With the exponential increase in cellphone internet traffic consumed by new generations of wireless devices, cellular networks face a critical challenge to meet this vast demand of network capacity. As well, the demand for higher data rates and the ever-increasing number of wireless devices led to rapid increase in power consumption and cost of operation of cellular networks. One potential solution to address these issues is to overlay small cell access points with macro cell base stations (BS) as a mean to provide higher network capacity and better network coverage. The major problem, which met the small cells densification, is the strong interference power from the adjacent macro cells. Hence, this paper proposes a new space-time block code, which can be used by outdoor small cell BSs. The small cells are equipped with two antennas and transmit three symbols via three time slots. The new code can cancel the overall interference that affects the small cell data transmission. The proposed code will increase the data rate of the overall network without sharing overhead data between the macro cells and the small cells, permitting the network backhaul to be free for data transmission only.
A rapid increase in the wireless internet-based applications led to an enormous increase in wireless data rates. Intensification of future wireless networks faces a great challenge to meet such growing demand for payload data. A suggested solution that can be used to resolve this issue is to overlay small cell networks with macro cell networks to provide higher network capacity and better coverage. Small cell networks experience large interference from macro cell base stations (BSs) making data rates received by the small cell users not reliably. In this paper, an antenna selection scheme based on small cell user’s (SCU) channel gain is proposed. Whereas, the two tiers use the same network bandwidth resources; the macro BS selects a subset of antennas which has a minimum interfering effect to the SCU based on a pilot sent from SCU to macro cell. The proposed selection scheme has been compared with convex optimization antenna selection scheme. Simulation results show that the SCU data rates are significantly improved using proposed scheme. Execution time required for antenna selection is reduced significantly using the proposed scheme.
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