A High Dimensional Signal Space Implementation of FDTS / DF

Detector + n k a k y k â k-+ – n k M-i0 p i y k BLOCKINi 2 M-i0 q i y k BLOCKINi 2 y k y k y k y k a k f 0 a k BLOCKIN1 f 1 à a k BLOCKIN-f-y k BLOCKIN1 y k BLOCKIN1 ˆ a k BLOCKIN-BLOCKIN1 f-a k BLOCKIN1 f 0 à a k BLOCKIN-f-BLOCKIN1 y k BLOCKIN-y k BLOCKIN-M-j1 ˆ a k BLOCKIN-BLOCKINj f j a k BLOCKIN-f 0 M-i0 w i y k BLOCKINi Fig. 1. A linear AWGN channel with a decision feedback detector. Abstract—A procedure for designing FDTS/DF as a high dimensional signal space detector is presented. The procedure is applied to the three dimensional case to illustrate the resulting detector structure. An equalization and code constraint reduce the number of boundaries and to eliminate the multipliers from the general case. Simulation results show this new channel outperforms EPRML for user densities of 2.25 and higher.