Multi-antenna transmitter for multi-tone signaling
Embodiments of a communication circuit are described. This communication circuit includes an input node ( 212 ) to receive a set of data symbols and a partitioner ( 216 ) coupled to the input node. The partitioner is to divide the set of data symbols into M irregular subgroups of data symbols, a given one of which includes non-consecutive data symbols in the set of data symbols. Moreover, this given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols. This communication circuit also includes M modulators ( 218 - 1, 218 -N 1 ) coupled to the partitioner, where the given irregular subgroup of data symbols is coupled to a given modulator in the M modulators. Furthermore, the communication circuit includes M output nodes, where a given output node in the M output nodes is coupled to the given modulator and is to couple to an antenna element in M antenna elements ( 226 ).
1. An integrated circuit, comprising:
an input node to receive a set of data symbols;
a partitioner coupled to the input node, wherein the partitioner is to divide the set of data symbols into M irregular subgroups of data symbols, wherein a given irregular subgroup of data symbols in the M irregular subgroups of data symbols includes non-consecutive data symbols in the set of data symbols, and wherein the given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols;
M modulators coupled to the partitioner, wherein the given irregular subgroup of data symbols is coupled to a given modulator in the M modulators; and
M output nodes, wherein the given modulator is coupled to a given output node in the M output nodes, and wherein the given output node is to couple to an antenna element in M antenna elements.
2. The integrated circuit of claim 1 , further comprising the M antenna elements.
3. The integrated circuit of claim 2 , further comprising a multi-element antenna, wherein the multi-element antenna comprises the M antenna elements.
4. The integrated circuit of claim 1 , wherein the M antenna elements are to implement spatial diversity during wireless communication with a second integrated circuit.
5. The integrated circuit of claim 1 , wherein the M irregular subgroups of data symbols are fixed.
6. The integrated circuit of claim 1 , wherein the given modulator includes frequency up-conversion to an associated band of frequencies.
7. The integrated circuit of claim 1 , wherein the given modulator includes an inverse fast Fourier transform (IFFT).
8. The integrated circuit of claim 7 , wherein the IFFT is an N/M-point IFFT, and wherein N is between 32 and 2048 and M is between 2 and 16.
9. The integrated circuit of claim 1 , wherein the M modulators include orthogonal frequency division multiplexing (OFDM).
10. The integrated circuit of claim 1 , further comprising M amplifiers, wherein a given amplifier in the M amplifiers is coupled between the given modulator and the given output node.
11. The integrated circuit of claim 1 , wherein the given irregular subgroup of data symbols includes data symbols corresponding to an OFDM symbol.
12. The integrated circuit of claim 1 , wherein at least two of the M irregular subgroups of data symbols are to include a different number of data symbols.
13. The integrated circuit of claim 1 , wherein the integrated circuit is to reduce a peak-to-average power ratio (PAPR) of a modulated signal at the given output node by more than M −1 relative to the PAPR of a modulated signal corresponding to the set of data symbols.
14. The integrated circuit of claim 1 , further comprising control logic, wherein the control logic is to dynamically allocate data symbols to the irregular subgroups of data symbols in the M irregular subgroups of data symbols based on the set of data symbols.
15. The integrated circuit of claim 14 , further comprising a delay element coupled between the input node and the partitioner, wherein the control logic is to determine the dynamic allocation using a feed-forward loop.
16. The integrated circuit of claim 14 , wherein the dynamic allocation is to reduce an average or a standard deviation of the peak-to-average power ratio (PAPR) of a modulated signal at the given output node.
17. The integrated circuit of claim 14 , wherein the given modulator includes an N-point IFFT.
18. The integrated circuit of claim 17 , wherein N is between 32 and 2048.
19. The integrated circuit of claim 14 , wherein the control logic is to determine the dynamic allocation based on an estimated peak-to-average power ratio (PAPR) at the M output nodes.
20. The integrated circuit of claim 14 , wherein the control logic is to determine the dynamic allocation in order to reduce an estimated peak-to-average power ratio (PAPR) at the M output nodes.
21. The integrated circuit of claim 14 , wherein the control logic is to determine the dynamic allocation using pre-determined allocations corresponding to data symbol patterns in the set of data symbols.
22. A system, comprising:
a first device, wherein the first device includes:
an input node to receive a set of data symbols;
a partitioner coupled to the input node, wherein the partitioner is to divide the set of data symbols into M irregular subgroups of data symbols, wherein a given irregular subgroup of data symbols in the M irregular subgroups of data symbols includes non-consecutive data symbols in the set of data symbols, and wherein the given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols;
M modulators coupled to the partitioner, wherein the given irregular subgroup of data symbols is coupled to a given modulator in the M modulators; and
M antenna elements, wherein the given modulator is coupled to a given antenna element in the M antenna elements, and wherein the given antenna element is to transmit signals corresponding to the given irregular subgroup of data symbols; and
a second device, wherein the second device is to receive signals from the first device via a wireless communication channel, and wherein the second device is to demodulate the received signals and is to detect the set of data symbols.
23. A method for communicating data, comprising:
partitioning a set of data symbols into M irregular subgroups of data symbols, wherein a given irregular subgroup of data symbols in the M irregular subgroups of data symbols includes non-consecutive data symbols in the set of data symbols, and wherein the given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols;
modulating the M irregular subgroups of data symbols using M modulators, wherein the given irregular subgroup of data symbols is modulated using a given modulator in the M modulators; and
transmitting signals using M antenna elements, wherein a given antenna element in the M antenna elements transmits signals from the given modulator.
24. A transmitter, comprising:
a memory;
a communication circuit coupled to the memory, comprising:
an input node to receive a set of data symbols;
a partitioner coupled to the input node, wherein the partitioner is to divide the set of data symbols into M irregular subgroups of data symbols, wherein a given irregular subgroup of data symbols in the M irregular subgroups of data symbols includes non-consecutive data symbols in the set of data symbols, and wherein the given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols;
M modulators coupled to the partitioner, wherein the given irregular subgroup of data symbols is coupled to a given modulator in the M modulators; and
M output nodes, wherein the given modulator is coupled to a given output node in the M output nodes, and wherein the given output node is to couple to an antenna element in M antenna elements.