Systems and methods for range extension by time repetition

1. A method for extending the range of a transmitter by time repetition, the method comprising:

storing a sequence of mapping patterns that map a constellation of symbols to a subset of carriers;

cyclically selecting, at each time interval for each of a plurality of symbols, a mapping pattern of the sequence of mapping patterns according to the sequence such that a first mapping pattern in the sequence is reselected after a last mapping pattern in the sequence;

receiving, at a transmitter block, an input of signals corresponding to data for transmission that includes the plurality of symbols; and

mapping, based on the first mapping pattern, the plurality of symbols to a first subset of carriers;

transmitting the plurality of symbols using the first subset of subcarriers;

repeating the plurality of symbols, reordering the plurality of symbols, and mapping, based on a second mapping pattern, the reordered plurality of symbols to a second set of subcarriers, wherein the second mapping pattern is chosen using the cyclically selected mapping pattern; and

retransmitting the reordered plurality of symbols using the second set of subcarriers.

2. The method of claim 1 , wherein the transmitter block used for repeating the signals and reordering the signals comprises at least one of a repetition and symbol level interleaver, repetition and OFDM symbol interleaver, and repetition and interleaving block.

3. The method of claim 2 , wherein the repetition and interleaving block receives signals processed by an encoder.

4. The method of claim 2 , wherein the repetition and interleaving block receives signals unprocessed by an encoder.

5. The method of claim 1 , wherein the transmitter block comprises at least one of a time-dependent symbol-to-subcarrier mapper and a time-dependent interleaver for mapping a first plurality of consecutive symbols of the reordered plurality of symbols to subcarriers using the second mapping pattern of the sequence of mapping patterns during a first time interval and a second plurality of consecutive symbols of the reordered plurality of symbols to subcarriers using a third mapping pattern of the sequence of mapping patterns during a second time interval, wherein a number of symbols in the first plurality of symbols equals a number of symbols in the second plurality of symbols.

6. The method of claim 1 , further comprising the transmitter block arranging the input of signals into at least one of a grouping of bits and a grouping of symbols.

7. The method of claim 1 , wherein reordering the signals further comprises at least one of consecutive signal interleaving and repetition-wise interleaving.

8. The method of claim 1 , further comprising:

specifying, at the transmitter, a transmission mode;

receiving, at a receiver, an input of signals corresponding to the data for transmission and the specified transmission mode; and

operating on the signals at the receiver, based on the specified transmission mode.

9. The method of claim 8 , wherein specifying a transmission mode further comprises selecting at least one of a custom MCS level and packet length, a transmission mode and packet length, and an MCS level and a packet length.

10. The method of claim 8 , wherein operating on the signals at the receiver further comprises:

detecting an MCS level and a packet length;

decoding the signals; and

based on the decoding, determining a repetition factor used by the transmitter.

11. A system for extending the range of a transmitter by time repetition, the system comprising:

a transmitter configured to send data to a receiver; and

control circuitry configured to:

(i) store a sequence of mapping patterns that map a constellation of symbols to a subset of carriers;

(ii) cyclically select, at each time interval for each of a plurality of symbols, a mapping pattern of the sequence of mapping patterns according to the sequence such that a first mapping pattern in the sequence is reselected after a last mapping pattern in the sequence;

(iii) receive at a transmitter block an input of signals corresponding to data for transmission that includes the plurality of symbols;

(iv) map, via the first mapping pattern, the plurality of symbols to a first subset of carriers;

(v) transmit the plurality of symbols using the first subset of subcarriers;

(vi) repeat the plurality of symbols, reorder the plurality of symbols, and map, via a second mapping pattern, the reordered plurality of symbols to a second subset of subcarriers, wherein the second mapping pattern is chosen using the cyclically selected mapping pattern; and

(vii) retransmit the reordered plurality of symbols using the second set of subcarriers.

12. The system of claim 11 , wherein the transmitter block used for repeating the signals and reordering the signals is at least one of a repetition and symbol level interleaver, repetition and OFDM symbol interleaver, and repetition and interleaving block.

13. The system of claim 12 , wherein the repetition and interleaving block receives signals processed by an encoder.

14. The system of claim 12 , wherein the repetition and interleaving block receives signals unprocessed by an encoder.

15. The system of claim 11 , wherein the transmitter block comprises at least one of a time-dependent symbol-to-subcarrier mapper and a time-dependent interleaver for mapping a first plurality of consecutive symbols of the reordered plurality of symbols to subcarriers using the second mapping pattern of the sequence of mapping patterns during a first time interval and a second plurality of consecutive symbols of the reordered plurality of symbols to subcarriers using a third mapping pattern of the sequence of mapping patterns during a second time interval, wherein a number of symbols in the first plurality of symbols equals a number of symbols in the second plurality of symbols.

16. The system of claim 11 , wherein the transmitter block is configured to arrange the input of signals into at least one of a grouping of bits and a grouping of symbols.

17. The system of claim 11 , wherein the control circuitry reordering the signals is further configured to perform at least one of consecutive signal interleaving and repetition-wise interleaving.

18. The system of claim 11 , further comprising control circuitry configured to:

specify, at the transmitter, a transmission mode;

receive, at a receiver, an input of signals corresponding to the data for transmission and the specified transmission mode; and

operate on the signals at the receiver, based on the specified transmission mode.

19. The system of claim 18 , wherein the control circuitry specifying a transmission mode is further configured to:

select at least one of a custom MCS level and packet length, a transmission mode and packet length, and an MCS level and a packet length.

20. The system of claim 18 , wherein the control circuitry operating on the signals at the receiver is further configured to:

detect an MCS level and a packet length;

decode the signals; and

based on the decoding, determine a repetition factor used by the transmitter.