Multicarrier and spread-spectrum systems

R&D
multicarrier_img1.jpg
R&D
multicarrier_img2.jpg
R&D
multicarrier_img3.jpg
R&D
multicarrier_img4.jpg

We are experts on application of wideband modulations to varying multipath channels such as the ionospheric HF channel, the Power Line channel or the wireless channel. We have developed complete modems using Direct Sequence and Frequency Hopping Spread spectrum (DS-SS and FH-SS) as well as Orthogonal Frequency Division Multiplexing (OFDM). When a non constant envelope waveform is transmitted, the problem of Peak to Average Power Ratio (PAPR) appears. We have developed some techniques to overcome this problem based on receiver post-processing. We are also experts on adaptive techniques for MC-CDMA and OFDMA systems, and also in SC-FDE and SC-FDMA when low power is available at the transmitter. We are able to cover all the phases of the modem development, from the simulation phase to the final prototype design.

Electronics & Communications Ricard Aquilue raquilue@salle.url.edu


Most relevant projects

Wideband Power-Line Carrier: Viability analysis

Since the beginning of 20th century, the power line high voltage (HV) network has been exploited as a communications medium.

Communications - Multicarrier and spread-spectrum systems

Automatic Meter Reading System: Physical Layer Specification

The introduction of an automatic meter reading (AMR) system can offer several advantages related to the capacity of sending and receiving data between the customer and the electrical utility.

Communications - Multicarrier and spread-spectrum systems

WPLC-Prototype: Wideband Power Line Carrier - Prototype

Previous work with Endesa Network Factory S.L. (WPLC-Viability) showed that the high voltage power line channel can be exploited in a more efficient way it is done nowadays.

Communications - Multicarrier and spread-spectrum systems