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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | June Chul Ron Batra, A. Waters, D. |
| Copyright Year | 2007 |
| Description | Author affiliation: Texas Instrum., Dallas (June Chul Ron; Batra, A.; Waters, D.) |
| Abstract | Traditional OFDM systems use a cyclic prefix (CP) to simplify the processing at the receiver. In power-limited systems, such as those which use the ultra-wideband (UWB) spectrum, using a CP has a big disadvantage. The CP introduces structure into the transmitted signal and as a result, ripples in the power spectral density. These ripples necessitate a power back-off at the transmitter in order to comply with FCC requirements and reduces the overall range. The multi-band OFDM (MB-OFDM) system eliminates these ripples by employing a zero-padded suffix (ZPS) instead of a CP. To retain the circular convolution property, the receiver for a MB-OFDM system needs to use an overlap-and-add (OLA) technique to combine the original samples (those intended for the FFT) and additional samples that are equal to the length of the suffix. When the memory of the channel is shorter than that of the suffix, the OLA technique with samples equal to the suffix can result in SNR loss due to adding samples that contain only noise. In this paper, we present an algorithm that adaptively selects the appropriate number of samples to use in the OLA technique. This algorithm generates an estimate of the channel length based on the time-domain preamble sequence. |
| Starting Page | 1331 |
| Ending Page | 1335 |
| File Size | 3006118 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781424421091 |
| ISSN | 10586393 |
| DOI | 10.1109/ACSSC.2007.4487443 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-11-04 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Transmitters FCC Convolution Time frequency analysis Bandwidth OFDM modulation Noise robustness Switches Digital signal processing Research and development |
| Content Type | Text |
| Resource Type | Article |
| Subject | Signal Processing Computer Networks and Communications |
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