modulation.cc
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- /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
- /*
- * Copyright (c) 1997 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the Computer Systems
- * Engineering Group at Lawrence Berkeley Laboratory.
- * 4. Neither the name of the University nor of the Laboratory may be used
- * to endorse or promote products derived from this software without
- * specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /* Ported from CMU/Monarch's code, nov'98 -Padma.*/
- #include <math.h>
- #include <stdlib.h>
- #include <random.h>
- //#include <debug.h>
- #include <modulation.h>
- /* ======================================================================
- Binary Phase Shift Keying
- ====================================================================== */
- BPSK::BPSK()
- {
- Rs = 0;
- }
- BPSK::BPSK(int S)
- {
- Rs = S;
- }
- int
- BPSK::BitError(double Pr)
- {
- double Pe; // probability of error
- double x;
- int nbit = 0; // number of bit errors tolerated
- if(nbit == 0) {
- Pe = ProbBitError(Pr);
- }
- else {
- Pe = ProbBitError(Pr, nbit);
- }
- // quick check
- if(Pe == 0.0)
- return 0; // no bit errors
- // scale the error probabilty
- Pe *= 1e3;
- x = (double)(((int)Random::uniform()) % 1000);
- if(x < Pe)
- return 1; // bit error
- else
- return 0; // no bit errors
- }
- double
- BPSK::ProbBitError(double)
- {
- double Pe = 0.0;
- return Pe;
- }
- double
- BPSK::ProbBitError(double, int)
- {
- double Pe = 0.0;
- return Pe;
- }