Maximal ratio combiner

In channels where the delay spread is smaller than the chip interval (e.g., an IS-95 system operating in indoor environments), spread-spectrum signals do not give rise to path diversity. In this situation, maximal-ratio combiner (MRC) RAKE receivers with resolution reduction (RR) of the diversity receiver branches may be used by the mobile stations to provide diversity gain, significantly improving system

We present a new adaptive implementation of the linear minimum MSE receiver (LMMSER) for asynchronous DS-CDMA. We show that, in the case of multipath propagation, the optimal LMMSER can be decomposed as a bank of filters followed by maximal-ratio combining of the filtered multipath components, as in conventional RAKE receivers. Each filter in the bank can be adapted by a classical “blind” algorithm, based on the constrained minimization of the mean output energy. Then, the combining coefficients can be ...

In this paper, we consider a generalized non-regenerative (amplify and forward) cooperative wireless communication system with L relay nodes. The Rayleigh fading channel is assumed in both broadcasting and relaying stages and maximal ratio combining (MRC) scheme is assumed to be implemented at the receiver side. We evaluate the bit error rate (BER) performance of L-relay nodes cooperative network under

When signals from a user (fixed or mobile) are received at multiple antennas, the signals can be arrayed to increase the signal-to-noise ratio (SNR) of the received signal. This article describes two maximal ratio combining techniques referred to as full spectrum combining (FSC) and complex symbol combining (CSC), and then compares them in terms of the achievable arraying gain. Although

A Monte Carlo simulation was conducted to assess the performance of Multi-Carrier Code Division Multiple Access (MC-CDMA) in a sectored cell, in an indoor environment. In each sector, terminal schedule packet transmission using slotted p-persistent Inhibit Sense Multiple Access, while the packets themselves are transmitted using MC-CDMA. The simulated bit error rate performance of MC-CDMA with combining strategies maximal ratio

... to-interference-plus-noise ratio (SINR) that is required to achieve the same bit error rate (BER), which is ... 7. A comparison between BICM, TCM, TTCM, BICM–ID for 16 QAM techniques with r ... We will study SC and MRC, which represents the two extremes in diversity combining ...

... John Wily & sons. Inc.. New York. 2000 [7] Yao Ma and Teng Joon Lim, "Bit Error Probability for MDPSK and NCFSK over Arbitrary Rician Fading Channels" IEEE Jour. Selected Areas in Communications, Vol. 18. No. 11. pp. 2179-2189. Nov. 2000 [8] Jiayi Wang. ...

The main goal of this paper is to analyze and compare the performance of some space-time codes applied to the forward link of a WCDMA multi-satellite UMTS environment. Space-Time Trellis Codes (STTrC) has been considered as a first comparison with already implemented transmit diversity schemes, as Maximal Ratio Combining (MRC), Space-Time Block Codes (STBC) and Selection Transmit Diversity (STD). Furthermore, in order to improve their performances, Convolutional Codes (CC) have been added as outer encoders to MRC, STBC and STD, while for STTrC, a CC plus an iterative decoding has been considered in order to perform a Space-Time Turbo Coded Modulation (STTuCM). All the aforementioned,schemes have been implemented,for a 2-satellite transmission. An intra and inter-cell interference model is presented in order to evaluate performances,of these schemes,for a loaded system. The effect of a feedback delay and errors in channel state identification have been introduced in order to have a r...

Incremental relaying (IR) was developed to overcome the problems facing regular cooperative relaying methods. Out of the regular methods there is fixed relaying, in which, the relay transmits the source's signal to the destination without considering the state of the channel. On the contrary, adaptive relaying techniques, including IR, are becoming popular among researchers nowadays; since they efficiently utilize the channel. In this paper, we studied the performance of a two-hop IR system that has decode and forward (DF) relays. Moreover, this system was analyzed over Nakagami-m fading channels, with the presence of various interferers positioned near the destination. As a result, the system suffered from co-channel interference. Remarkably, in this work, formulas were driven for the outage probability (OP) and the bit error rate (BER), and the assumptions were checked numerically. Keywords: Cooperative wireless networks Decode-and-forward Incremental relaying Maximal ratio combiner Nakagami-m fading channel Non-identical interferers