Abstract
Interference coordination methods for Evolved-Multimedia Broadcast/Multicast Service (E-MBMS) in Long-Term Evolution Advanced (LTE-A) are presented. In addition, we consider signal space diversity based on Rotation Matrices (RM) known to provide good performance gains over uncorrelated Rayleigh fading channels. OFDM/OFDMA systems can make the use of RM very attractive both for single and multiple antenna transmissions. In this paper, OFDM/OFDMA signals based on LTE parameters are combined with RM, MIMO, Turbo, or LDPC codes. We have considered different types of receivers, namely, we used an MMSE (Minimum Mean Squared Error) equalizer and a Maximum Likelihood Soft Output criterion (MLSO). Frequency, signal, and space diversity gains are evaluated for different spatial channel models (SCM) based on ITU multipath propagation channels. Different adaptive frequency reuse and schedulers are considered to evaluate the E-MBMS spectral efficiency at the cell borders.
Highlights
Long-Term Evolution Advanced (LTE-A) considers a series of new transmission technologies, such as, coordinated multipoint transmission and reception, relay and carrier aggregation
The results presented will be shown as a function of Eb/N0, where Eb is the average information bit energy and N0 is the single-sided noise power spectral density
In terms of coverage or throughput, the SNR of each block is computed taking into account all the above impairments and based on the comparison between the reference SNR at a BLER of 1% and the evaluated SNR. it is decided whether the block is or not correctly received
Summary
Long-Term Evolution Advanced (LTE-A) considers a series of new transmission technologies, such as, coordinated multipoint transmission and reception, relay and carrier aggregation. Cooperative MIMO techniques can effectively turn intercell interference into useful signals, allowing significant power and diversity gains to be exploited. We consider Orthogonal FrequencyDivision Multiplexing/ Orthogonal Frequency Division Multiple Access (OFDM/OFDMA) where the use of Turbo or LDPC codes in combination with multiple input multiple output (MIMO) and signal space diversity is exploited to achieve several gains in band-limited wireless communication systems. We present Turbo and LDPC codes coupled with signal space diversity provided by Rotation Matrices (RM) both Real RM and Complex RM. Both QPSK and M-QAM modulation schemes in several ITU propagation channels will be evaluated starting with a block uncorrelated Rayleigh fading channel.
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