00001 /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */ 00002 /* 00003 * Copyright (c) 1997 Regents of the University of California. 00004 * All rights reserved. 00005 * 00006 * Redistribution and use in source and binary forms, with or without 00007 * modification, are permitted provided that the following conditions 00008 * are met: 00009 * 1. Redistributions of source code must retain the above copyright 00010 * notice, this list of conditions and the following disclaimer. 00011 * 2. Redistributions in binary form must reproduce the above copyright 00012 * notice, this list of conditions and the following disclaimer in the 00013 * documentation and/or other materials provided with the distribution. 00014 * 3. All advertising materials mentioning features or use of this software 00015 * must display the following acknowledgement: 00016 * This product includes software developed by the Computer Systems 00017 * Engineering Group at Lawrence Berkeley Laboratory. 00018 * 4. Neither the name of the University nor of the Laboratory may be used 00019 * to endorse or promote products derived from this software without 00020 * specific prior written permission. 00021 * 00022 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00023 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00024 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00025 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00026 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00027 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00028 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00029 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00030 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00031 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00032 * SUCH DAMAGE. 00033 */ 00034 /* Ported from CMU/Monarch's code, nov'98 -Padma.*/ 00035 00036 #ifndef __modulation_h__ 00037 #define __modulation_h__ 00038 00039 /* ====================================================================== 00040 Modulation Schemes 00041 00042 Using the receive power and information about the modulation 00043 scheme, amount of forward error correction, etc., this class 00044 computes whether or not a packet was received correctly or with 00045 few enough errors that they can be tolerated. 00046 00047 ====================================================================== */ 00048 00049 class Modulation { 00050 00051 public: 00052 virtual ~Modulation () {} 00053 virtual int BitError(double) = 0; // success reception? 00054 00055 protected: 00056 int Rs; // symbol rate per second 00057 00058 private: 00059 // Probability of 1 bit error 00060 virtual double ProbBitError(double) = 0; 00061 00062 // Probability of n bit errors 00063 virtual double ProbBitError(double, int) = 0; 00064 }; 00065 00066 00067 class BPSK : public Modulation { 00068 00069 public: 00070 BPSK(void); 00071 BPSK(int); 00072 00073 virtual ~BPSK () {} 00074 00075 virtual int BitError(double Pr); 00076 00077 private: 00078 virtual double ProbBitError(double Pr); 00079 virtual double ProbBitError(double Pr, int n); 00080 }; 00081 00082 #endif /* __modulation_h__ */ 00083