This paper investigates various modulation techniques for OFDM including BPSK, QPSK, 8 QAM, 16 QAM, 32 QAM, 64 QAM, 128 QAM, 256 QAM and 512 QAM and system performance is improved with high folds by choosing the modulation technique based on the channel conditions. In this paper, ...
Adaptive Modulation and Coding for LTE Wireless Communication In High-Speed Downlink Packet Access (HSDPA) in Universal Mobile Telecommunications System (UMTS), AMC can be used to choose modulation types and forward error correction (FEC) coding rate. SS Hadi,TC Tiong - 《Iop Conference》 被引量...
自适应调制技术在OFDM系统中的BER性能比较研究表明,随着调制阶数(M)的增加,系统的性能有所提高。当M=4时,系统的SNR与BER之间的关系较为平缓,随着M的增加到16、64和256,系统的SNR要求逐渐降低,对应的BER也随之降低。这表明随着调制阶数的增加,系统能够更有效地利用信道资源,提高数据传输的可靠性和效率。因此,在...
Adaptive modulation with imperfect channel information in OFDM Adaptive modulation in OFDM is a means by which the OFDM transmitter adapts the subchannel bit and power allocation to the amplitude response of the freque... MR Souryal,RL Pickholtz - IEEE 被引量: 180发表: 2001年 Multiuser subcarri...
Input Single-Output (SISO) OFDM system. This is compared with the performance of fixed OFDM transmission where a constant rate is applied to each subcarrier. The second stage applies adaptive modulation to a general MIMO system by making use of the Singular Value Decomposition to separate the...
TECHNOLOGY PERFORMANCE ENHANCEMENT OF IEEE 802.16E (MOBILE WI-MAX) SYSTEM WITH ADAPTIVE MODULATION AND CODING TECHNIQUES WI-MAX is an efficient technology which offers high speed voice, video and data services based on OFDM based adaptive physical layer. WI-MAX is introduced ... Manju R. Agrawal...
PAPR Reduction in SDR-Based OFDM System Orthogonal frequency division multiplexing (OFDM) is a promising new technology as it manages multicarrier modulation. Due to the high spectral bandwidth e... L Chandini,A Rajagopal 被引量: 0发表: 2022年 OFDM Data Telecommunication System Among Vehicles Usi...
OFDMAn adaptive modulation scheme is presented for multiuser orthogonal frequency-division multiplexing systems. The aim of the scheme is to minimize the total transmit power with a constraint on the transmission rate for users, assuming knowledge of the instantaneous channel gains for all users using...
Currently MB OFDMUWB devices operate below the expected performance which is largely due to its EIRP limit and frequency selective fading. This bottle neck can be reduced by implementing adaptive modulation in the system. In this Paper, channel measurement of different scenarios has been carried out...
Orthogonal Frequency Division Multiplexing (OFDM) is high data rate transmission technique. Further, use of space-time block coding (STBC) to the OFDM system may help in combating severe effects of fading. In this paper, adaptive modulation based M-ary QAM,BPSK system applied to STBC based time...