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Branch-and-bound-based fast optimal algorithm for multiuser detection in synchronous CDMA

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4 Author(s)
Luo, J. ; Inst. for Syst. Res., Maryland Univ., College Park, MD, USA ; Pattipati, K. ; Willett, P. ; Brunel, L.

A fast optimal algorithm based on the branch and bound (BBD) method is proposed for the joint detection of binary symbols of K users in a synchronous code-division multiple access (CDMA) channel with Gaussian noise. Relationships between the proposed algorithms (depth-first BBD and fast BBD) and both the decorrelating decision feedback (DF) detector and sphere decoding (SD) algorithm are clearly drawn. It turns out that decorrelating DF detector corresponds to a "one-pass" depth-first BBD; sphere decoding is in fact a type of depth-first BBD, but one that can be improved considerably via tight upper bounds and user ordering as in our fast BBD.

Published in:

Communications, 2003. ICC '03. IEEE International Conference on  (Volume:5 )

Date of Conference:

11-15 May 2003

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