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Performance comparison of pilot tone aided and pilot symbol aided QAM over a mobile radio channel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publication11th Symposium on Personal Indoor and Mobile Radio Communications, London
Publisher or commissioning bodyInstitute of Electrical and Electronics Engineers (IEEE)
Pages1145 - 1149
ISBN (Print)0780364655
StatePublished - Sep 2000


Conference11th International Symposium on Personal, Indoor and Mobile Radio Communications (2000)
Abbreviated titlePIMRC
CountryUnited Kingdom
Period1/09/00 → …


This paper compares the performance of pilot tone aided (PTA) and pilot symbol aided (PSA) BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM over a narrowband radio channel. This set of modems is capable of achieving 14, 28, 48, 56, 70 and 84 kbit/s respectively in a 20 kHz channel bandwidth. Computer simulations in a Rayleigh fading channel show that PTA modems have almost the same performance as PSA modems. However PTA signals have a higher peak to mean power ratio (η) and this translates into greater amplifier linearity requirements in the transmitter. In the PSA modems, η is independent of the pilot symbols, however in the PTA modems it depends upon the pilot tone to data power ratio (R). An optimisation of R in an AWGN channel gives a value of 0.2 for QAM. A comparison of η between PSA and PTA transmitted signals show differences of 3.38, 5.1, 4.8, 4.25, 4.45 and 3.9 dB for 99.9% of the time (based on the above mentioned list of modulation schemes).

Additional information

Rose publication type: Conference contribution Sponsorship: The authors wish to acknowledge Linear Modulation Technology Ltd for providing the funding to develop the PTA simulations Terms of use: Copyright © 2000 IEEE. Reprinted from Proceedings of 11th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2000. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

  • Rayleigh channels, land mobile radio, quadrature phase shift keying


11th International Symposium on Personal, Indoor and Mobile Radio Communications (2000)

Abbreviated TitlePIMRC
Duration1 Sep 2000 → …
CountryUnited Kingdom

Event: Conference





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