Impact of CSI latency on HF multi-carrier communications for delay-sensitive applications

Author

Lopez-Perez, J. ; Perez-Alvarez, I.A. ; Zazo-Bello, S. ; Melian-Gutierrez, L.B. ; Amaro-Garcia, A.

Author_Institution

Dipt. de Senales y Comun., Univ. de Las Palmas de Gran Canaria (ULPGC), Las Palmas

fYear

2009

fDate

28-30 April 2009

Firstpage

1

Lastpage

5

Abstract

Multi-carrier modulations are widely used in HF communications, and particularly OFDM. Delay-sensitive applications can make use of spreading schemes such as OFDM-CDM in order to cope with deep nulls in the channel. If CSI is known at transmitter, it is possible to improve performance using a bit-loading algorithm for OFDM and channel matrix SVD decomposition for OFDM-CDM. If a source of non-ideality in CSI due to latency is taken into consideration, it is shown how performance decreases. A receiver-side technique is applied to OFDM-CDM communications to compensate for delay-incurred matrices mismatch.

Keywords

OFDM modulation; code division multiplexing; singular value decomposition; wireless channels; CSI; HF multicarrier communication; OFDM-CDM communication; bit-loading algorithm; channel matrix SVD decomposition; delay-incurred matrices; delay-sensitive application; receiver-side technique; Ionospheric channel; OFDM; bit-loading; singular value decomposition;

fLanguage

English

Publisher

iet

Conference_Titel

Ionospheric radio Systems and Techniques, 2009. (IRST 2009). The Institution of Engineering and Technology 11th International Conference on

Conference_Location

Edinburgh

ISSN

0537-9989

Print_ISBN

978-1-84919-123-4

Type

conf

Filename

5235563