Formatter, method of formatting encoded symbols and wireless communication system employing the same
View Patent ↗The present invention is directed to a formatter, a method of formatting encoded symbols and a wireless communication system employing the same. In one embodiment, the formatter includes a symbol generator that provides a plurality of encoded symbols from a bit stream. The formatter also includes a symbol mapping organizer that maps the plurality of encoded symbols into information cells, each having a unique space coordinate, time coordinate and degree of freedom within a frequency band. The information cells are arranged in a parallelopiped communication resource volume.
1. An apparatus, comprising:
a transmitter including a formatter and an array of transmit antenna elements coupled to receive symbols from the formatter,
wherein the formatter has:
a symbol generator configured to encode a bit stream into a stream of the symbols; and
a symbol mapping organizer configured to separate the stream of symbols into sequences of cells such that each sequence contains an equal number of cells, each symbol is in only one of the cells, and each cell has one or more of the symbols, and wherein each cell in the sequence of cells identifies an associated degree of freedom within a frequency band, the symbol mapping organizer being configured to send each sequence to a corresponding one of the transmit antenna elements for transmission such that the different antenna elements transmit their corresponding sequences in a staggered manner, the transmissions of different sequences being staggered by the same time interval.
2. The apparatus as recited in claim 1 further comprising a volume disconnect generator, coupled to the symbol mapping organizer, configured to provide disconnect cells proximate the cells in the sequence.
3. The apparatus as recited in claim 2 wherein the disconnect cells are configured to be interspersed within the cells in the sequence.
4. The apparatus as recited in claim 2 wherein the disconnect cells are configured to be arranged contiguously in the sequence.
5. The apparatus as recited in claim 1 wherein the degree of freedom within a frequency band is selected from the group consisting of:
a Code Division Multiple Access (CDMA) code,
a distinct frequency sub-band, and
a Time Division Multiple Access (TDMA) slot.
6. A method, comprising:
receiving symbols for transmission from a formatter; and
transmitting the symbols with an array of transmit antenna elements,
wherein formatting in the formatter comprises:
providing a stream of encoded symbols from a bit stream;
separating the stream of encoded symbols into sequences of cells such that each sequence contains an equal number of cells, each symbol is in only one of the cells, and each cell has one or more of the symbols and wherein each cell in the sequence of cells identifies and associated degree of freedom within a frequency band; and
sending each sequence to a corresponding one of the transmit antenna elements for transmission such that the different antenna elements transmit their corresponding sequences in a staggered manner, the transmissions of different sequences being staggered by the same time interval.
7. The method as recited in claim 6 further comprising providing disconnect cells proximate to the cells in the sequence.
8. The method as recited in claim 7 wherein the disconnect cells are interspersed within the cells of the sequence.
9. The method as recited in claim 7 wherein the disconnect cells are arranged contiguously in the sequence.
10. The method as recited in claim 6 wherein the degree of freedom within a frequency band is selected from the group consisting of:
a Code Division Multiple Access (CDMA) code,
a distinct frequency sub-band, and
a Time Division Multiple Access (TDMA) slot.