US 2006/0078042 A1Published application

Decoding method using adaptive step-size algorithm for a space-time coded DS-CDMA system

AssigneeSeoul National University Industry Foundation

InventorsJae Lee, Joo Yi

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Abstract

Disclosed is a method for decoding received signals on communication channels between at least one transmit antenna and plural receive antennas in a space-time coded direct sequence (DS)-CDMA communication system. The decoding method includes steps of: adjusting the step-size which is an update unit for the tap weight vector for despreading received signals; updating the tap weight vector using the step-size; and despreading the received signals using the tap weight vector. According to the decoding method, the optimal performance can be achieved because the tap weight vector and the step-size are adaptively updated according to changes of communication environment. Such superior performance is more remarkable as the number of receive antennas and transmit antennas increases.

Claims9

Dependent claims

A method for decoding received signals on the communication channels between at least one transmit antenna and plural receive antennas in the space-time coded direct sequence (DS)-CDMA communication system, comprising steps of:

(a) obtaining an error value between (i) a despread signal χmp({circumflex over (x)}k(i)) corresponding to {circumflex over (x)}k(i) determined as the received symbol in the i-th symbol time, and (ii) a despread signal ykp(i) of received signal r(i) in the i-th symbol time for the k-th user of the p-th path at the m-th receive antenna;
(b) adjusting step-size, which is an updating unit for a tap weight vector for despreading received signals, using the error value obtained in the step (a);
(c) updating the tap weight vector using the error value obtained in the step (a) and the step-size obtained in the step (b);
and
(d) despreading a received signal r(i+1) in the (i+1)-th symbol time using the tap weight vector obtained in the step (c).

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Dependencies are inferred from the claim text.