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

By Luca Fanucci; et al

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Also, the cross-correlation properties of m-sequences are not optimal, so they result in significant levels of MAI. 85) can be canceled by using orthogonal codes such as Rc( i ) c( j ) 0 ( i z j ). , the sign inversion) of each element of the matrix H m . 101) it is apparent that for a given period L the WH set is composed of L sequences. 68). Despite such an appealing feature, it must be noticed that the WH sequences exhibit very poor off zero auto- and cross-correlation properties making difficult initial code acquisition and user recognition by the receiver.

For this reason the overlay code is also called scrambling code. , Rc( i ) c( j ) 0 ( i z j ) still holds true. Finally, notice that if we want to obtain a composite code having exactly the same period L 2m as the original WH sequence we must select an overlay maximal length sequence having period 2m  1 , and properly extend it by inserting a ‘+1’ chip into its longest run. Such a modified sequence is called Extended PN (E-PN). 67). Other sets of codes widely used as spreading sequences in practical CDMA systems are the quasi-orthogonal ones.

Introducing Wireless Communications 15 plication of more sophisticated multiple-access, digital modulation and processing techniques in order to accommodate the tremendous growth in the number of subscribers, thus offering vastly increased functionality with better quality of service. In Figure 1-11 we have illustrated the processor performance (according to Moore’s Law) together with a qualitative indication of the algorithm complexity increase (approaching the theoretic performance limits imposed by Shannon’s theory), which leaps forward whenever a new wireless generation is introduced, as well as the available battery capacity, which unfortunately increases only marginally [Rab00].

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