job217.rar_2 1 7编码译码_viterbi_卷积 VHDL_卷积 译码

`include "params.v" module BMG (Reset, Clock2, ACSSegment, Code, Distance); input Reset, Clock2; input [`WD_FSM-1:0] ACSSegment;//6，2的6次方为64，需要进行64次计算 input [`WD_CODE-1:0] Code;//输入比特宽度2 output [`WD_DIST*2*`N_ACS-1:0] Distance; wire [`WD_STATE:0] PolyA, PolyB;//编码器状态9（2，1，9） wire [`WD_STATE:0] wA, wB; assign PolyA = 9'b110_101_111; // polynomial code used assign PolyB = 9'b100_011_101; wire [`WD_STATE:0] B0,B1,B2,B3,B4,B5,B6,B7; // Pay attention to the 9位代表?鼻耙晃患拇嫫髯刺? // WIDTH of B = WD_STATE + 1 wire [`WD_CODE-1:0] G0,G1,G2,G3,G4,G5,G6,G7; // branch output to be 2位各种状态的输出 // calculated wire [`WD_DIST-1:0] D0,D1,D2,D3,D4,D5,D6,D7; // output distances 2位各种状态的汉明距离 reg [`WD_CODE-1:0] CodeRegister;//2位 译码器输入寄存器 always @(posedge Clock2 or negedge Reset) begin if (~Reset) CodeRegister <= 0; else if (ACSSegment == 6'h3F) CodeRegister <= Code; end assign B0 = {ACSSegment,3'b000}; // The branch to be calculated is assign B1 = {ACSSegment,3'b001}; // determined by ACSSegment表示寄存器各种状态 assign B2 = {ACSSegment,3'b010}; assign B3 = {ACSSegment,3'b011}; assign B4 = {ACSSegment,3'b100}; assign B5 = {ACSSegment,3'b101}; assign B6 = {ACSSegment,3'b110}; assign B7 = {ACSSegment,3'b111}; ENC EN0(PolyA,PolyB,B0,G0); assign G1 = ~G0; // Find the 'correct' 根据PA PB（反馈系数）和寄存器的状态确定输出 //的2位编码 G ENC EN2(PolyA,PolyB,B2,G2); assign G3 = ~G2; // branch metric ENC EN4(PolyA,PolyB,B4,G4); assign G5 = ~G4; ENC EN6(PolyA,PolyB,B6,G6); assign G7 = ~G6; HARD_DIST_CALC HD0(CodeRegister,G0,D0); // Calculate its hamming HARD_DIST_CALC HD1(CodeRegister,G1,D1); // distance HARD_DIST_CALC HD2(CodeRegister,G2,D2); HARD_DIST_CALC HD3(CodeRegister,G3,D3); HARD_DIST_CALC HD4(CodeRegister,G4,D4); HARD_DIST_CALC HD5(CodeRegister,G5,D5); HARD_DIST_CALC HD6(CodeRegister,G6,D6); HARD_DIST_CALC HD7(CodeRegister,G7,D7); assign Distance = {D7,D6,D5,D4,D3,D2,D1,D0}; // bus of distances BMG??元输出的每个状态的汉明距离共8位 endmodule /*-----------------------------------*/ module HARD_DIST_CALC (InputSymbol, BranchOutput, OutputDistance); /*-----------------------------------*/ // author : Dian Tresna Nugraha // desc. : performs 2 bits hamming DISTance calculation // delay : N/A /*-----------------------------------*/ input [`WD_CODE-1:0] InputSymbol, BranchOutput;//2位 output [`WD_DIST-1:0] OutputDistance;//2位 reg [`WD_DIST-1:0] OutputDistance;//2位 wire MS, LS; assign MS = (InputSymbol[1] ^ BranchOutput[1]); assign LS = (InputSymbol[0] ^ BranchOutput[0]); always @(MS or LS) begin OutputDistance[1] <= MS & LS; OutputDistance[0] <= MS ^ LS; end endmodule /*-----------------------------------*/ module ENC (PolyA, PolyB, BranchID, EncOut); /*-----------------------------------*/ // author : Dian Tresna Nugraha // desc. : encoder to determine branch output // delay : N/A /*-----------------------------------*/ input [`WD_STATE:0] PolyA,PolyB; input [`WD_STATE:0] BranchID; output [`WD_CODE-1:0] EncOut; wire [`WD_STATE:0] wA, wB; reg [`WD_CODE-1:0] EncOut; assign wA = PolyA & BranchID; assign wB = PolyB & BranchID; always @(wA or wB) begin EncOut[1] = (((wA[0]^wA[1]) ^ (wA[2]^wA[3]))^((wA[4]^wA[5]) ^ (wA[6]^wA[7]))^wA[8]); EncOut[0] = (((wB[0]^wB[1]) ^ (wB[2]^wB[3]))^((wB[4]^wB[5]) ^ (wB[6]^wB[7]))^wB[8]); end endmodule