Sub-sampled OFDM based sub-band ultra-wideband system
Paper in 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.
Sub-banding
Wireless telecommunication systems
MB-OFDM
Receiver design
Channel model
UWB
Discrete Fourier transforms
Integral multiples
Low power receiver
Multiband OFDM
Ultra wide band systems
Channel estimation method
OFDM demodulation
Bit error rate (BER) performance
Energy efficiency
IEEE 802.15.4a
Correlation properties
Energy efficient
Bandwidth resource
Orthogonal frequency division multiplexing
Broadband networks
Sub-sampled OFDM
Spreading codes
Subbands
Multipath fading effects
Sampling rates
Author
J. P. Nair
Samsung Electronics Co. Ltd.
Debarati Sen
Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner
S. Jos
Samsung Electronics Co. Ltd.
A. Naniyat
Samsung Electronics Co. Ltd.
IEEE Wireless Communications and Networking Conference, WCNC
15253511 (ISSN)
48-53 6214416978-146730437-5 (ISBN)
Subject Categories (SSIF 2011)
Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/WCNC.2012.6214416
ISBN
978-146730437-5