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An Adaptive MIMO Transmission Technique for LDPC Coded OFDM Cellular Systems
White Paper In this paper, an adaptive MIMO transmission scheme using QAM and LDPC code is proposed for an OFDM cellular system employing FDD. By approximating the LLR distribution to a Gaussian distribution, only two parameters, the mean and the normalized... [03 Jul 2008]
Aspects of Coding and Modulation for OFDM
White Paper The channel capacity of some ISI channels is examined under the condition that OFDM in conjunction with QAM modulation for subcarriers and the BICM coding scheme is used. Simulations with a turbo coded OFDM system confirm the results. [14 Apr 2007]
Development of an OFDM Based High Speed Wireless LAN Platform Using the TI C6x DSP
White Paper Each standard operates using adaptive sub-band Quadrate Amplitude Modulation (QAM) and offers a maximum data rate of 54 Mbits/s over a 20 MHz channel. Coded Orthogonal Frequency Division Multiplexing (COFDM) is currently specified in all three of... [11 Apr 2007]
Adaptive Modulation Based MC-CDMA Systems for 4G Wireless Consumer Applications
White Paper The digital modulation schemes considered are M-ary QAM, M-ary PSK, M-ary CPM, M-ary MHPM, and GMSK with varying bit-duration-bandwidth product. In this paper, various adaptive modulation based coded MC-CDMA systems have been studied in Rayleigh... [16 Jun 2006]
Performance Degradation of Coded-OFDM Due to Phase Noise
White Paper System performance is evaluated as a degradation of the effective SINR, using BER simulations and in terms of achievable cut-off rate for different M-QAM OFDM schemes in the presence of the phase noise. [02 Nov 2004]
A Low Complexity Space-Frequency BICM MIMO-OFDM System for Next-Generation WLANs
White Paper A MIMO overlay on a 64-QAM OFDM system can increase computational complexity exponentially if Maximum Likelihood performance is desired. This paper proposes a low complexity Space-Frequency Bit Interleaved Coded (SF-BICM) Multiple-Input Multiple... [21 Oct 2004]
