Transmission over UWB channels with OFDM system using LDPC coding

Grzegorz Dziwoki; Marcin Kucharczyk; Wojciech Sulek

doi:10.1117/12.837346

5 August 2009 Transmission over UWB channels with OFDM system using LDPC coding

Grzegorz Dziwoki, Marcin Kucharczyk, Wojciech Sulek

Proceedings Volume 7502, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2009; 75021Q (2009) https://doi.org/10.1117/12.837346
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2009, 2009, Wilga, Poland

Abstract

Hostile wireless environment requires use of sophisticated signal processing methods. The paper concerns on Ultra Wideband (UWB) transmission over Personal Area Networks (PAN) including MB-OFDM specification of physical layer. In presented work the transmission system with OFDM modulation was connected with LDPC encoder/decoder. Additionally the frame and bit error rate (FER and BER) of the system was decreased using results from the LDPC decoder in a kind of turbo equalization algorithm for better channel estimation. Computational block using evolutionary strategy, from genetic algorithms family, was also used in presented system. It was placed after SPA (Sum-Product Algorithm) decoder and is conditionally turned on in the decoding process. The result is increased effectiveness of the whole system, especially lower FER. The system was tested with two types of LDPC codes, depending on type of parity check matrices: randomly generated and constructed deterministically, optimized for practical decoder architecture implemented in the FPGA device.

Citation Download Citation

Grzegorz Dziwoki, Marcin Kucharczyk, and Wojciech Sulek "Transmission over UWB channels with OFDM system using LDPC coding", Proc. SPIE 7502, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2009, 75021Q (5 August 2009); https://doi.org/10.1117/12.837346

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