Conventional RAKE receiver is near-far limited. Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant single-user receivers in direct-sequence code-division multiple-access (DS-CDMA) systems. Depending on the optimization criterion diierent adaptive receivers are obtained. In this paper, a novel adaptive LMMSE-RAKE receiver is presented, which combines con...

This paper describes deconvolution method for estimation of channel impulse response. Radio channels in radio system can be completely described by channel impulse response. We can investigate radio channel type from channel impulse response. In environment between transmitter and receiver there exist two main propragation components, Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS), which are ...

Software defined radio (SDR) technology has been attracted due to its flexibility and efficient performance in mobile communication. This paper presents an efficient scheme of multichannel low-IF receiver that improves digital communication quality in the sense of BER performance and computational cost. Simply adding cosine rolloff filters to the conventional multichannel receiver, the proposed...

Several power control methods in cellular radio systems are reviewed. An adaptive power control scheme based on the adaptive optimization of transmitter power and receiver filter coefficients is analyzed. We implement the power control algorithm, adaptive RAKE receiver and analog RF power amplifier in HP Advanced Design System. We perform the co-simulation in HP Advanced Design System to prove ...

The latest Research Trend in wireless communication is implementing wireless system on SDR (Software Define Radio), so the SDR implementation of MIMO-OFDM receiver with channel state information is presented in this paper. Here we use Xilinx 13.1 Spartan 3 xc3s400pq208 FPGA device. The simulation results are obtained for 2x2 MIMO-OFDM receiver system in which we have implemented channel estimat...

Based on Autler–Townes splitting and AC Stark shifts, we present a Rydberg atom-based receiver for determining the amplitude modulation (AM) frequency among wideband carrier range utilizing cesium atomic vapor cell. To verify this approach, measured signal-to-noise ratio data capacity with 10 kHz AM in from 2 GHz to 18 GHz. Without changing lasers, working band can be easily extended higher by ...

This paper describes a radio-frequency receiver targeting spread-spectrum wireless local-area-network applications in the 2.4-GHz band. Based on a direct-conversion architecture, the receiver employs partial channel selection filtering, dc offset removal, and baseband amplification. Fabricated in a 0.6m CMOS technology, the receiver achieves a noise figure of 8.3 dB, IP3 of 9 dBm, IP 2 of +22 d...

Increased pressure for low power, small form factor, low cost and reduced bill of materials in such radio applications as mobile communications has driven academia and industry to resurrect the direct conversion receiver. Long abandoned in favor of the mature superheterodyne receiver, direct conversion has emerged over the last decade or so thanks to improved semiconductor process technologies ...