High efficiency high performance communications system employing multi-carrier modulation
First Claim
1. A transmitter unit in a communications system configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals, comprising:
- a system data processor operative to receive and partition an input data stream into a plurality of channel data streams and to process the plurality of channel data streams to generate one or more modulation symbol vector streams, wherein each modulation symbol vector stream comprises a sequence of modulation symbol vectors representative of the data in one or more channel data streams, and wherein each modulation symbol vector comprises a plurality of modulation symbols and is generated and transmitted in a manner to provide antenna, frequency, or temporal diversity, or a combination thereof;
at least one modulator coupled to the system data processor, the at least one modulator operative to receive and modulate a respective modulation symbol vector stream to provide a modulated signal; and
at least one antenna coupled to the at least one modulator, the at least one antenna operative to receive and transmit a respective modulated signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Transmitter and receiver units for use in a communications system and configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals. The transmitter unit includes a system data processor, one or more modulators, and one or more antennas. The system data processor receives and partitions an input data stream into a number of channel data streams and further processes the channel data streams to generate one or more modulation symbol vector streams. Each modulation symbol vector stream includes a sequence of modulation symbol vectors representative of data in one or more channel data streams. Each modulator receives and modulates a respective modulation symbol vector stream to provide an RF modulated signal, and each antenna receives and transmits a respective RF modulated signal. Each modulator may include an inverse (fast) Fourier transform (IFFT) and a cyclic prefix generator. The IFFT generates time-domain representations of the modulation symbol vectors, and the cyclic prefix generator repeats a portion of the time-domain representation of each modulation symbol vector. The channel data streams are modulated using multi-carrier modulation, e.g., OFDM modulation. Time division multiplexing (TDM) may also be used to increase flexibility.
-
Citations
44 Claims
-
1. A transmitter unit in a communications system configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals, comprising:
-
a system data processor operative to receive and partition an input data stream into a plurality of channel data streams and to process the plurality of channel data streams to generate one or more modulation symbol vector streams, wherein each modulation symbol vector stream comprises a sequence of modulation symbol vectors representative of the data in one or more channel data streams, and wherein each modulation symbol vector comprises a plurality of modulation symbols and is generated and transmitted in a manner to provide antenna, frequency, or temporal diversity, or a combination thereof;
at least one modulator coupled to the system data processor, the at least one modulator operative to receive and modulate a respective modulation symbol vector stream to provide a modulated signal; and
at least one antenna coupled to the at least one modulator, the at least one antenna operative to receive and transmit a respective modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A communications system configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals, comprising:
-
a system data processor operative to receive and partition an input data stream into a plurality of channel data streams and to encode and modulate the plurality of channel data streams using orthogonal frequency division multiplexing (OFDM) modulation to generate one or more OFDM symbol streams, wherein each OFDM symbol stream comprises a sequence of OFDM symbols representative of data from one or more channel data streams, and wherein each OFDM symbols occupies one time slot and is selected and subsequently transmitted in a manner to provide antenna, frequency, or temporal diversity, or a combination thereof;
at least one modulator coupled to the data processor, each modulator operative to receive and modulate a respective OFDM symbol stream to provide a modulated signal; and
at least one antenna coupled to the at least one modulator, each antenna operative to receive and transmit a respective modulated signal. - View Dependent Claims (35, 36, 37, 38)
-
-
34. A receiver unit comprising:
-
at least one antenna, each antenna operative to receive at least one modulated signal;
at least one front end processor coupled to the at least one antenna, each front end processor operative to process a received signal from a respective antenna to generate samples;
at least one Fourier transform coupled to the at least one front end processor, each Fourier transform operative to receive samples from a respective front end processor and generate transformed representations of the samples;
a processor coupled to the at least one Fourier transform and operative to process the transformed representations to generate at least one symbol stream, each symbol stream corresponding to a particular transmission being processed; and
at least one demodulator coupled to the demultiplexer, each demodulator operative to receive and demodulate a respective symbol stream to generate demodulated data, wherein the modulated signals are generated and transmitted in a manner to provide antenna, frequency, or temporal diversity, or a combination thereof.
-
-
39. A receiver unit comprising:
-
at least one antenna operative to receive at least one modulated signal that have been previously generated and transmitted by partitioning an input data stream into a plurality of channel data streams, encoding the plurality of channel data streams with at least one encoding scheme, modulating the encoded data with at least one modulation scheme to generate modulation symbols, selectively combining sets of modulation symbols into modulation symbol vectors, and selectively combining modulation symbol vectors to form at least one modulation symbol vector stream, wherein the modulation symbol vectors are generated and transmitted in a manner to provide antenna, frequency, or temporal diversity, or a combination thereof; and
at least one processing unit coupled to the at least one antenna and operative to process at least one received signal to generate output data.
-
-
40. A method for generating and transmitting at least one modulated signal, comprising:
-
receiving an input data stream;
partitioning the input data stream into a plurality of channel data streams;
encoding the plurality of channel data streams with at least one encoding scheme;
modulating the encoded data with at least one modulation scheme to generate modulation symbols;
selectively combining sets of modulation symbols into modulation symbol vectors;
selectively combining modulation symbols to form at least one modulation symbol vector stream; and
transmitting the at least one modulation symbol vector stream from at least one antenna, wherein the modulation symbol vectors are generated and transmitted in a manner to provide antenna, frequency, or temporal diversity, or a combination thereof. - View Dependent Claims (41, 42, 43, 44)
-
Specification