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An efficient architecture for implementing the filter in FPGA is presented.
In this article, an efficient way of implementing the FIR filter with CSD coefficients is proposed which reduces the number of adders/subtractors compared to the convectional way of implementing the filter with CSD coefficients.
According to the MSE results in Figures 6 and 7, transmitting the factor α k Γ k brings, in the worst case, 0.2 dB of degradation and from the results of Figure 9 the correlation matrix of the equivalent channel has negligible values out of the diagonal elements and therefore there is no need to increase the system complexity by implementing the filter given by (14).
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As a consequence, Virgin Media estimates that since the launch of Web Safe in February 2014, only about 35% of new customers had been presented with an unavoidable choice about implementing the filtering service".
Implementing the filtering mechanism at the messaging server and/or the cloud controller adds an extra complexity to these components.
Implementing the filtering mechanism in the carrot/amqplib wrapper of OpenStack has advantages of both methods, and avoids unnecessary complexity.
This implementation relies on the 2N-point FFT based receiver presented in Section 2. The transmitter is however replaced by an equivalent scheme implementing the filtering operations in the frequency domain and using smaller IFFT's to generate the signal.
Due to time constraints, we did not implement the filter.
To increase speed of execution, we implemented the filter in fixed point notation.
The top level module implements the filter with seven delay line lengths from 200 samples down to 40 samples, equally spaced.
The methodology has been applied to implement the filter bank CDF9/7 which constitutes a one dimensional (1D) and one level discrete wavelet transform (DWT).
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