Maximal Ratio Combining RAKE Receiver Research Articles

The Performance Evaluation of 802. 15. 3a UWB Channel Model with Different Rake Receiver Fingers of Maximal Ratio Combiner Scheme

In this paper we proposed an analytical method which is used for 802.15.3a UWB channel to find out the effect of rake receiver finger with Maximal ratio combining (MRC) scheme. We used a mathematical model which is derived while considering the receiver is MRC rake receiver. In this receiver we assigned weights to rake receiver finger in such a way to maximize the signal to noise ratio (SNR). With the help of maximal ratio combining (MRC) mathematical model we try to evaluate the performance result with different rake receiver finger.

Application of expectation-maximisation algorithm to channel estimation and data detection techniques in ultra-wideband systems

This study applies the expectation-maximisation (EM) algorithm to direct sequence ultra-wideband (DS-UWB) systems, combining channel estimation with data detection in iterative steps. UWB systems often suffer from multipath interference because of obstacles in indoor environments. This study employed a maximal-ratio combining (MRC) Rake receiver for its ability to exploit the gain in multipath diversity provided by multipath propagation when the channel coefficient is estimated correctly. Simulation results demonstrate that the channel coefficient captured by the MRC Rake receiver can be estimated efficiently using the proposed EM algorithm. The proposed system is capable of attaining practical convergence within a few iterations.

Average channel capacity for Rake receivers

The average channel capacity (in the Shannon sense) assigned to each user of a spread spectrum system operating in Rayleigh fading is estimated when optimum operation of a maximal ratio combining Rake receiver is assumed. As is shown, the derived expression fully conforms to the upper bound for the capacity of an ideal non-fading additive white Gaussian noise channel when the transmitted signal bandwidth tends to infinity, i.e. the Shannon limit, proving the validity of the presented analysis.