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Smart antenna technology is a key technology adopted in TD-SCDMA communication system. There are two main functions of smart antenna, including DOA estimation and beamforming. It is usually difficult to implement the function of smart antenna directly in TD-SCDMA system simulation in OPNET, which is a network simulation tool suited for system level simulation. In this paper, two simulation methods...
Smart antenna technique is one of the most important techniques used in TD-SCDMA system. Setting up a methodology to implement smart antennas based on TD-SCDMA system level simulation platform is useful for analyzing the influences of smart antennas on the whole communication system. Generally speaking, smart antennas can be divided into two kinds, one is fixed multi-beam switching antenna and the...
Slow dynamic channel allocation (Slow DCA) is a key technology used to support asymmetrical services between uplink and downlink in TD-SCDMA system, which may cause cross-slot interference when a cell is active in downlink slot while an adjacent one is in uplink slot. The crossed slot existing among adjacent cells will seriously affect the system performance. In this paper, we give a brief analysis...
Convergence is the main developing trend of heterogeneous networks in the future. The convergence of 3G cellular network and MANET can provide data communication service with or without an existing infrastructure only with 3G terminals. Synchronization is a critical part for any distributed system. We propose a new synchronization protocol called GTP(GPS-aided Time-syn Protocol) on the convergence...
We propose a medium access control (MAC) protocol for networks that integrated TD-SCDMA and Ad hoc networks. The protocol is collision-free and TD-SCDMAand operates under dynamic and distributed circumstances; it can improve channel utilization rate and increase the number of nodes simultaneously accessible to channel by combining control channel and transmission channel in one slot, and each channel...
A novel method using concatenated code to pre-encode is proposed to reduce the impact of any system impairment and multiple access interference (MAI) in optical code division multiple access (OCDMA) system. The bit error rate (BER) performance is derived taking into some noise and the MAI. From both theoretical analysis and numerical results, we can be able to show that the proposed system has good...
In this paper, a passive optical network (PON) based on optical code division multiple access (OCDMA) is presented, and analyzed in detail. The proposed system can be applied to an optical access network with full services on demand, such as internet protocol, video on demand, telepresence and high quality audio. An OCDMA-PON combines advantages of PON and OCDMA technology. Simulation result elicits...
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