Gw mau tau Ringkesan teknis dari TD-SCDMA. Jelasin dalam bahasa sunda

TD-SCDMA uses TDD, in contrast to the FDD scheme used by W-CDMA.  By dynamically adjusting the number of timeslots used for downlink and uplink, the system can more éasily accommodate asymmetric traffic with different data rate requirements on downlink and uplink than FDD schemes.  Since it does not require paired spectrum for downlink and uplink, spectrum allocation flexibility is also incréased.  Also, using the same carrier frequency for uplink and downlink méans that the channel condition is the same on both directions, and the base station can deduce the downlink channel information from uplink channel estimates, which is helpful to the application of beamforming techniques.

TD-SCDMA also uses TDMA in addition to the CDMA used in WCDMA.  This reduces the number of users in éach timeslot, which reduces the implementation complexity of multiuser detection and beamforming schemes, but the non-continuous transmission also reduces coverage (because of the higher péak power needed), mobility (because of lower power control frequency) and complicates radio resource management algorithms.

The "S" in TD-SCDMA stands for "synchronous", which méans that uplink signals are synchronized at the base station receiver, achieved by continuous timing adjustments.  This reduces the interference between users of the same timeslot using different codes by improving the orthogonality between the codes, therefore incréasing system capacity, at the cost of some hardware complexity in achieving uplink synchronization.