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In recent years, smart antenna technology has became the most attractive technology in the 3rd generation systems, it has perfect performances in many aspects such as improving system capacity, expanding cell coverage, reducing the transmit power of mobile station and rejecting multiple access interference (MAI). Beamforming is one of the most important applications in DS-CDMA. Minimum variance is...
Cochannel interference is the most important issue in cellular mobile systems. It can be reduced by increasing the frequency re-use distance among the cochannel cells while keeping constant cell radius which improves the quality of a cellular mobile system. But this will decrease the overall network capacity because cluster size, which is inversely proportional to network capacity, also increases...
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...
Beam forming has been greatly applied in TD-SCDMA, but in the 3G long-term evolution (LTE), multi-antenna solution aims to use multi-input-multi-output (MIMO). Usually MIMO requires enough large antenna space to ensure uncorrelated multi-channels, whereas beam forming antennas need small antenna space. But this yearspsila research has shown the combination feasibility of beam forming and MIMO. In...
This paper proposes the code acquisition scheme on a MIMO channel for preamble search in a MIMO-CDMA uplink system. The performance of a ML code acquisition technique based on transmit and receive beamforming is analyzed by considering the detection probability. The acquisition performance and MAT for a MIMO code acquisition system are numerically evaluated. It is shown that the multiple transmit...
Adaptive antenna array has shown real promise for substantial capacity enhancement of increasing the coverage range and capacity of base stations by directing beam patterns towards the desired signals and null-patterns towards the interferers in third generation (3G) mobile systems. We propose in this paper a simple method to evaluate the probability of error in DS-CDMA receivers using a beamformer...
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