2.38.xma.ps

是multiuser detection 这本书的习题解答, 很有用的书.

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1 0 bop 141 -74 a Fg(Problem)35 b(2.38)h(\(Xiao)s(qiang)f(Ma\))141
152 y Ff(Assume)c(that)h(the)g(distance)g(from)f(mobile)f(transmitter)h
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(distance)0 265 y(from)38 b(mobile)g(transmitter)g(to)i(the)f(base)g
(station)g(2)h(is)e Fe(y)s Ff(,)j(whic)m(h)c(are)j(illustrated)d(in)g
(the)i(Figure)g(1.)67 b(And,)0 378 y(assume)43 b(the)g(angle)h(b)s(et)m
(w)m(een)g Fe(B)5 b Ff(1)p Fe(B)g Ff(2)43 b(and)f Fe(B)5
b Ff(1)p Fe(M)54 b Ff(is)42 b Fe(\022)s Ff(,)k(whic)m(h)c(tak)m(es)i(v)
-5 b(alues)43 b(from)g(0)g(to)h(2)p Fe(\031)s Ff(.)80
b(Of)43 b(course)0 491 y Fe(B)5 b Ff(1)p Fe(B)g Ff(2)28
b(=)g(2)p Fe(d)p Ff(.)46 b(The)32 b(p)s(o)m(w)m(er)g(receiv)m(ed)g(b)m
(y)g(the)h(base)f(station)g(2)g(is)g Fe(P)2359 505 y
Fd(1)2398 491 y Ff(,)h(and)e(the)i(transmitted)e(p)s(o)m(w)m(er)h(from)
g(the)0 604 y(mobile)d(is)g Fe(P)442 618 y Fc(m)509 604
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825 y Fe(;)1730 b Ff(\(1\))1707 1045 y Fe(P)38 b Ff(=)1909
983 y Fe(P)1967 997 y Fc(m)p 1909 1024 V 1926 1107 a
Fe(x)1978 1081 y Fd(4)2044 1045 y Fe(:)1715 b Ff(\(2\))0
1251 y(Com)m(bine)29 b(the)i(ab)s(o)m(v)m(e)g(t)m(w)m(o)h(equations,)e
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1486 y Ff(=)25 b Fe(P)1956 1425 y(y)2004 1392 y Fd(4)p
1954 1465 92 4 v 1954 1549 a Fe(x)2006 1522 y Fd(4)2055
1486 y Fe(:)1704 b Ff(\(3\))0 1692 y(No)m(w,)31 b(w)m(e)g(set)g(the)g
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2103 y Ff(+)k(\()p Fe(x)15 b Ff(sin)f Fe(\022)s Ff(\))2431
2066 y Fd(2)2470 2103 y Fe(:)1289 b Ff(\(4\))0 2289 y(Substitute)29
b Fe(y)k Ff(to)e(Eq.\(3\),)h Fe(P)994 2303 y Fd(1)1064
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2543 y Fd(1)1256 2529 y Ff(=)25 b Fe(P)1433 2468 y Ff(\(\(2)p
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(t)f Fe(y)k Ff(as)1238 3491 y Fe(y)1286 3453 y Fd(2)1351
3491 y Ff(=)25 b(\()p Fe(x)15 b Ff(cos)h Fe(\022)23 b
Fb(\000)c Ff(2)p Fe(d)p Ff(\))1969 3453 y Fd(2)2030 3491
y Ff(+)h(\()p Fe(x)15 b Ff(sin)f Fe(\022)s Ff(\))2431
3453 y Fd(2)2470 3491 y Fe(:)1289 b Ff(\(7\))0 3676 y(Substitute)29
b Fe(y)k Ff(in)m(to)d(\(3\),)i Fe(P)932 3690 y Fd(1)1002
3676 y Ff(can)f(b)s(e)f(expressed)f(as)1133 3917 y Fe(P)1191
3931 y Fd(1)1256 3917 y Ff(=)c Fe(P)1433 3855 y Ff(\(\()p
Fe(x)15 b Ff(cos)h Fe(\022)23 b Fb(\000)d Ff(2)p Fe(d)p
Ff(\))1991 3822 y Fd(2)2051 3855 y Ff(+)g(\()p Fe(x)15
b Ff(sin)f Fe(\022)s Ff(\))2452 3822 y Fd(2)2491 3855
y Ff(\))2526 3822 y Fd(2)p 1433 3896 1134 4 v 1954 3979
a Fe(x)2006 3953 y Fd(4)2576 3917 y Fe(:)1183 b Ff(\(8\))0
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4395 y Fe(P)1302 4409 y Fd(1)1367 4395 y Ff(=)e Fe(P)1549
4251 y Fa( )1615 4395 y Ff(1)20 b Fb(\000)1781 4333 y
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1900 4457 a(x)2101 4395 y Ff(+)2202 4333 y(4)p Fe(d)2294
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4431 y Fd(2)2344 4251 y Fa(!)2410 4274 y Fd(2)2465 4395
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b(of)h Fe(x)p Ff(.)141 4758 y(Figure)36 b(2)g(sho)m(ws)g(some)h(curv)m
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Fe(d)p Ff(.)59 b(W)-8 b(e)37 b(can)g(see)f(that)0 4871
y(when)27 b Fe(x)h Ff(go)s(es)h(to)g(in\014nit)m(y)-8
b(,)27 b(the)i(p)s(o)m(w)m(er)f(receiv)m(ed)g(b)m(y)h(base)f(station)g
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4984 y(go)s(es)37 b(\015atter)f(and)f(\015atter.)58 b(On)35
b(the)i(other)f(hand,)g(when)f(the)h Fe(x)g Ff(go)s(es)h(to)f(0,)i(the)
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y(b)s(et)m(w)m(een)c(base)g(station)f(1)h(and)f(2)g(go)s(es)h(larger)f
(and)g(larger.)1927 5364 y(1)p eop
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