An efficient Hardware implementation of the Peak Cancellation Crest Factor Reduction Algorithm
Abstract: An important component of the cost of a radio base station comes from to the Power Amplifier driving the array of antennas. The cost can be split in Capital and Operational expenditure, due to the high design and realization costs and low energy efficiency of the Power Amplifier respectively. Both these cost components are related to the Crest Factor of the input signal. In order to reduce both costs, it would be possible to lower the average power level of the transmitting signal, whereas in order to obtain a more efficient transmission, a more energized signal would allow the receiver to better distinguish the message from the noise and interferences. These opposed needs motivate the research and development of solutions aiming at reducing the excursion of the signal without the need of sacrificing its average power level. One of the algorithms addressing this problem is the Peak Cancellation Crest Factor Reduction. This work documents the design of a hardware implementation of such method, targeting a possible future ASIC for Ericsson AB. SystemVerilog is the Hardware Description Language used for both the design and the verification of the project, together with a MATLAB model used for both exploring some design choices and to validate the design against the output of the simulation. The two main goals of the design have been the efficient hardware exploitation, aiming to a smaller area footprint on the integrated circuit, and the adoption of some innovative design solutions in the controlling part of the design, for example the managing of the cancelling pulse coefficients and the use of a time-division multiplexing strategy to further save area on the chip. For the contexts where both the solutions could compete, the proposed one shows better results in terms of area and delay compared to the current methods in use at Ericsson and also provides innovative suggestions and ideas for further improvements.
AT THIS PAGE YOU CAN DOWNLOAD THE WHOLE ESSAY. (follow the link to the next page)