In this paper, prefiltering techniques for Sphere Detection (SD) in frequency-selective channels are examined. It is shown that a link between QL-factorization of the channel matrix and minimum-phase prefiltering exists. As a result, it ispossible to regard SD as a generalization of traditional reducedstate sequence estimation, providing a unifying framework for the two detection methods. It is illustrated how minimum-phase prefiltering or the Linear Minimum Mean-Square Error Decision Feedback Equalization (LMMSE-DFE) forward filter is capable of reducing the complexity of sphere detectors significantly, while still obtaining near-optimal performance. The significant reduction in complexity is obtained as prefiltering enables earlier decision making in SD. Simulations carried out in an EDGE system confirm that prefiltering leads to a considerable complexity reduction for sphere detectors.
|Title of host publication||Global Telecommunications Conference, GLOBECOM '07. IEEE, 26-30 Nov. 2007|
|Publication status||Published - 2007|
|Event||2007 IEEE Global Telecommunications Conference - Washington, United States|
Duration: 25 Nov 2007 → 30 Nov 2007
Conference number: 50
|Conference||2007 IEEE Global Telecommunications Conference|
|Period||25/11/2007 → 30/11/2007|