DTIC ADA518020: Frequency Domain Channel Estimation and pdf

DTIC ADA518020: Frequency Domain Channel Estimation and

More Book Details

Description of the Book:

A new frequency-domain channel estimation and equalization (FDE) scheme is proposed for single carrier (SC) underwater acoustic communications. The proposed SC-FDE employs a small training signal block for initial channel estimation in the frequency domain and converts the estimated transfer function to a desired DFT (discrete Fourier transform) size for channel equalization of the data blocks. The frequency domain equalizer is designed using the linear minimum mean square error criterion. A new phase coherent detection scheme is also proposed and deployed to combat the phase drift due to the instantaneous Doppler in the underwater channels. The channel transfer functions and group-averaged phase drift are re-estimated adaptively in a decision-directed manner for each data block in a packet, which contains M blocks of QPSK data. The proposed SC-FDE method is applied to single input multiple output (SIMO) systems using the experimental data measured off the coast of Panama City, Florida, USA, June 2007.

The uncoded bit error rate of the SIMO systems varies between 1.3% to 6.8 10(-5) when 4 tilde 8 receive hydrophones are utilized, and the source-receiver range is 5.06 km

• Creator/s: Defense Technical Information Center
• Date: 1/1/2007
• Year: 2007
• Book Topics/Themes: DTIC Archive, , MISSOURI UNIV-ROLLA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING, *UNDERWATER ACOUSTICS, *ACOUSTIC COMMUNICATIONS, *FREQUENCY DOMAIN, EQUALIZATION, DISCRETE FOURIER TRANSFORMS, RECEIVERS, INPUT OUTPUT PROCESSING, TRANSFER FUNCTIONS

An excerpt captured from the PDF book