نتایج جستجو برای: asynchronous variable processing gain direct sequence
تعداد نتایج: 1647831 فیلتر نتایج به سال:
With the development of aircraft gas turbine engine, a control system should be able to achieve effective thrust gain better operability. The main contribution this paper is develop novel direct approach based on an improved model predictive method through strategy that reduces dimension sequence. It can not only normal tasks but also maximize level within safe operation boundaries. Only action...
SUMMARY We propose a novel asynchronous direct-sequence code-division multiple access (DS-CDMA) using feedback-controlled spreading sequences (FCSSs) (FCSS/DS-CDMA). At the receiver of FCSS/DS-CDMA, the code-orthogonalizing filter (COF) produces a spreading sequence , and the receiver returns the spreading sequence to the transmitter. Then the transmitter uses the spreading sequence as its upda...
The need for algorithms providing synchronization between audio and video data was driven by the advent of multimedia applications in distributed environments. Numerous algorithms have been proposed, but there is a lack in methodologies to assess these algorithms, to compare them, and to determine algorithms best suited for a given networking and end-system environment and application. In this ...
An integrated medium access control framework for a direct sequence code-division multiple access (CDMA) radio access to an asynchronous transfer mode (ATM) network is considered. The system accommodates multimedia services such as voice and data. The inherently high error rate associated with the multipath fading channel is partly overcome by the introduction of a data link control layer emplo...
The action systems framework for modelling parallel programs is used to formally specify a microprocessor. First the microprocessor is specified as a sequential program. The sequential specification is then decomposed and refined into a concurrent program using correctnesspreserving program transformations. Previously this microprocessor has been specified at Caltech, where an asynchronous circ...
The processing that is often employed in receivers for quaternay direct-sequence spread-spectrum communications operates separately on the inphase and quadrature components of the spread-spectrum signal. Recent results on quaternary complex sequences, which are also referred to as four-phase sequences, provide a strong motivation to emplo~ processing methods that permit the receiver to benefit ...
This paper argues that the JPEG coder is based on a non-optimal entropy coding method. It is shown that for frequency domain coders using uniform quantization it is optimal to use entropy coders optimized for the entropy in each frequency component. A subband coder model with uniform quantization followed by optimal entropy coding is presented, where each subband is allocated an entropy coder b...
We consider multirate users in a DS-CDMA system operating in an asynchronous fashion in a multipath environment. Oversampling w.r.t. the chip rate is applied to the cyclostationary received signal and multi-sensor reception is considered, leading to a linear multichannel model. Channels for different users are considered to be FIR and of possibly different lengths, depending upon their processi...
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