1 2 f(x)=c+cx+cx2+^+cxrc{0,1}012ri……ai-1Cr-1C0r2加法器r2(3)位移相加特性：一個(gè)m序列與其經(jīng)任意次遲延移位產(chǎn)生的另一個(gè)不同序列模213 列時(shí)，這種取樣被稱為本征取樣。根據(jù)參考文獻(xiàn)《CrosscorrelationPropertiesofdSequencesmqu由上面的式子可以看出，對(duì)17個(gè)奇數(shù)進(jìn)行抽取共抽取5個(gè)m序列，分別為4 5 x互反多項(xiàng)式g(x)。1223623 233多項(xiàng)式系數(shù)(升冪排列多項(xiàng)式系數(shù)(升冪排列)f(x)=1+x+x61f(x)=1+x+x2+x5+x62f(x)=1+x2+x3+x5+x63f(x)=1+x+x3+x4+x64f(x)=1+x+x4+x5+x65f(x)=1+x5+x66序號(hào)11ai2ai4ai6ai3ai5ai1f(x)=1+x+x2+x5+x6aai4ai2ai6ai3ai5ai1aaaaai3ai5a75 54aaai3ai4ai5aaaaaaai5af(x)=1+x5+x6aai4ai2ai6aaa8 值互相關(guān)函數(shù))R(τ)小于要求的特定值。i1iabmaxr為奇數(shù)r12iiuuuuu(1)(1)(2)(3)(4)(5)(6)(7)(8)(9)u[23]u[5]u[13]u[31]u[11]u[23]u[13]u[31]u[23]u[31](1)m序列的自相關(guān)函數(shù)為：9 Ni=1ii+T|l-NNii+Ti0050100150000005010015000000501001500005004060801001201400 0050100150000501001500005010015000050100150000-10050100150000-100501001500u00-10050100150000-100501001500相關(guān)特性不理想，使系統(tǒng)內(nèi)的碼分多址影響增大，所以我們需要找到一種互相關(guān)性能比 G=2r+1r000204060801001201400 004060801001201400002040608010012014050020406080100 500500500204060801001200d 特征相位的定義：每一個(gè)最大長(zhǎng)度序列都具有特征相位，當(dāng)序列處于特征相位時(shí)，序列每隔一位抽樣與原序列一樣，這就是序列處于特征相位的特性。bmaiii(d[xf(x)]ga(x)=〈|f(adxx)+d[xf(x)]a但不是4的倍數(shù)ladx(2)根據(jù)下式求特征相位，使序列{a}處于特征相位上。iiiiiiiii2r-3-2(r-4)/2r+2(r-4)/22r-12r-1-2r/2123平衡 uiv[-1,-s(n),s(n)-2],其中s(n)=2r/2+1。00000501005000501000000050100500050100 00500005000050100150000864200300864200204060801001201400 kasami序列1與序列4的互相關(guān)50-1001001500kasami序列6與序列7的互相關(guān)50-1001001500kasami序列1與序列7的互相關(guān)50-1001001500kasami序列2與序列8的互相關(guān)50-1001001500m(1)m序列具有尖銳的自相關(guān)特性，且為二值自相關(guān)，自相關(guān)也具有周期性；但是序列一樣，為三值相關(guān)，其最大的相關(guān)值不會(huì)超過優(yōu)選對(duì)序列間的最大互相關(guān)值。上述m序列自相關(guān)Gold列自相關(guān)010020406080100120140050-10-150204060801001200 面：因?yàn)楸緦?shí)驗(yàn)有部分內(nèi)容是課本上沒有講述的，主要是m序列抽取盒等。在這次實(shí)驗(yàn)中我都有深刻的體會(huì)。 Am序列優(yōu)選對(duì)矩陣110100110011001100100101010000101010010101010010101010010010101101100000000000000000000000000000000000000000 00000000000000000000001100000101000111110100001001001101011111010110010010110010100011101011101111111101110100110101001011000001000100000110100111111111010111000001001010001111001101110011101011100010100111101011001101011000101011000010100111100100111101000000000000000000000000000000000000000000011100011001010011000110101100010001100101101010110101001010010101001101101100101111101000100110000010110010010010010001111101110010101100010001101011011111110111100110000010001100000000000000000000000000000000000001100100100111010000111100001110000010011011010000110001101011001010010000101101011110111001110111100100000 main()%**************************m序列生成及抽取*******************************%m*%%*************************************************************************% %*****************************Kasami序列***************************% i%********m序列、Gold序列，Kasami序列自相關(guān)和互相關(guān)對(duì)比