1. System performance is analyzed in uncoded system.

2. In this paper circular uncoded targets and coded targets are used as reference points, and an algorithm of automatic reference point detection is proposed.

3. A documented procedure should be followed if uncoded printed materials are returned to stock.

4. A few coded points and plenty of uncoded points are used together.

5. Simulation shows that LLR ordering algorithms achieve significant performance gain in uncoded systems and a faster convergence in coded systems.

6. Firstly, this paper dose some research on the principle of TCM , PTCM and the ACG for coded 64-QAM compared with uncoded 16-QAM in two ways.

7. Simulation results show that the proposed scheme can achieve significant coding gain over the uncoded system with good bandwidth efficiency and reduced decoding complexity.

8. Analysis results show that, under the same bit rate and same chip interval and same number of available wavelengths[http:///uncoded.html], the BER performance of BCH/FFHOCDMA is much better than uncoded FFHOCDMA systems.

9. Thus the soft Viterbi decoding algorithm can be performed. It is shown that more coding advantages can be gotten compared with the traditional uncoded DUSTM which is deco ...

10. Then, the performance of BCH coded FFH OCDMA system was analyzed, and was compared with uncoded FFH OCDMA system.

11. The scheme can keep frequency bandwidth and symbol rate as the uncoded MFSK system.