CAJ | 학술논문

在单载波频域均衡系统中，线性均衡算法虽然简单易行，但是其抑制噪声干扰和符号间干扰的能力有限，因此需要引入非线性的反馈和迭代机制以进一步提升系统性能。迭代块判决反馈均衡（Iterative Block Decision Feed-back Equalization ，IBDFE）就是一种行之有效的非线性算法，但其缺点是计算复杂度高。鉴于此，在IBDFE结构的基础上，利用最小均方误差准则，推导出了一种新的简化算法。之后，对简化后算法和现有低复杂度算法的均方误差（Mean Square Error ，MSE）性能进行了理论分析和比较，并在两种无线多径衰落信道下对三种不同的算法进行了仿真。结果表明，在所给信道条件下，这种算法在迭代两次后已基本收敛。同时，仿真也验证了MSE分析的结论。最后，对算法复杂度的分析和比较表明，提出的简化算法相比传统IBDFE算法，其误比特率性能有所下降，但能有效地减小计算量。
재단재파빈역균형계통중，선성균형산법수연간단역행，단시기억제조성간우화부호간간우적능력유한，인차수요인입비선성적반궤화질대궤제이진일보제승계통성능。질대괴판결반궤균형（Iterative Block Decision Feed-back Equalization ，IBDFE）취시일충행지유효적비선성산법，단기결점시계산복잡도고。감우차，재IBDFE결구적기출상，이용최소균방오차준칙，추도출료일충신적간화산법。지후，대간화후산법화현유저복잡도산법적균방오차（Mean Square Error ，MSE）성능진행료이론분석화비교，병재량충무선다경쇠락신도하대삼충불동적산법진행료방진。결과표명，재소급신도조건하，저충산법재질대량차후이기본수렴。동시，방진야험증료MSE분석적결론。최후，대산법복잡도적분석화비교표명，제출적간화산법상비전통IBDFE산법，기오비특솔성능유소하강，단능유효지감소계산량。
In single carrier frequency domain equalization (SC-FDE)systems ,linear equalization is simple and practical ,but it does not do well in noise and inter-symbol interference (ISI )suppression .Therefore ,nonlinear feedback and iteration mechanism is needed to improve the performance .Iterative block decision feedback equalization (IBDFE )is an effective nonlinear algorithm with a disadvantage of high computational complexity .In view of this ,a simplified algorithm is derived on the basis of IBDFE structure us-ing the minimum mean square error (MMSE )criterion .Then the mean square error (MSE )of the simplified algorithm and the existing low complexity algorithm is analyzed and compared .Three algorithms are simulated considering two kinds of wireless multipath fad-ing channels .Results show that the proposed algorithm is convergent after two iterations under the given channels .Simulations also validate the conclusions of MSE analysis .Computational complexity comparison indicates that the proposed algorithm decreases the bit error rate (BER )performance ,but it can efficiently reduce the amount of calculation .