Latency Considerations for Adaptive Modulation in an Interference-free Slow Rayleigh Fading Channel
نویسنده
چکیده
Adaptive modulation exploits the time-variant channel capacity uctuation of fading channels using a range of di erent modem modes according to Equation 1 and Table1. This is achieved at the cost of some latency penalty, which is quanti ed in this treatise and mitigated by frequency hopping.
منابع مشابه
Latency and Networking Aspects of Adaptive Modems over Slow Indoors Rayleigh Fading Channels
Adaptive modulation exploits the time-variant channel capacity fluctuation of fading channels using a range of different modem modes. Specifically, no information is transmitted when the instantaneous channel signal-to-noise ratio (SNR) is low, and, hence, during this period the data must be buffered, which results in delay or latency. When the instantaneous channel quality improves, 2-, 4-, 16...
متن کاملBit Error Performance for Asynchronous Ds Cdma Systems Over Multipath Rayleigh Fading Channels (RESEARCH NOTE)
In recent years, there has been considerable interest in the use of CDMA in mobile communications. Bit error rate is one of the most important parameters in the evaluation of CDMA systems. In this paper, we develop a technique to find an accurate approximation to the probability of bit error for asynchronous direct–sequence code division multiple–access (DS/CDMA) systems by modeling the multipl...
متن کاملJoint Closed-Loop Power Control and Base Station Assignment for DS-CDMA Receiver in Multipath Fading Channel with Adaptive Beamforming Method
In this paper, we propose smart step closed-loop power control (SSPC) algorithm and base station assignment based on minimizing the transmitter power (BSAMTP) technique in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading. This receiver consists of three stages. In the first stage, with conjugate gradient (CG) adaptive ...
متن کاملTracking performance of incremental LMS algorithm over adaptive distributed sensor networks
in this paper we focus on the tracking performance of incremental adaptive LMS algorithm in an adaptive network. For this reason we consider the unknown weight vector to be a time varying sequence. First we analyze the performance of network in tracking a time varying weight vector and then we explain the estimation of Rayleigh fading channel through a random walk model. Closed form relations a...
متن کاملAdaptive Multipath Fading Prediction on Rayleigh Channels
In mobile radio, Rayleigh fading poses the main threat to accurate data transmission. To solve this problem, an adaptive prediction algorithm of the Rayleigh fading channel is investigated here. We implement the adaptive method based on an autoregressive model of the past fading measurements in the sense of LMSE and predict the future fading multiplicative gain ahead. To mitigate the influence ...
متن کامل