–Polyphase filters are becoming a very important component in the design of various filter structures due to the fact that it reduces the cost and complexity of the filter by doing the process of decimation prior to filtering which reduces the multiplications per input sample. In this paper, a review of the basic polyphase filter has been done along with calculation and comparison cost of vario...

The authors present a novel design of a wide bandwidth polyphase up-sampling filter bank formed by cascading external shaping filters, arbitrary interpolators and two stages of polyphase channelisation. The channeliser synthesises 160 channels with 6-MHz frequency centres and thus spans a two-sided baseband bandwidth of 960 MHz. The two stages of channelisation first form super channels from te...

Polyphase sequences are finite, complex, time-discrete sequences with constant magnitude and variable phases. A polyphase sequence with elements of magnitude 1 is called a Barker sequence if the maximum magnitude of all sidelobes of their aperiodic auto-correlation function (ACF) is less or equal to one. Stochastic optimization algorithms have been applied to search for polyphase Barker sequenc...

This paper introduces a polyphase implementation and design of an oversampled K-channel generalized DFT (GDFT) filter bank, which can be employed for subband adaptive filtering, and therefore is required to have a low aliasing level in the subband signals. A polyphase structure is derived which can be factorized into a real valued polyphase network and a GDFT modulation. For the latter, an FFT ...

In this paper, we introduce a polyphase implementation and design of an oversampled K-channel generalized DFT (GDFT) l-ter bank, which can be employed for subband adaptive ltering, and therefore is required to have a low aliasing level in the subband signals. A polyphase structure is derived which can be factorized into a real valued polyphase network and a GDFT modulation. For the latter, an F...

This paper first gave a brief introduction of communication channel models, and then describes the characteristics of the channel emulator. According to the characteristics of the channel model, multipath is a difficult problem for hardware implementation. In order to simplify the hardware, the polyphase filter can be used for multi-path delay. Then the paper reviews the polyphase filter in the...

A channelizer is used to separate users or channels in communication systems. A polyphase channelizer is a type of channelizer that uses polyphase filtering to filter, downsample, and downconvert simultaneously. With graphics processing unit (GPU) technology, we propose a novel GPU-based polyphase channelizer architecture that delivers high throughput. This architecture has advantages of provid...

as a new input data, the summation in (22) can be achieved by using the DIF fast DCT algorithm [6]. It is noted that the multiplication of 2 cos(-) to g (2 j + 1) in (23) depends on the indexes of polyphase filters. Hence, according to (18) and (19), we can merge the factors 2 cos( w) into the corresponding coefficients of polyphase filters, as Fig. 2 shows. Then, we can save those y multiplica...

This paper describes the use of a polyphase filterbank to perform the interpolations required for symbol timing synchronization in a sampled-data receiver. The polyphase filterbank possesses advantages over architectures based on separate matched and interpolation filters. Interpolations are realized by filterbank index selection and a separate interpolating filter following the matched filter ...