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This paper presents the design of a TTC-RF (Telemetry, Tracking and Command-RF) system simulator. The simulator is designed on PXI Platform using Labview software with the software defined radio approach. The PXI RF modules used for this purpose is Vector Signal Generator (VSG) and Vector Signal Analyzer (VSA). The simulator is designed to simulate all the RF functionalities of an actual TTC transponder...
Uplink Co-ordinated Multi-Point (UL CoMP) is an important technique to significantly improve user performance, especially in dense small-cell networks. In such networks it is important that co-operation be (a) scalable w.r.t. number of cells (b) adaptable to different inter-connect bandwidths. In this paper, we propose near-optimal distributed mechanisms to enable uplink co-operation. We develop protocols...
In this paper, we consider interference issues arising in HetNets where the small-cells are deployed in closely-spaced clusters. Such dense deployments pose an important challenge for scaling throughput proportional to the number of cells, since inter-cell interference becomes a key bottleneck for achieving high capacity. We examine key design issues around the use of coordinated beamforming (CBF)...
The Quadrature Phase Shift Keying(QPSK) demodulator being presented here is designed based on Modified Costas loop technique to demodulate data rates upto 2 × 200Mbps. This paper highlights the design challenges involved in handling very high data rates in the analog domain with minimum cross-talk between I & Q chains and distortion in the demodulated signal. This paper also discusses about the...
Alternative wireless topologies, e.g., an underlay network of Pico-cells, are increasingly seen as being necessary to enhance capacity and coverage in next generation wireless systems. Such networks of closely-spaced base-sites have to contend with high interference issues, wherein interference mitigation via power control or interference co-ordination may not be sufficient. Capacity can be significantly...
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