Gnu Radio Thesis

Gnu Radio Thesis-44
For example in the 4th Generation cellular standard, networks should support services with transmission rate of 100 mega bit/s for mobile users.In this case MIMO with space-time coding offers a new approach which is robust to channel fading and improves the system capacity.

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Space-time code is applied to multi-antenna channels for both spatial diversity and time diversity.

The data are specifically copied and encoded for multiple transmitting antennas to include more details, while at the receive side, the signals are independently received by each receiving antennas but jointly decoded to overcome transmission errors.The experiment results show that the performance of the system depends on the distance between transmitter and receiver as signals are fading rapidly during the transmission.When the receiver is moved far away from the transmitter, less power will be received.Learn More Modern electronic warfare, SIGINT, and radar systems capture, process, and record wide signal bandwidths at a broad range of frequencies.Engineers need flexible hardware, software, and instrumentation to adapt these systems to new signal types and threats.Finally, possible improvements to the design are discussed and future opportunities explored.With increasing high-data-rate requirements for communication services, multi-antenna MIMO technology has grown as an advanced and effective approach featuring for its high bandwidth-efficiency and high date rate transmission.GNU Radio series software is carried on Linux-based Ubuntu operating system and the hardware in this implementation is USRP2 with RFX 2400 daughter board and VERT 2450 antennas.The performance of the implementation is evaluated by measuring bit error rate and bandwidth of multiple channel impulse response with various configurations such as topology of transceivers, transmitting power and data frame structure.Several new blocks, such as Alamouti source block and Alamouti receiver block, are developed and added into GNU Radio library to realize implement functionality.Second, we designed a customized data frame structure with special pilot signal for the system to acquire channel state information.

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