Description

In the TD-SCDMA system, a single-frequency cell (1.6 MHz bandwidth) has a theoretical capacity of *3 AMR *2.2 kbps voice users, or 6 PS *4/*4 kbps packet data service channels. A *-carrier N-frequency cell (5 MHz bandwidth) has a theoretical capacity of *1 AMR *2.2 kbps voice channels, or *8 PS *4/*4 kbps packet data service channels. Compared with other 3G systems with the same frequency resources, TD-SCDMA offers a larger system capacity:

• For voice services, TD-SCDMA frequency utilization is *5 users/MHz/cell, while that of UMTS and of cdma***0 are 6 users/MHz/cell and 8 users/MHz/cell respectively. For data services, that of TD-SCDMA is 1.*5 Mbps/MHz/cell, while that of UMTS and cdma***0 are 0.4 Mbps/MHz/cell and 1.0 Mbps/MHz/cell respectively. With the same spectrum width, the TD-SCDMA system can support more users and provide higher throughput.
• The TD-SCDMA system adopts FDMA /TDMA/CDMA modes, which offer a high spectrum utilization and higher system capacity.
• The TD-SCDMA system adopts smart antennas and joint detection technology to make full use of the space division feature, reducing intra-cell and inter-cell interference and improving system capacity.
• The TD-SCDMA system is a synchronous system. Ideally, the signals from various terminals on the uplink are fully synchronized at the Node B demodulator to ensure that various code channels of the orthogonal spread code maintain orthogonality during the de-spread process, without Multiple Access Interference (MAI) for higher system capacity.
•