical Orthogonal Codes for Optical CDMA Katsuhiro KAMAKURA, Iwao SASASE, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We propose an embedded transmission method using asymmetric error correcting codes with optical orthogonal codes for optical code division multiple access(CDMA). In the method, multiple bits are embedded in a signature sequence used for identification, and the embedded bits are transmitted in the weighted positions of the signature sequence. Therefore, the transmission rate is increased, however, at the same time, the embedded bits are vulnerable to MAI because the correlation detection can not be used. To compensate this vulnerability, the increased transmission rate of the embedded method allows us to use an asymmetric error correcting(AEC) code, without reducing the information rate and expanding the system bandwidth. Consequently, the effect of MAI is reduced in the decoding procedure of the AEC code. We classify the codewords of the AEC code according to the number of 1's in each codeword, and then derive the bit error rate(BER). Numerical results show that for achieving a particular BER, the embedded modulation scheme requires less optical energy per bit than the traditional modulation scheme with the correlation and chip-level receivers, although the performance of the proposed scheme has the error floor, which is primarily due to multiaccess interference(MAI) beyond the error correction capability. Furthermore, we apply Reed-Solomon(RS) coding to the embedded modulation scheme. Consequently, RS coding reduces the floor value to be negligibly small. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | optical CDMA / embedded transmission method / AEC codes / MAI |
| Paper # | CS2001-96 |
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| Committee | CS |
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| Conference Date | 2001/10/12(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Communication Systems (CS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | An Embedded Transmission Method Using Asymmetric Error Correcting Codes with Optical Orthogonal Codes for Optical CDMA |
| Sub Title (in English) | |
| Keyword(1) | optical CDMA |
| Keyword(2) | embedded transmission method |
| Keyword(3) | AEC codes |
| Keyword(4) | MAI |
| 1st Author's Name | Katsuhiro KAMAKURA |
| 1st Author's Affiliation | Department of Information and Computer Science, Keio University() |
| 2nd Author's Name | Iwao SASASE |
| 2nd Author's Affiliation | Department of Information and Computer Science, Keio University |
| Date | 2001/10/12 |
| Paper # | CS2001-96 |
| Volume (vol) | vol.101 |
| Number (no) | 357 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |