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Oversaturating synchronous CDMA systems using collaborative coding

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2 Author(s)
Paavola, J. ; Dept. of Inf. Technol., Turku Univ., Finland ; Ipatov, V.

Oversaturated synchronous CDMA system is proposed based on collaborative coding, where data bits of group of L + s users are jointly one-to-one mapped onto 2L+s L-dimensional signal vectors. Instead of the unique signature per each user, the L-dimensional signature subspace is used to transmit bits of L + s users (s > 0). All signature subspaces are orthogonal to each other which simplifies the optimal receiver structure. With signal space dimension N, the number of users is K = N(1 + s/L). Preferable collaborative codes are found using the sphere packing theory for L = 2...5, s = 1, 2. Trade-off between oversaturation efficiency and energy loss/gain is evaluated against the conventional non-oversaturated orthogonal CDMA.

Published in:

Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on  (Volume:4 )

Date of Conference:

5-8 Sept. 2004