Referenced Items are not available for this document.
π/4-DQPSK (differential quadrature phase shift keying) and F-QPSK modem/radio IC architectures are presented for unlicensed consumer electronics applications in the industrial, scientific, and medical (ISM) bands under FCC Part 15. An all-digital π/4-DQPSK modulator design, which is the new US digital cellular standard, provides significant size and current drain reduction over conventional DSP-based techniques. The low-cost F-QPSK modem/radio architecture offers higher power efficiency as well as higher spectral efficiency. Detailed circuits and design aspects are presented. The performance of each scheme employed in an intelligent frequency-hopping system is evaluated for a Rayleigh-fading/AWGN environment. Experimental results and computer simulations demonstrate that the proposed modem/radio architectures have both power and spectral advantages for the ISM band wireless applications. With the intelligent frequency-hopping scheme, the BER (bit error rate) performance can be improved by 5-10 dB as compared to conventional QPSK systems
Published in:
Consumer Electronics, IEEE Transactions on
(Volume:39
,
Issue:
2
)
Date of Publication: May 1993
- Page(s):
- 100 - 106
- ISSN :
- 0098-3063
- INSPEC Accession Number:
- 4472564
- Digital Object Identifier :
- 10.1109/30.214814
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- May 1993
- Sponsored by :
- IEEE Consumer Electronics Society
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