Decoder-aided multidata detection of COFDM-CDMA waveforms on HF multipath/fading channels

John Nieto

doi:10.1117/12.720224

3 May 2007 Decoder-aided multidata detection of COFDM-CDMA waveforms on HF multipath/fading channels

John Nieto

Proceedings Volume 6577, Wireless Sensing and Processing II; 65770C (2007) https://doi.org/10.1117/12.720224
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is a widely used technique for data transmission on multipath fading channels. The multipath component of these types of channels causes a phenomenon known as frequency selective fading. This type of fading can severely degrade or completely eliminate the signal energy of many of the OFDM tones producing an irreducible error rate, even when no noise is present. In the early 1990's, researchers combined some of the characteristics of Code Division Multiple Access (CDMA) and Spread Spectrum (SS) with OFDM in order to create a more robust modulation scheme capable of surviving frequency selective fading without the need for forward error correction (FEC) techniques and thus OFDM-CDMA was born. Similar to OFDM, FEC coding can be added to OFDM-CDMA waveforms to further improve performance (referred to as COFDM-CDMA). An additional performance improvement possible for COFDM-CDMA is to exploit the output of the FEC decoder in an iterative fashion. This paper will investigate the possible performance benefits of feeding back the decoded FEC data bits to the mutiuser (i.e. multidata) detection (MUD) scheme of COFDM-CDMA waveforms on various HF multipath/fading channels.

Citation Download Citation

John Nieto "Decoder-aided multidata detection of COFDM-CDMA waveforms on HF multipath/fading channels", Proc. SPIE 6577, Wireless Sensing and Processing II, 65770C (3 May 2007); https://doi.org/10.1117/12.720224

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available