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Download An experimental approach to CDMA and interference mitigation by Luca Fanucci; et al PDF

By Luca Fanucci; et al

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

Example text

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. 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.

The ADC conversion rate of r (t ) is, in fact, invariably faster than the chip rate to perform chip matched filtering with no 41 2. Basics of CDMA for Wireless Communications aliasing problems. We shall say more about the digital architecture of the DS/SS receiver in Chapter 3 when dealing specifically with the MUSIC demodulator. ~ ~ r(t) ~ ym y(t) Chip Pulse Matched Filter 1 M g (t) R ^ ^ exp{-j2S'ft+T} Carrier Recovery mTc + W^ Code-Delay Recovery 6 M ~ zk ^ ~ dk cm Local Code Replica Figure 2-11.

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.

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