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Sub-sampled OFDM based sub-band ultra-wideband system

J. P. Nair ; Debarati Sen (Institutionen för signaler och system) ; S. Jos ; A. Naniyat
IEEE Wireless Communications and Networking Conference, WCNC 2012, Paris, 1-4 April 2012 (1525-3511). p. 48-53. (2012)
[Konferensbidrag, refereegranskat]

In sub-band ultra-wideband (SUWB) systems, the use of spreading codes in conjunction with sub-banding enables energy efficient reduced sampling rate receiver designs. In this work, the orthogonal frequency division multiplexing (OFDM) technique is proposed for SUWB systems as a means to mitigate the multipath fading effects of the channel. The OFDM demodulation performed at the sub-sampled rate with reduced number of discrete Fourier transform (DFT) points provides scope for low power receiver implementations. Moreover, OFDM improves the flexibility as bandwidth resources can be allocated with improved granularity at integral multiples of the OFDM sub-channel bandwidth. The requisite correlation properties of the spreading codes is relaxed in the proposed OFDM-SUWB system and more number of spreading codes can be used when compared to the existing SUWB system. Also, a simple channel estimation method exploiting the low complexity advantage of the inherent spreading code based receiver is proposed. Simulation results in terms of the bit error rate (BER) performance are presented over the IEEE 802.15.4a channel models and also comparisons with the multi-band OFDM (MB-OFDM) system are made demonstrating the usefulness of the proposed scheme.

Nyckelord: Sub-banding, Sub-sampled OFDM, UWB, Bandwidth resource, Bit error rate (BER) performance, Channel estimation method, Channel model, Correlation properties, Energy efficient, IEEE 802.15.4a, Integral multiples, Low power receiver, MB-OFDM, Multiband OFDM, Multipath fading effects, OFDM demodulation, Receiver design, Sampling rates, Spreading codes, Subbands, Ultra wide band systems, Broadband networks, Discrete Fourier transforms, Energy efficiency, Wireless telecommunication systems, Orthogonal frequency division multiplexing

Denna post skapades 2012-09-11. Senast ändrad 2013-12-03.
CPL Pubid: 163184


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Institutionen för signaler och system


Elektroteknik och elektronik

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