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

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Starting from this consideration we can devise an access system allowing multiple users to share a common channel transmitting their data in DS/SS format. This can be achieved by assigning each user a different spreading code and allowing all the signals simultaneously access, in DS/SS mode, the same frequency spectrum. All the user signals are therefore transmitted at the same time and over the same frequency band, but they can nevertheless be identified thanks to the particular spreading code used, which is different from one user to another (the so called signature code).

PSD of a spreading code for DS/SS transmissions, M=8. Concerning correlation properties, we define first the following periodic cross-correlation sequence between the two generic binary sequences {ak } and {bk } , ak , bk {-1,+1} Rab i 1 L 1 ˜ ¦ ak ˜ b k i . 42) 2. 43) The (periodic) autocorrelation sequence of the sequence {ck } is also given by Rcc i 1 L 1 ˜ ¦ ck ˜ c k i . 44) We can easily show that the autocorrelation sequence of an m-sequence is i 0, ­1 Rcc i ® ¯1 L i z 0. 45) Such an autocorrelation function is similar to that of a delta-correlated white noise process.

Furthermore, taking the battery capacity limit into account, the use of dedicated hardware becomes mandatory to reduce power consumption. , the possibility to re-use a single design for multiple applications) which is clearly illustrated in Figure 1-12 for various implementation styles [Rab00]. An amazing three orders of magnitude vriation of energy efficiency (as measured in MOPS/mW) can be observed between an ASIC (Application Specific Integrated Circuit) style solution and a fully programmable implementation on an embedded processor.

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