The problem of blind adaptive channel estimation, in code-division multiple-access (CDMA) systems, is considered. Using only the spreading code of the user of interest and the received data, adaptive techniques are proposed that blindly identify the impulse response of the multipath channel. In particular, we develop RLS and LMS implementations that exhibit rapid convergence combined with low c...

In this paper, an OFDM-CDM (orthogonal frequency division multiplexing code division multiplexing) system with adaptive symbol mapping is presented. This combination enables a robust transmission with flexible error protection and data rate adaptation for parallel data streams by exploiting additional diversity due to CDM. Performance results are presented for fading channels where OFDMCDM with...

Throughput maximization of an adaptive transmission system with a finite number of transmitted power levels and code rates for communication over slow fading channels is analyzed based on the concept of information outage. Properties of throughput maximizing policies lead to an iterative algorithm which suggests good system designs. Numerical results show that carefully designed discrete adapti...

The Morse code is an international communication language that is simple, speedy, and low cost. The automatic recognition of Morse code is difficult because maintaining a stable typing rate is not easy. In this paper, a suitable adaptive automatic recognition method, the variable degree variable step size Least-Mean-Square algorithm, is provided and its procedure is divided into three modules: ...

Throughput maximization of an adaptive transmission system with a finite number of transmitted power levels and code rates for communication over slow fading channels is analyzed based on the concept of information outage. Properties of throughput maximizing policies lead to an iterative algorithm that yields good system designs. Numerical results show that carefully designed discrete adaptive ...

A RAKE receiver accomplishing joint blind multipath diversity combining and PN code timing recovery is proposed for direct-sequence spread-spectrum signaling over a frequency-selective fading channel. In this technique, an improved known modulus adaptive algorithm is exploited to perform multipath diversity combining in the blind mode, while a modified PN code timing recovery technique based on...

Compiling queries to machine code is a very efficient way for executing queries. One often overlooked problem with compilation is the time it takes to generate machine code. Even with fast compilation frameworks like LLVM, generating machine code for complex queries often takes hundreds of milliseconds. Such durations can be a major disadvantage for workloads that execute many complex, but quic...

This paper introduces an application of adaptive filtering in a noise-canceling configuration that detects code delay and multipath in GPS using a simplified GPS signal model. An adaptive filtering process which allows a receiver to accommodate for changes in the environment surrounding the antenna is used. In this algorithm, filter weights from an LMS adaptive noise-canceling algorithm enable ...

Software maintenance involves different categories of activities: corrective, adaptive, perfective, and preventive. However, research regarding these distinct activities is hampered by lack of empirical data that is labeled to identify the type of maintenance being performed. A promising dataset is provided by the more than 800 versions of the Linux kernel that have been released since 1994. Th...

Morse code is now being harnessed for use in rehabilitation applications of augmentative-alternative communication and assistive technology, including mobility, environmental control and adapted worksite access. In this paper, Morse code is selected as a communication adaptive device for disabled persons who suffer from muscle atrophy, cerebral palsy or other severe handicaps. A stable typing r...