viii
16.9. ÑAÙNH GIAÙ CHAÁT LÖÔÏNG DUØNG KYÕ THUAÄT SEMIANALYTIC (BAÙN
PHAÂN TÍCH) ........................................................................................................................250
17. MAÕ HOÙA KEÂNH TRUYEÀN ............................................................................ 256
17.1. MAÕ KHOÁI...................................................................................................................256
17.1.1. BIEÅU DIEÃN MOÄT PHAÀN TÖÛ TRONG TRÖÔØNG GALOIS......................257
17.1.2. MAÕ REED-SOLOMON....................................................................................258
17.1.3. MAÕ BCH .............................................................................................................262
17.1.4. MAÕ KHOÁI TUYEÁN TÍNH .................................................................................264
17.2. MAÕ CHAÄP .................................................................................................................269
17.2.1. DAÏNG ÑA THÖÙC CUÛA BOÄ MAÕ HOAÙ CHAÄP.............................................270
17.2.2. DAÏNG CAÁU TRUÙC TRELLIS CUÛA BOÄ MAÕ HOÙA CHAÄP .......................271
17.2.3. MAÕ HOÙA VAØ GIAÛI MAÕ MAÕ CHAÄP................................................................273
18. CAÙC BOÄ CAÂN BAÈNG ................................................................................... 281
18.1. CAÙC BOÄ CAÂN BAÈNG THÍCH NGHI ...................................................................281
18.1.1. BOÄ CAÂN BAÈNG KHOAÛNG CAÙCH KYÙ HIEÄU.............................................281
18.1.2. BOÄ CAÂN BAÈNG ÑÒNH KHOAÛNG TYÛ LEÄ....................................................282
18.1.3. BOÄ CAÂN BAÈNG HOÀI TIEÁP QUYEÁT ÑÒNH .................................................283
18.2. CAÙC GIAÛI THUAÄT CAÂN BAÈNG THÍCH NGHI..................................................284
18.2.1. GIAÛI THUAÄT BÌNH PHÖÔNG TRUNG BÌNH CÖÏC TIEÅU (LMS –
LEAST MEAN SQUARE).............................................................................................284
18.2.2. GIAÛI THUAÄT LMS COÙ DAÁU (SIGN LMS)..................................................285
18.2.3. GIAÛI THUAÄT LMS CHUAÅN HOÙA (NORMALIZED LMS)........................285
18.2.4. GIAÛI THUAÄT LMS COÙ BÖÔÙC NHAÛY THAY ÑOÅI (VARIABLE-STEP-
SIZE LMS) .......................................................................................................................285
18.2.5. GIAÛI THUAÄT BÌNH PHÖÔNG CÖÏC TIEÅU HOÀI QUY (RLS –
RECURSIVE LEAST SQUARE) ................................................................................285
18.2.6. GIAÛI THUAÄT MODULUS HAÈNG SOÁ (CONSTANT MODULUS
ALGORITHM) .................................................................................................................286
18.3. SÖÛ DUÏNG CAÙC BOÄ CAÂN BAÈNG THÍCH NGHI TRONG MATLAB ............286
18.3.1. XAÙC ÑÒNH GIAÛI THUAÄT THÍCH NGHI ......................................................286
18.3.2. XAÂY DÖÏNG ÑOÁI TÖÔÏNG MOÂ TAÛ BOÄ CAÂN BAÈNG THÍCH NGHI .......288
18.3.3. TRUY XUAÁT VAØ HIEÄU CHÆNH CAÙC ÑAËC TÍNH CUÛA BOÄ CAÂN BAÈNG
THÍCH NGHI ...................................................................................................................289
