Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)

A. J. Mendez; V. J. Hernandez; R. M. Gagliardi; C. V. Bennett

doi:10.1117/12.725384

13 February 2007 Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)

A. J. Mendez, V. J. Hernandez, R. M. Gagliardi, C. V. Bennett

Author Affiliations +

Proceedings Volume 6457, Free-Space Laser Communication Technologies XIX and Atmospheric Propagation of Electromagnetic Waves; 64570H (2007) https://doi.org/10.1117/12.725384
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

M-ary pulse position modulation (M-ary PPM) is an alternative to on-off-keying (OOK) that transmits multiple bits as a single symbol occupying a frame of M slots. PPM does not require thresholding as in OOK signaling, instead performing a comparison test among all slots in a frame to make the slot decision. Combining PPM with optical code division multiple access (PPM/O-CDMA) adds the benefit of supporting multiple concurrent, asynchronous bursty PPM users. While the advantages of PPM/O-CDMA are well known, implementing a receiver that performs the comparison test can be difficult. This paper describes the design of a novel array receiver for M-ary PPM/O-CDMA (M = 4) where the received signal is mapped onto an xy-plane whose quadrants define the PPM slot decision by means of an associated control law. The receiver does not require buffering or nonlinear operations. In this paper we describe a planar lightwave circuit (PLCs) implementation of the receiver. We give detailed numerical simulations that test the concept and investigate the effects of multi-access interference (MAI) and optical beat interference (OBI) on the slot decisions. These simulations provide guidelines for subsequent experimental measurements that will be described.

Citation Download Citation

A. J. Mendez, V. J. Hernandez, R. M. Gagliardi, and C. V. Bennett "Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)", Proc. SPIE 6457, Free-Space Laser Communication Technologies XIX and Atmospheric Propagation of Electromagnetic Waves, 64570H (13 February 2007); https://doi.org/10.1117/12.725384

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