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By Caprara A.

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Ns − 1, where bi,l is the complex information at the lth subcarrier of the ith symbol, and NFFT is the size of the IDFT. 10) is an OFDM symbol, which effectively divides the frequency spectrum (528 MHz) into overlapping but orthogonal sub-bands by using NFFT subcarriers and transmits information symbols (bi,l ) at each subcarrier [89]. e. bi,0 = 0). The subcarriers are classified into data subcarriers, pilot subcarriers and guard subcarriers. According to the standard, there are 100 data subcarriers, which are used to carry information, whereas there exist 12 pilot subcarriers, which transmit known data for the purposes of signal parameter estimation at the receiver.

3a task group was dissolved, the WiMedia Alliance had Ecma International6 approve their WPAN standard based on MB-OFDM UWB technology. 1. In addition to high-rate WPAN applications, UWB signals have also been considered for low-rate WPANs that focus on low power and low complexity devices. 4 standard for an alternative PHY. 4a provides high-precision ranging/location capability, high aggregate throughput and ultra-low-power consumption. 2. 8 GHz, interference mitigation techniques are not required until the end of 2008.

The RS encoder takes a block of 330 bits at a time, and adds 48 parity bits according to a generator polynomial specified in the standard. 87. Then, the encoded bits from the RS encoder are encoded by a convolutional encoder with a rate of 1/2. Each pair of encoded bits is carried by one UWB symbol. A UWB symbol structure is shown in Fig. 18, where the symbol duration Tsym is divided into two intervals, denoted as TBPM . At each symbol interval, one burst of UWB pulses is transmitted, and the location of the burst in either the first or the second interval indicates one bit of information.

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A 3/4-Approximation Algorithm for Multiple Subset Sum by Caprara A.


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