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

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-lo...

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Bibliographic Details
Main Authors: Lopez-Perez, J, Perez-Alvarez, I.A, Zazo-Bello, S, Melian-Gutierrez, L.B, Amaro-Garcia, A
Format: Conference Proceeding
Language:English
Subjects:
Algebra
Communication switching
Modulation and coding methods
Radio links and equipment
Online Access:Get full text
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Summary: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.
DOI:10.1049/cp.2009.0068