Broadband active microstrip antenna for lower UHF applications

✍ Scribed by S. S. Pattnaik; Swapna Devi; P. A. Satheesan; A. L. Das; B. K. Sinha

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 318 KB
• Volume: 14
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(199701)14:1<28::aid-mop9>3.0.co;2-o

✦ Synopsis

of coherent detection without incurring the same level of receiver complexity.

5. CONCLUSION

An optically preamplified digital PPM receiver with an electrical domain filtering regime consisting of a matched filter in cascade with a PDD network has been rigorously analyzed for the first time. Under the assumption of Gaussian received pulse shapes, sensitivity curves and an examination of the pulse-shaping network behaviour have been presented. The penalty incurred by removing the pulse-shaping network has also been considered, and has been shown to be about 1.9 dB for high PPM coding levels, but is lower at the optimum coding level. The strong potential of the receiver configuration has been demonstrated by results surpassing not only a comparable optically preamplified OOK NRZ receiver, but also surpassing the fundamental sensitivity limit of such a receiver and approaching the sensitivity of coherent detection systems, though it should be remembered that such impressive performance is obtained at the cost of bandwidth.