Streaming data classification requires that a model be available for classifying stream content while simultaneously detecting and reacting to changes to the underlying process generating the data. Given that only a fraction of the stream is ‘visible’ at any point in time (i.e. some form of window interface) then it is difficult to place any guarantee on a classifier encountering a ‘well mixed’...

Manuscript received December 10, 1999. Manuscript revised March 18, 2000. † The authors are with NTT Network Innovation Laboratories, Yokosuka-shi, 239-0847 Japan. SUMMARY This paper proposes a new digital beamforming adaptive array antenna (DBFAAA) that is effective in severe multipath environments in which timing and carrier synchronization circuits cannot function ideally resulting in the DB...

A new algorithm for the tracking and cancellation of broadband sources in linear arrays employing baseband tapped delay line processing is presented and investigated. Using this technique, each broadband source is individually tracked in a cyclical timemultiplexed manner by steering a broadband null formed from the use of a tapped delay line filter with weights constrained to have maximally fla...

A new algorithm for the tracking and cancellation of broadband sources in linear arrays employing baseband tapped delay line processing is presented and investigated. Using this technique, each broadband source is individually tracked in a cyclical time-multiplexed manner by steering a broadband null formed from the use of a tapped delay line filter with weights constrained to have maximally fl...

The wave union (WU) method is a well-known in time-to-digital converters (TDCs) and can improve TDC performances without consuming extra logic resources. However, an earlier study concluded that the WU not suitable for UltraScale field-programmable gate array (FPGA) devices, due to more severe bubble errors. This article proves otherwise presents new strategies pursue high-resolution TDCs Xilin...

We demonstrate optical Nyquist channel generation based on a comb-based optical tapped-delay-line. The frequency lines of an optical frequency comb are used as the taps of the optical tapped-delay-line to perform a finite-impulse response (FIR) filter function. A single optical nonlinear element is utilized to multiplex the taps and form the Nyquist signal. The tunablity of the approach over th...

We demonstrate a 2-D optical tapped-delay-line that exploits nonlinearities and chromatic dispersion to perform 2-D correlation on 20Gbaud QPSK data with correlator results with an average EVM of ~7.8%. We successfully recognize different 2×2 target patterns in an image with 961 pixels. Introduction Correlators are useful building blocks for various applications, including data decoding and pat...

A maximum a posteriori (MAP) equalizer is derived in this paper by formulating the forward/backward recursion MAP algorithm (i.e. the BCJR algorithm) on a paralleltrellis representation that was previously proposed for equalizing sparse multipath channels. Several enhancements are suggested to further improve the performance and/or reduce the complexity of the resultant MAP equalizer. Results s...

We demonstrate a reconfigurable 2D optical tapped-delay-line (OTDL) to correlate quadrature-phase-shift-keying (QPSK) 20 Gbaud data. By implementing two independent tapped-delay-lines which performs correlation over rows (inner sum), along with a coherent multiplexing of the correlated rows which performs correlation over columns (outer sum), a 2D correlator is achieved with average error vecto...

This paper solves the problem of designing recursive-least-squares (RLS) lattice (or order-recursive) algorithms for adaptive filters that do not involve tapped-delay-line structures. In particular, an RLS–Laguerre lattice filter is obtained.