Query: gmsk

title: 9.2 A 192 Virtual Receiver 77/79GHz GMSK Code Domain MIMO Radar System on Chip
abstract: MIMO radars transmit selected waveforms on N TX physical antennas: when they receive them back on M RX physical antennas, they are able to reconstruct an array with (N x M) virtual receive elements, thereby obtaining a finer spatial/angular resolution. Fully integrated mm wave radar transceivers such as [1 3] implement up to 12 Virtual Receivers (VRX) and can be expanded to larger time domain MIMO arrays only by relying on costly PCB based implementations.

title: LDPC Coded Non Recursive GMSK System with Quasi Coherent Demodulation
abstract: A novel low density parity check (LDPC) coded Gaussian minimum shift keying (GMSK) scheme is proposed for wireless communications subject to low SNRs, limited power and spectrum resources. We first design a non recursive GMSK modulator to alleviate the impact of error propagation. Then, a pilot aided quasi coherent demodulation algorithm (PA QCDA) is derived, where a modified BCJR based detection is used to produce the soft output with initial and ending trellis states being determined using the overhead limited pilot. We choose proper parameters for the non recursive GMSK signaling according to the trade off of the power and spectral efficiency. Simulation results show that the proposed non recursive GMSK system with the PA QCDA can achieve performance similar to the LDPC coded BPSK system and can also work well in the presence of large frequency and phase offsets or burst errors.

title: Algorithm Design Simulation Performance Analysis of MIMO GMSK System for Radio Communication on AWGN Channel
abstract: GMSK (Gaussian Minimum Shift Keying) has become the system whose importance increases as the world getting the age of electronics and associating with cellular technologies. GMSK is the most preferred Modulation format for Mobile communication such as GSM, CDPD, DECT and Digital communications system in the 900Hz to 1800 MHz band. GMSK used for GSM because of its spectral efficiency and for radio power amplifiers it delegates' high efficiency. Power consumption or using the low battery is the crucial factor in cellular technology which can be attained by using a nonlinear amplifier to give a better response. Modulation Scheme becomes an essential factor for better performance of cellular technology. As, ISI degrades the performance of the GMSK system with various types of MIMO. Here in the research article we proposed an approach for reducing the ISI for different m values i.e. 4, 8, 16, 32 and 64 along with the different power i.e. 10dB, 20dB 30dB. As well as GMSK performance is improved by using optimum filter as cost and noise is the major factor we must reduce in our system or different modulation scheme so that we can have better cellular technology. Also we made a comparison for PSK and QAM by computing the probability of BER for different modulating techniques

title: Performance Analysis of GMSK and Chirp Binary Orthogonal Keying in AWGN and Multipath Fading Channels
abstract: Gaussian Minimum Shift Keying (GMSK) is a special form of minimum shift keying, which is one of the most prominent modulation techniques, and has long been used in all the standards of Global System for Mobile Communication (GSM) in the world, since its inception. Later, it has been identified that Chirp signals offer inherent protection against fading in multipath channels. In this work, an investigation has been carried out into the performance of Chirp Binary Orthogonal Keying (C BOK) scheme in AWGN and multipath fading channels. Its performance has also been compared with the GMSK scheme under the same channel conditions. It has been found that C BOK scheme offers better performance in both the AWGN and Multipath fading channels compared to the GMSK scheme. Therefore C BOK may be a good candidate to be used as a modulation technique for wireless and other communication systems with multipath channel environment.

title: Design and analysis of optimized CORDIC based GMSK system on FPGA platform
abstract: The Gaussian minimum shift keying (GMSK) is one of the best suited digital modulation schemes in the global system for mobile communication (GSM) because of its constant envelop and spectral efficiency characteristics. Most of the conventional GMSK approaches failed to balance the digital modulation with efficient usage of spectrum. In this article, the hardware architecture of the optimized CORDIC based GMSK system is designed, which includes GMSK Modulation with the channel and GMSK Demodulation. The modulation consists of non return zero (NRZ) encoder, an integrator followed by Gaussian filtering and frequency modulation (FM) The GMSK demodulation consists of FM demodulator, followed by differentiation and NRZ decoder. The FM Modulation and demodulation use the optimized CORDIC model for an In phase (I) and quadrature (Q) phase generation. The optimized CORDIC is designed by using quadrant mapping and pipelined structure to improve the hardware and computational complexity in GMSK systems. The GMSK system is designed on the Xilinx platform and implemented on Artix 7 and Spartan 3EFPGA. The hardware constraints like area, power, and timing utilization are summarized. The comparison of the optimized CORDIC model with similar CORDIC approaches is tabulated with improvements.

title: Hardware Realization of GMSK System Using Pipelined CORDIC Module on FPGA
abstract: GMSK system is used in many diverse communication systems and which provides compact spectral Bandwidth and high spectral efficiency for next generation communication systems. In this manuscript, the cost effective GMSK system is designed using a Pipelined CORDIC model and realized on the FPGA hardware system. The GMSK system mainly has NRZ Encoder Decoder, Integrator, and differentiator, Gaussian filter, FM modulator and demodulator along with Channel. The FM modulator and demodulator is designed Using a pipelined CORDIC model and Digital Frequency Synthesizer (DFS) The 8 bit Pipelined CORDIC model is used for In phase and Quadrature Phase (IQ) generation along with DFS for arbitrary waveform generation for the formation of IQ modulation. The complete GMSK system is designed using Verilog HDL on Xilinx ISE 14.7 environment and prototyped on FPGA. The GMSK system implementation results are compared with existing approaches with better improvement in hardware constraints like chip area (Slices) and operating frequency.

title: SDR Based Implementation of MSK and GMSK Receiver in Rich Multipath Environment
abstract: This paper presents software defined radio based implementation of Minimum Shift Keying (MSK) and Gaussian Minimum Shift Keying (GMSK) digital receiver. The performance of MSK receiver and GMSK receiver is assessed under practical multipath fading scenario in mode stirred metal enclosure. Metal enclosure when stirred with pedal creates rich isotropic multipath fading environment. The isotropic field and the severity of fading can be reduced by placing radiation absorbent material (RAM) in the metal enclosure. The effect of addition of number of absorbers is to reduce the number of scattered waves hence reduce isotropic field distribution in the enclosure. This effect has direct implication of increased Rician K factor. The performance of MSK and GMSK receiver is analyzed when the metal enclosure was loaded with few pieces of RAM.

title: Performance Realization of CORDIC based GMSK System with FPGA Prototyping
abstract: The Gaussian Minimum Shift Keying (GMSK) modulation is a digital modulation scheme using frequency shift keying with no phase discontinuities, and it provides higher spectral efficiency in radio communication systems. In this article, the cost effective hardware architecture of the GMSK system is designed using pipelined CORDIC and optimized CORDIC models. The GMSK systems mainly consist of the NRZ encoder, Integrator, Gaussian filter followed by FM Modulator using CORDIC models and Digital Frequency Synthesizer (DFS) for IQ Modulation in transmitter section along with channel, the receiver section has FM demodulator, followed by Differentiator and NRZ decoder. TheCORDIC algorithms play a crucial role in GMSK systems for IQ generation and improve the system performance on a single chip. Both the pipelined CORDIC and optimized CORDIC models are designed for 6 stages. The optimized CORDIC model is designed using quadrature mapping method along with pipeline structure. The GMSK systems are implemented on Artix 7 FPGA with FPGA prototyping. The Performance analysis is represented in terms of hardware constraints like area, time and power. These results show that the optimized CORDIC based GMSK system is a better option than the pipelined CORDIC based GMSK systems for real time scenarios.

title: Performance of Smart Grid Dynamic HAN With RQAM and GMSK Modulation
abstract: In smart grid communications, home area network (HAN) plays an important role in managing data transmission among communicating devices through a smart meter. Performance of the network depends on the efficiency of modulation schemes used in the communicating devices such as rectangular quadrature amplitude modulation (RQAM) and Gaussian minimum shift keying (GMSK) Saleh Valenzuela (S V) and Weibull fading channels are appropriate models for indoor communication channels. Average symbol error rate (ASER) and average channel capacity (ACC) performance of indoor dynamic HANs with communicating devices using RQAM and GMSK are analyzed for these channel models. Numerical results are presented to demonstrate the effect of traffic intensity, number of active devices in HAN, and the modulation types with parameters of practical interest.

title: Design of Efficient LDPC Coded Non Recursive CPE Based GMSK System for Space Communications
abstract: We consider a low density parity check (LDPC) coded non recursive Gaussian minimum shift keying (GMSK) scheme for space communications subject to low signal to noise ratio (SNR) limited power, and spectrum resources. First, we design a non recursive continuous phase encoder (NRCPE) based GMSK modulator to alleviate the impact of the error propagation existed in a recursive CPE (RCPE) based one. Then, a corresponding pilot aided quasi coherent demodulation algorithm (PA QCDA) is developed for improving the performance of the non coherent demodulation and the impact of the Doppler shift in the coherent demodulation, whose basic principle is that a modified Bahl, Cocke, Jelinek, and Raviv (BCJR) algorithm based detection performs on the received signals with initial and ending trellis states being determined using the very small pilot overhead. Finally, we choose proper modulation parameters for the NRCPE based GMSK signaling according to the tradeoffs between power and spectral efficiency. The simulation results show that the proposed system using the PA QCDA can achieve excellent performance and can also work well in the presence of the large Doppler shifts and some burst errors.