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Hardware design issues for a mobile unit for next generation CDMA systems
(1998-07-20)
This paper addresses hardware design issues of a mobile receiver for future generation direct sequence CDMA wireless communication systems. In the design of a mobile unit, fixed-point hardware is an attractive alternative ...
Demonstration of all-optical CDMA with bipolar codes
(1997)
Using a fiber-based testbed, we experimentally verify that the advantageous correlation properties of bipolar spread-spectrum codes can be preserved in an optical channel using direct detection and all-optical encoder/decoders. ...
Stability and performance robustness of discrete-time systems with structured uncertainty
(1990)
The robustness of discrete-time systems in the presence of norm-bounded linear time-varying and/or nonlinear perturbations is addressed. A general framework for dealing with stability as well as performance robustness of ...
Iterative Multiuser Detection and Decoding
(1998-11-20)
An iterative detection and decoding algorithm is explored for a convolutionally coded DS-CDMA system. The optimum decoding strategy is to consider the trellises of all the users simultaneously, but this has exponential ...
3-D segmentation and volume estimation of radiologic images by a novel, feature driven, region growing technique
(1992)
Magnetic Resonance (MR) imaging is a 3-D, multi-slice, radiological technique that acquires multiple intensities corresponding to each voxel. The transverse relaxation time, T$\sb1$, and the axial relaxation time, T$\sb2$, ...
Stabilization and throughput of spread spectrum multiple access systems with multiple reception capability
(1992)
The task of stabilizing communication networks sharing a spread spectrum channel is addressed. A slotted system is considered and the stabilization is achieved by controlling the number of packets that are transmitted in ...
Experimental demonstration of bipolar codes for direct detection multi-user optical communication
(1996-10-20)
We report the first experimental demonstration of a broadband spectral encoding and decoding technique using bipolar codes for optical code-division multiple access. The codeword correlations are verified and rejection of ...
Gradient estimation for stochastic optimization of optical code-division multiple-access systems. II. Adaptive detection
(IEEE, 1997-05-20)
For pt.I see ibid., vol.15, no.4, p.731-41 (1997). We develop infinitesimal perturbation analysis (IPA)-based stochastic gradient algorithms for deriving optimum detectors with the average probability of bit error being ...
Multiuser receivers for code-division multiple-access systems with trellis-based modulation
(1996-10-20)
A code-division multiple-access (CDMA) communication system is studied where a trellis-based scheme is used for data encoding and modulation. The signature sequences (spreading codes), which are assigned to the direct-sequence ...