This paper presents a field-programmable gate array (FPGA)-based digital down converter (DDC) that can reduce the bandwidth from about 70 MHz to 182.292 kHz. The proposed DDC consists of polyphase COordinate Rotation DIgital Computer (CORDIC) processor and multirate filter. advantage CORDIC is process with high sample rate input data produces computational efficient noiseless baseband spectrum....

A multiple description scalar quantization (MDSQ) based coding system can be regarded as a source coder (quantizer) followed by a channel coder, i.e. the combination of index and codeword assignment. The redundancy, or the correlation between the descriptions, is controlled by the number of diagonals covered by the index assignment. We consider here the usage of multiple description uniform sca...

The multiple inverse method is widely used to invert multiple stress tensors from fault-slip data caused by polyphase tectonics. A practical problem of the method is the time-consuming computation related to its iterative procedure. This paper describes a way of accelerating the computation by replacing an exhaustive grid search for the optimal stress tensor by direct calculation using an analy...

A sub-1V analog front-end for the FM 88-108MHz broadcasting band is presented. This front end includes a LNA, two RF amplifiers, I-Q down converters, on chip active polyphase and low-pass filters. An RSSI and limiting amplifiers are included too. The total current consumption is only 600μA for a global NF of 5dB. This front-end is suitable for FM and further RDS demodulation.

This paper surveys the progress made on pairwise orthogonal wavelet frames and comments on the construction methods. There are a few known constructions based on the unitary extension principle, a paraunitary matrix and a given modulation matrix. A polyphase matrix based construction method has been presented which satisfies the condition of unitary extension principle yielding pairwise orthogo...

In this paper we proposed an efficient structure for sampling rate conversion by rational factor of L/M, where L is upsampling factor and M is downsampling factor. In this method, the coefficient symmetry of the linear phase filter is used. In this way, the number of required multiplications per output sample is reduced. For implementation we use linear phase FIR filter. The symmetric FIR filte...

Different decimation filter architectures are compared for integration with an existing second order sigma-delta modulator to form a sigmadelta ADC. The decimation filters are implemented using a third order cascaded integrator comb filter programmed to work for oversampling ratios of 64, 128 and 256. IIR-FIR, non-recursive and polyphase architectures of decimation filters are simulated and imp...

In this paper we describe a novel wavelet based filtered multitone modulation scheme for transmission over broadband wireless channels. The attractive feature of this scheme is its low implementation complexity compared to known filtered multitone modulation architectures that are based on polyphase synthesis and analysis filter banks. Its feasibility has been demonstrated by a prototype hardwa...

This paper concerns the filter design problem for a recent proposed polyphase filter bank with arbitrary number of subband channels. According to the perfect reconstruction condition for I-D case presented in [ I ] , an analytical formula for the filter design is developed. Compared with direct numerical design algorithms. this analytical formula allows one to design the required low-pass FIR p...