An Experimental Approach to CDMA and Interference by Luca Fanucci, Marco Luise, Filippo Giannetti, Massimo Rovini

By Luca Fanucci, Marco Luise, Filippo Giannetti, Massimo Rovini

An Experimental method of CDMA and Interference Mitigation was once written with the admittedly formidable rationale of filling the distance among verbal exchange conception and VLSI implementation, and hence to supply a extra general/theoretical method of the layout, improvement, and checking out of a CDMA receiver. thus, the strategies and strategies which are offered turn into acceptable to a extra normal 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 ebook ranging from a theoretical procedure (supported through right bibliographic references), and is via software matters, almost about an ESA scan assumed as a case learn. an entire layout move, 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 assistance for the layout of VLSI instant cellular terminals.

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Assuming that W w2 , we have ^ d I , k , dQ ,k  r1, r 3, ! 12) and therefore Ad2 2˜ W 1 . 13) Whilst W-QAM is widely used in wireline modems, satellite communications more often rely on Phase Shift Keying (PSK) constellations. 14) 2. Basics of CDMA for Wireless Communications 25 so that Ad2 1 . 15) The two classes of PSK and QAM signals have a common element, since the two formats of 4-QAM and 4-PSK (or Quadrature Phase Shift keying, QPSK) are equivalent. 17) as the Fourier transform of the (discrete time) data autocorrelation sequence ^ ` Rdd  k E dm ˜ dm*  k .

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. Of course, frequency reuse has an impact on the overall network efficiency in terms of users/cell (or users/km2) since the number of channels allocated to each cell is a fraction 1/Q of the overall channels allocated to the provider, where Q is the frequency re-use factor (the number of cells in a cluster).

The same channels) are used within each cell/beam on the same carrier. Of course, something has to be done to prevent neighboring users at the edge of two adjacent cells/beams and using the same WH code to heavily interfere with each other. 102). In a sense, we use a sort of code re-use technique, where code refers to the (orthogonal) channelization codes in each cell/beam.

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