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 conception and VLSI implementation, and hence to supply a extra general/theoretical method of the layout, improvement, and trying out of a CDMA receiver. in this case, the suggestions and methods which are offered change into acceptable to a extra normal type of electronic instant modems by way of receiver structure layout and implementation. because the reader will simply discover, the topic of electronic modem layout and implementation is addressed within the booklet ranging from a theoretical process (supported through right bibliographic references), and is via software concerns, near to an ESA scan assumed as a case learn. a whole layout movement, from specification to implementation, together with trying out and ultimate verification is then offered. This leads the reader step by step to an intensive knowing of CDMA transmission and detection, and constitutes a pragmatic counsel for the layout of VLSI instant cellular terminals.
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Additional resources for An Experimental Approach to CDMA and Interference Mitigation: From System Architecture to Hardware Testing through VLSI Design
Tables for the configurations of m-sequence generators are easily found in the literature [Dix94], [Pic82]. In an m-sequence the number of logical ‘0’s and ‘1’s is 2m1 1 and 2m1 , respectively [Dix94]. Since in all practical cases we have L 1 the occurrence rate of each symbol is virtually the same within each period, so that such sequences are called balanced. A deeper analysis of the location of ‘0’s and ‘1’s within one period also reveals that the blocks of consecutive identical symbols (the so called runs) follow a given distribution that makes the appearance of the sequence similar to that of a truly random one [Dix94].
We then take all of the sequences obtained by adding x, y, and z with any possible (cyclical) shifts of y and z, for a total number of 2m / 2 (2m 1) sequences if | m |4 2 , and 2m / 2 (2m 1) 1 if | m |4 0 . The auto- and crosscorrelation sequences are limited to 5 particular values we will not specify here (more details can be found in Kasami’s seminal paper [Kas68], in the extensive investigation about codes correlation properties by Sarwate and Pursley [Sar80] and in the survey on spreading codes for DS-CDMA by Dinan and Jabbari [Din98]).
Baseband block diagram of a DS/SS transmitter employing two spreading sequences. The latter SS format is named Complex Spreading (CS) since it uses a complex-valued sequence to spread a stream of real-valued symbols. A performance comparison among the different spreading schemes outlined above will be presented in a subsequent Section. Now, let us focus our attention on the detection of a DS/SS signal. The simplified architecture of an I/Q receiver for a DS/SS signal is shown in Fig 2-8. The received signal undergoes I/Q baseband conversion by means of a front end such as the one depicted in Figure 2-3.
An Experimental Approach to CDMA and Interference Mitigation: From System Architecture to Hardware Testing through VLSI Design by Luca Fanucci, Marco Luise, Filippo Giannetti, Massimo Rovini