An Energy Efficient Sub-Band Based UWB Receiver and Its Performance Improvement by Interference Rejection Filtering

Nair, Jinesh P.; Bynam, Kiran; Naniyat, Arun

doi:10.1109/iccw.2010.5503898

Cited by 3 publications

(9 citation statements)

References 5 publications

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“…The concept of sub-banding proposed in [3], [4] for UWB systems facilitates this control of bandwidth and transmit power. Here, the UWB bandwidth ≥ 500 MHz is divided into number of sub-bands.…”

Section: A Backgroundmentioning

confidence: 99%

“…The bandwidth allocated to a user with flexibility for diversity or rate enhancement may be formed by aggregating disjoint portions of the 500 MHz UWB spectrum, even though the aggregated bandwidth is not an integer multiple of the sub-band bandwidth. This is unlike the system described in [3] and [4]. Moreover, the bandwidth resources can be allocated at integral multiples of the OFDM subchannel bandwidth.…”

Section: A Ofdm-suwb Transmittermentioning

confidence: 99%

“…Among the existing ultra wideband (UWB) systems, impulse radio UWB (IR-UWB) supports low data rates of the order of a few Mbps and multi-band orthogonal frequency division multiplexing (MB-OFDM) systems support very high data rates of the order of 500 Mbps [1], [2]. In order to address the data rate requirements intermediate to these two, recently a Sub-band based Ultra-wideband System (SUWB) was proposed for energy efficient medium data rate communications over short ranges [3] and [4]. It was seen that significant power savings of the order of around 30% can be obtained in such systems in comparison to full band systems with scalable data rates ranging from 12.5 Mbps to 62.5 Mbps.…”

Section: Introductionmentioning

confidence: 99%

“…However, the existing SUWB system in [3] and [4] do not incorporate methods to mitigate the multi-path effects induced by the UWB channel. The performance degradation is very severe when the data rate increases.…”

Section: Introductionmentioning

confidence: 99%

“…Here OFDM is used on a per-sub-band basis for channel mitigation at the sub-sampled rate. The OFDM-SUWB system proposed here has several advantages compared to the existing SUWB system in [3] and [4]. The existing SUWB system calls for the codes to have ideal correlation properties at non-zero lags.…”

Section: Introductionmentioning

confidence: 99%

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

Nair

Jos

Naniyat

2012

2012 IEEE Wireless Communications and Networking Conference (WCNC)

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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.

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Section: A Backgroundmentioning

confidence: 99%

Section: A Ofdm-suwb Transmittermentioning

confidence: 99%