Digital automatic gain control for software radio W-CDMA base stations

Kim, Chonghoon; Im, Sungbin

doi:10.1049/el:20030180

Cited by 15 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reference [23] proposed a fast and robust scheme using an upcounter and an attenuator. A two-stage AGC algorithm for accurate gain adjustment was proposed in Reference [24], and Reference [25] proposed a new AGC method in which a simple digital algorithm-based implementation was successfully demonstrated without performance loss. More recently, Reference [26] proposed an all-digital AGC architecture without filter and divider.…”

Section: Digital Automatic Gain Controller (Agc)mentioning

confidence: 99%

Efficient Implementation of Multichannel FM and T-DMB Repeater in FPGA with Automatic Gain Controller

Han

Kim

2019

Electronics

View full text Add to dashboard Cite

In this study, we implemented a high-performance multichannel repeater, both for FM and T-Digital Multimedia Broadcasting (DMB) signals using a Field Programmable Gate Array (FPGA). In a system for providing services using wireless communication, a radio-shaded area is inevitably generated due to various obstacles. Thus, an electronic device that receives weak or low-level signals and retransmits them at a higher level is crucial. In addition, parallel implementation of digital filters and gain controllers is necessary for a multichannel repeater. When power level is too low or too high, the repeater is required to compensate the power level and ensure a stable signal. However, analog- and software-based repeaters are expensive and they are difficult to install. They also cannot effectively process multichannel in parallel. The proposed system exploits various digital signal-processing algorithms, which include modulation, demodulation, Cascaded Integrator Comb (CIC) filters, Finite Impulse Response (FIR) filters, Interpolated Second Ordered Polynomials (ISOP) filters, and Automatic Gain Controllers (AGCs). The newly proposed AGC is more efficient than others in terms of computation amount and throughput. The designed digital circuit was implemented by using Verilog HDL, and tested using a Xilinx Kintex 7 device. As a result, the proposed repeater can simultaneously handle 40 FM channels and 6 DMB channels in parallel. Output power level is also always maintained by the AGC.

show abstract

Section: Digital Automatic Gain Controller (Agc)mentioning

confidence: 99%

Efficient Implementation of Multichannel FM and T-DMB Repeater in FPGA with Automatic Gain Controller

Han

Kim

2019

Electronics

View full text Add to dashboard Cite

show abstract

“…The numerical simulation in Section 5 tells us that a condition has to be satisfied in order that the steady-state solution in (8) does not fluctuate radically for AWGN, that is, the variable gain of the digital AGC does not change abruptly because of the feedback from the level detector. The condition is stated as…”

Section: Convergence Of Digital Automatic Gain Controlmentioning

confidence: 99%

“…Theoretical researches were done for the analog AGC (e.g., [2,3]). The rapid development of ASICs and FPGAs has enabled the implementation of AGCs in the digital domain; hence, much of researches have been undertaken for the digital AGC (e.g., [4][5][6][7][8]). Design and performance analysis of a digital AGC were covered in [4] and [5], but the AGC they dealt with contained an exponential variable gain that is of difficulty for digital implementation; the work in [6] eased the burden by placing the exponential function in analog domain.…”

Section: Introductionmentioning

confidence: 99%

“…Design and performance analysis of a digital AGC were covered in [4] and [5], but the AGC they dealt with contained an exponential variable gain that is of difficulty for digital implementation; the work in [6] eased the burden by placing the exponential function in analog domain. AGC that feeds back according to estimated output amplitude and power was discussed in [7] and [8], respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Convergence and stability analysis of a digital automatic gain control

Zhang

Wang

Xiong

2013

Adaptive Control & Signal

View full text Add to dashboard Cite

This paper is dedicated to the theoretical analysis of a digital automatic gain control (AGC), which feedbacks according to the desired output direct current (DC). First, we mathematically model the AGC, with the input signal interfered by AWGN. As it turns out, the loop model is a first-order varying-coefficient stochastic difference equation, and its solution consists of two parts, that is, the transient state and the steady state, which respectively explain the convergence and stability of the AGC. As is shown in the paper, the properties of convergence and stability of AGC are mutually contradictory, and both are determined by a key parameter in the loop, and the parameter is defined as the feedback sensitivity of the loop. The results of the paper are validated by numerical simulation, and they are of theoretical guide for practical digital AGC implementation on Application Specific Integrated Chips (ASICs) or Field Programmable Gate Arrays (FPGAs). Copyright

show abstract

“…Investigation on AGC for mobile communication systems have been carried out in [1]- [4]. There are two major AGC architectures commonly used, feed-forward (FF) and feedbackward (FB) AGC architecture.…”

Section: Introductionmentioning

confidence: 99%

Dual-Rate Automatic Gain Controller for WCDMA Mobile Receiver

Ridwan

2007

2007 IEEE Wireless Communications and Networking Conference

View full text Add to dashboard Cite

High fluctuation of signal level potentially degrades the signal reception quality of receivers in a mobile communication system. An Automatic Gain Controller (AGC) acts to trace such unpredictable received signal variation in a timely manner so that the signal relatively remains at a desired level. In such condition, an ordinary AGC with single-rate accumulator does not improve the system performance; even worsen it at high noise power. This paper proposes a dual-rate AGC, where there are two different rates of sample accumulation, as a solution to improve the signal reception performance in such conditions. Results show that the dual-rate AGC significantly improves both the BER performance and the power level stability at the receiver. The AGC architecture is investigated through simulations in 3GPP WCDMA system.

show abstract

Digital automatic gain control for software radio W-CDMA base stations

Cited by 15 publications

References 2 publications

Efficient Implementation of Multichannel FM and T-DMB Repeater in FPGA with Automatic Gain Controller

Efficient Implementation of Multichannel FM and T-DMB Repeater in FPGA with Automatic Gain Controller

Convergence and stability analysis of a digital automatic gain control

Dual-Rate Automatic Gain Controller for WCDMA Mobile Receiver

Contact Info

Product

Resources

About