NDLI: Demodulation of amplitude modulated signals in the presence of multipath

Content Provider	IEEE Xplore Digital Library
Author	Zhengyuan Xu Ping Liu
Copyright Year	2000
Description	Author affiliation: Dept. of Electr. Eng., California Univ., Riverside, CA, USA (Zhengyuan Xu)
Abstract	Signals modulated by M-ary pulse amplitude modulation (PAM) or M-ary quadrature amplitude modulation (QAM) have a certain structured constellation. When the communication channel introduces intersymbol interference (ISI) at the receiver end, demodulation of such signals can be performed by constant modulus algorithm (CMA) based equalizers to cancel the interference. However, characteristics of modulated signals are only partially considered in the CMA cost function. In this paper, more constraints are imposed on the equalized signal to fully capture the property of the modulated signal both in its phase and amplitude. Observing that PAM signals are uniformly spaced on the x-axis and QAM signals in two-dimensional signal space, the property of transmitted signals from each category can be included in an equivalent deterministic mathematical description, similar to the constant modulus. This description is absorbed in our modified cost function, resulting in a simultaneous minimization of dispersion relevant to signal phase and amplitude. The performance of the equalizers based on these new algorithms are compared with the CMA equalizer.
Starting Page	33
Ending Page	37
File Size	453140
Page Count	5
File Format	PDF
ISBN	0780359887
DOI	10.1109/SSAP.2000.870076
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-08-16
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Demodulation Amplitude modulation Quadrature amplitude modulation Intersymbol interference Equalizers Pulse modulation Cost function Constellation diagram Communication channels Interference cancellation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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