Low complexity sphere decoding algorithm in LTE system
Zhenyu Wang · Journal of Computer Applications · 2012
The sphere decoding algorithm has the optimal Bit Error Ratio(BER) performance that approximates to Maxmun Liklihood(ML) in Long Term Evolution(LTE) system.Concerning the computational complexity and required hardware resources of this algorithm increase significantly for detection of 16-QAM and 64-QAM modulated signal streams,an improved sphere decoding algorithm,which changed symbol search strategy,was proposed.A given symbol search scheme at different detection layer,and combined with a new definition for sphere radius of dynamic modifications was adopted in this algorithm.Both of the traditional and improved algorithms were simulated on the condition of Rayleigh fading channel.The simulation results show that the improved algorithm has a small BER degradation,and it also effectively reduces both computational complexity and required hardware resources compared to the traditional sphere decoding algorithm.