D. S. S. Srivastava, S. Tripathi and A. Chaturvedi, "Resource Optimization in CDMA based Wireless Ad Hoc Networks," BTP Report, April 2002.  Home/Search   Document Details and Download   Summary   Related Articles

....Codes 1) Walsh Codes: Two codes are said to be orthogonal if they have zero cross correlation. Hadamard transform [2]is one of the best known techniques to generate orthogonal codes. Walsh codes are generated by applying Hadamard transform upon 1 repeatedly. Hadamard transform is given by H 0 = [1] H n = Each row of the 2 2 matrix H n gives the 2 bit code for a user. 2) Orthogonal Variable Spreading Factor Codes: CDMA provides support for variable spreading factor codes. These codes have different lengths and it is required that these variable length codes be orthogonal to ....

....two codes CN (2i) CN 1 (i) CN 1 (i) and CN (2i 1) CN 1 (i) CN 1 (i) where denotes the concatenation operation. C. MC CDMA System There are various variants of CDMA like DS CDMA, MT CDMA, MC CDMA [3] etc. In our study we use MCCDMA based on the simulation results on BER shown in [1]. MC CDMA is a digital modulation technique where a single data symbol is transmitted at multiple narrowband subcarriers where each subcarrier is encoded with a phase offset of 0 or p based on a spreading code. The narrowband subcarriers are separated by a frequency 1=T b at baseband, where T b is ....

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D. S. S. Srivastava, S. Tripathi and A. Chaturvedi, "Resource Optimization in CDMA based Wireless Ad Hoc Networks," BTP Report, April 2002.

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