Multicarrier personal access communication system

A method for detecting a stream of incoming complex symbols conveyed by a radio frequency signal at a given carrier frequency over a wireless channel to produce an outgoing set of bits, the incoming complex symbols including cyclic prefix symbols to suppress channel interference, the method comprising the steps of

• processing the radio frequency signal to produce a received signal,
• recovering carrier frequency synchronization information and recovering complex symbol timing information from the received signal,
• processing the received signal using the recovered carrier frequency synchronization information to produce a recovered signal,
• sampling the recovered signal using the recovered timing information to produce a stream of sampled complex symbols,
• removing the cyclic prefix symbols from the sampled complex symbols to produce a reduced set of complex symbols,
• computing the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols, and
• demodulating the detected complex symbols to generate the outgoing set of bits.

A method for detecting a stream of incoming complex symbols conveyed by a radio frequency signal at a given carrier frequency over a wireless channel to produce an outgoing set of bits, the incoming complex symbols including cyclic prefix symbols to suppress channel interference, pilot symbols for carrier synchronization and PAR symbols for energy-adjustment, the method comprising the steps of

• recovering carrier frequency synchronization information and recovering complex symbol timing information from the radio frequency signal,
• processing the radio frequency signal using the recovered carrier frequency synchronization and the recovered timing information to produce a stream of recovered complex symbols,
• removing the cyclic prefix symbols from the recovered complex symbols to produce a reduced set of complex symbols,
• computing the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols,
• removing the pilot symbols and PAR symbols from the set of detected complex symbols, and
• demodulating the detected complex symbols to generate the outgoing set of bits.

A method for detecting a stream of incoming complex symbols conveyed by a radio frequency signal at a given carrier frequency over a wireless channel to produce an outgoing set of bits, the incoming complex symbols including cyclic prefix symbols to suppress channel interference, the method comprising the steps of

• receiving the radio frequency signal on a plurality of parallel paths, the step of receiving for each of the paths including the steps of
• recovering carrier frequency synchronization information and recovering complex symbol timing information from the radio frequency signal,
• processing the radio frequency signal using the recovered carrier frequency synchronization and the recovered timing information to produce a stream of recovered complex symbols,
• removing the cyclic prefix symbols from the recovered complex symbols to produce a reduced set of complex symbols,
• computing the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols, and
• computing an estimator indicative of the quality of the set of detected complex symbols,
• selecting the detected complex symbols from one of the paths based upon its corresponding estimator, and
• demodulating the selected detected complex symbols to generate the outgoing set of bits.

A method for detecting a stream of incoming complex symbols conveyed by a radio frequency signal at a given carrier frequency over a wireless channel to produce an outgoing set of bits, the incoming complex symbols including cyclic prefix symbols to suppress channel interference, pilot symbols for carrier recovery, and PAR for energy adjustment, the method comprising the steps of

• receiving the radio frequency signal on a plurality of parallel paths, the step of receiving for each of the paths including the steps
• recovering carrier frequency synchronization information and recovering complex symbol timing information from the radio frequency signal,
• processing the radio frequency signal using the recovered carrier frequency synchronization and the recovered timing information to produce a stream of recovered complex symbols,
• removing the cyclic prefix symbols from the recovered complex symbols to produce a reduced set of complex symbols,
• computing the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols,
• computing an estimator indicative of the quality of the set of detected complex symbols, and
• removing the pilot symbols and PAR symbols from the set of detected complex symbols,
• selecting the detected complex symbols from one of the paths based upon its corresponding estimator, and
• demodulating the selected detected complex symbols to generate the outgoing set of bits.

A method for detecting a stream of incoming complex symbols conveyed by a radio frequency signal at a given carrier frequency over a wireless channel to produce an outgoing set of bits, the incoming complex symbols including cyclic prefix symbols to suppress channel interference, the method comprising the steps of

• receiving the radio frequency signal on a plurality of parallel paths, the step of receiving for each of the paths including the steps of
• recovering carrier frequency synchronization information and recovering complex symbol timing information from the radio frequency signal,
• processing the radio frequency signal using the recovered carrier frequency synchronization and the recovered timing information to produce a stream of recovered complex symbols,
• removing the cyclic prefix symbols from the recovered complex symbols to produce a reduced set of complex symbols,
• computing the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols, and computing an estimator indicative of the quality of the set of detected complex symbols,
• combining the detected complex symbols from the paths to determine selected detected complex symbols based upon each corresponding estimator from each of the paths, and
• demodulating the selected detected complex symbols to generate the outgoing set of bits.

A method for detecting a stream of incoming complex symbols conveyed by a time-division multiple-access frame propagated over a wireless channel to produce an outgoing stream of bits, the time-division multiple-access frame being generated by:

• (a) converting a sequence of input bits into a corresponding set of input symbols wherein each of the input symbols represents a unique plurality of the input bits;
• (b) partitioning the time-division multiple-access frame into a plurality of slots each having a prescribed bandwidth and assigning one of the slots to the sequence of input bits;
• and (c) subdividing the prescribed bandwidth of the assigned slot into a plurality of orthogonal frequency division multiplexed (ODFM) subchannels each conveying a corresponding one of the incoming complex symbols, the method comprising the steps of
• processing the incoming stream of complex symbols to produce a corresponding set of input symbols each representing a unique one of the incoming complex symbols and being conveyed by a corresponding one of the ODFM channels,
• transforming the OFDM channels to generate a set of transformed complex symbols from the incoming complex symbols, and
• processing the transformed complex symbols to generate the stream of outgoing bits.

A system for detecting a stream of incoming complex symbols conveyed by a radio frequency signal at a given carrier frequency over a wireless channel to produce an outgoing set of bits, the incoming complex symbols including cyclic prefix symbols to suppress channel interference, the system comprising

• a recovery circuit for recovering carrier frequency synchronization information and for recovering complex symbol timing information from the radio frequency signal,
• a processor for processing the radio frequency signal using the recovered carrier frequency synchronization and the recovered timing information to produce a stream of recovered complex symbols,
• a prefix remover for removing the cyclic prefix symbols from the recovered complex symbols to produce a reduced set of complex symbols,
• a transform processor for computing the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols, and
• a demodulator for demodulating the detected complex symbols to generate the outgoing set of bits.

A system for detecting a stream of incoming complex symbols conveyed by a time multiple-access frame propagated over a wireless channel to produce an outgoing stream of bits, the time-division multiple-access frame being generated by:

• (a) converting a sequence of input bits into a corresponding set of input symbols wherein each of the input symbols represents a unique plurality of the input bits;
• (b) partitioning the time-division multiple-access frame into a plurality of slots each having a prescribed bandwidth and assigning one of the slots to the sequence of input bits;
• and (c) subdividing the prescribed bandwidth of the assigned slot into a plurality of orthogonal frequency division multiplexed (ODFM) subchannels each conveying a corresponding one of the incoming complex symbols, the method comprising the steps of
• a processor for processing the incoming stream of complex symbols to produce a corresponding set of input symbols each representing a unique one of the incoming complex symbols and being conveyed by a corresponding one of the ODFM channels,
• a transform processor for transforming the OFDM channels to generate a set of transformed complex symbols from the incoming complex symbols, and a generator for processing the transformed complex symbols to generate the outgoing set of bits.