By Luca Fanucci, Marco Luise, Filippo Giannetti, Massimo Rovini
An Experimental method of CDMA and Interference Mitigation used to be written with the admittedly formidable purpose of filling the distance among conversation concept and VLSI implementation, and therefore to supply a extra general/theoretical method of the layout, improvement, and trying out of a CDMA receiver. accordingly, the recommendations and methods which are awarded become appropriate to a extra basic form of electronic instant modems when it comes to receiver structure layout and implementation.
As the reader will simply discover, the topic of electronic modem layout and implementation is addressed within the e-book ranging from a theoretical technique (supported by way of right bibliographic references), and is via program concerns, with regards to an ESA scan assumed as a case examine. a whole layout movement, from specification to implementation, together with checking out and ultimate verification is then awarded. This leads the reader step by step to a radical knowing of CDMA transmission and detection, and constitutes a realistic suggestions for the layout of VLSI instant cellular terminals.
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Extra resources for An Experimental Approach to CDMA and Interference Mitigation: From System Architecture to Hardware Testing through VLSI Design
13 µm and below) second order effects (such as crosstalk, electro-migration and wire delays which can be more important than gate delays). These observations, combined with an intense pressure to reduce the time to market, requires a design paradigm shift comparable with the advent of the driving of ASIC design by cell libraries in the early 1980s, to move to the next design productivity level by further raising the level of abstraction. To this aim, recently the use of platforms at all of the key articulation points in the SoC design has been advocated [Fer99].
But a problem arises when we run out of codes, and more users ask to access the network. With reasonable spreading factors (up to 256), the number of concurrently active channels is too low to serve a large users population like we have in a large metropolitan area, or a vast suburban area. This also applies to conventional FDMA or TDMA radio networks where the number of channels is equal to the number of carriers in the allocated bandwidth or the number of time slots in a frame, respectively. The solution to this issue lies in the notion of cellular network with frequency re-use as outlined in Section 2 of Chapter 1.
In the case of the uplink of a wireless cellular system, the DS/SS signals within a single cell (or beam) are originated from sparse terminals which have different signature epochs, thus resulting in Asynchronous CDMA (ACDMA). 106) L where Wi , Ti and 'f i represent the timing, carrier phase, and carrier frequency offsets, respectively, of the ith interfering channel with respect to the useful one. 106) are, in general, unequal. This is owed to the different propagation loss experienced by each user signal originating from a different spatial location, 53 2.