Sub-sampled OFDM based sub-band ultra-wideband system
Paper i proceeding, 2012

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.

Discrete Fourier transforms

IEEE 802.15.4a


Channel model

Multiband OFDM

Receiver design

Bandwidth resource

Orthogonal frequency division multiplexing

Channel estimation method

OFDM demodulation


Sub-sampled OFDM


Correlation properties

Energy efficiency

Multipath fading effects

Low power receiver

Energy efficient

Integral multiples

Wireless telecommunication systems

Ultra wide band systems

Broadband networks

Spreading codes


Bit error rate (BER) performance

Sampling rates


J. P. Nair


Debarati Sen

Chalmers, Signaler och system, Kommunikation, Antenner och Optiska Nätverk

S. Jos


A. Naniyat


IEEE Wireless Communications and Networking Conference, WCNC

15253511 (ISSN)

48-53 6214416
978-146730437-5 (ISBN)


Elektroteknik och elektronik





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