A system for communicating communications data, said system comprising: a transmitter adapted to transmit said communications data, said transmitter comprising: an encoder adapted to encode said communications data using a forward error correction code; a block interleaver adapted to interleave the encoded communications data and to output interleaved data bits in a serial data stream, a data randomizer adapted to receive said interleaved data bits from the block interleaver and output randomized data processed with a random bit sequence as unknown symbols; a combining circuit adapted to form frames by inserting known symbols into said randomized data; and a modulator adapted to map the formed frames received from the combining circuit into minimum shift keying or Gaussian minimum shift keying, MSK or GMSK, symbols based on a specific mapping algorithm to form a communications signal having a constant amplitude MSK or GMSK waveform over which the communications data are transmitted; and a receiver adapted to receive the communications signal from the transmitter, and including a filter that is matched to a main pulse of the MSK or GMSK waveform and a block or symbol equalizer for equalizing the communications signal, said block or symbol equalizer further comprising a clamping circuit operative for clamping communications data symbols of said communications signal to a real symbol or an imaginary symbol depending on the location of the symbol in a currently processed frame of said communications signal. a transmitter adapted to transmit said communications data, said transmitter comprising: an encoder adapted to encode said communications data using a forward error correction code; a block interleaver adapted to interleave the encoded communications data and to output interleaved data bits in a serial data stream, a data randomizer adapted to receive said interleaved data bits from the block interleaver and output randomized data processed with a random bit sequence as unknown symbols; a combining circuit adapted to form frames by inserting known symbols into said randomized data; and a modulator adapted to map the formed frames received from the combining circuit into minimum shift keying or Gaussian minimum shift keying, MSK or GMSK, symbols based on a specific mapping algorithm to form a communications signal having a constant amplitude MSK or GMSK waveform over which the communications data are transmitted; and a receiver adapted to receive the communications signal from the transmitter, and including a filter that is matched to a main pulse of the MSK or GMSK waveform and a block or symbol equalizer for equalizing the communications signal, said block or symbol equalizer further comprising a clamping circuit operative for clamping communications data symbols of said communications signal to a real symbol or an imaginary symbol depending on the location of the symbol in a currently processed frame of said communications signal. an encoder adapted to encode said communications data using a forward error correction code; a block interleaver adapted to interleave the encoded communications data and to output interleaved data bits in a serial data stream, a data randomizer adapted to receive said interleaved data bits from the block interleaver and output randomized data processed with a random bit sequence as unknown symbols; a combining circuit adapted to form frames by inserting known symbols into said randomized data; and a modulator adapted to map the formed frames received from the combining circuit into minimum shift keying or Gaussian minimum shift keying, MSK or GMSK, symbols based on a specific mapping algorithm to form a communications signal having a constant amplitude MSK or GMSK waveform over which the communications data are transmitted; and a receiver adapted to receive the communications signal from the transmitter, and including a filter that is matched to a main pulse of the MSK or GMSK waveform and a block or symbol equalizer for equalizing the communications signal, said block or symbol equalizer further comprising a clamping circuit operative for clamping communications data symbols of said communications signal to a real symbol or an imaginary symbol depending on the location of the symbol in a currently processed frame of said communications signal.