Patent ID: 6934245
Filing Date: 2005-08-23
Classification: H04B,H04L

Abstract:
1. An apparatus for indicating enablement of transmit diversity of primary common control physical channel in a CDMA (Narrow Band Time Division Duplexing Code Division Multiple Access) mobile communication system, wherein a plurality of frames constituting a multiframe each include two subframes, each of said subframes including (i) a plurality of time slots each having data symbol fields scrambled with a given scrambling code and a midamble field indicating the given scrambling code, and (ii) a downlink pilot time slot having a synchronization code, intervening between first and second time slots of said plurality of time slots, wherein two adjacent frames make a frame pair, the apparatus indicating enablement of transmit diversity through at least two antennas by phase modulation of the synchronization codes in the downlink pilot time slots in each frame pair, the apparatus comprising: a transmit diversity enable/disable controller for storing a plurality of patterns each comprised of a plurality of different phase modulation angles to indicate enablement of the transmit diversity, and sequentially outputting the phase modulation angles according to the usage of the transmit diversity in a unit of the patterns; and a multiplier for phase modulating the synchronization codes sequentially received in a unit of a predetermined number of chips with the phase modulation angles output from the transmit diversity enable/disable controller on a one-to-one basis, and outputting the phase-modulated synchronization codes as the synchronization codes in the downlink pilot time slots in each frame pair.