Luca Fanucci; et al's An experimental approach to CDMA and interference mitigation PDF

By Luca Fanucci; et al

ISBN-10: 1402025378

ISBN-13: 9781402025372

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Extra resources for An experimental approach to CDMA and interference mitigation : from system architecture to hardware testing through VLSI design

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64) c 2 m L  Q k . 66) and we eventually obtain the following decision variable for data detection zk A ˜ dk  Q k . 67) Such a decision strobe is eventually passed to the final detector, which is just a slicer to regenerate the transmitted digital data stream if no channel coding is used. The cascade of multiplication, accumulation, and downsam- 38 Chapter 2 pling produces a ‘sufficient statistics’ which is the same as in a conventional matched filter narrowband receiver. 56) and the local code replica, and the downsampling is aimed at taking the maximum of the correlation.

56) and the local code replica, and the downsampling is aimed at taking the maximum of the correlation. This is why the detector in Figure 2-8 is also called the Correlation Receiver (CR). 67) is exactly the same we would obtain in the case of a conventional narrowband transmission of complex-valued symbols dk over AWGN channel and using a matched filter receiver. Therefore the spreading and despreading operations, carried out in the transmitter and receiver, respectively, are completely transparent to the final user.

41) 32 Chapter 2 A widely used method for the generation of a binary spreading sequence {ck } is based on an m stage Linear Feedback Shift Register (LFSR) used as a binary sequence generator. The feedback taps of the circuit are properly set to yield a sequence with particular features which are desirable for SS transmissions [Dix94], [Pic82], [Sim85], [Din98]. According to the polynomial theory [Pet72], it is possible to select the feedback taps so as to obtain a sequence with the longest possible repetition period L 2m  1 and good correlation properties [Sar80], the so called maximal length or m-sequences.

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An experimental approach to CDMA and interference mitigation : from system architecture to hardware testing through VLSI design by Luca Fanucci; et al


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