Multi-level aiding signal to support rapid communication

A receiver, wherein the receiver is configured to perform a method comprising:

• receiving a first wireless signal transmitted by a first transmitter of a plurality of transmitters, wherein the first wireless signal comprises a first long code;
• receiving a first aiding signal transmitted by the first transmitter, wherein the first aiding signal comprises repeating instances of a sequence of short codes, wherein the sequence of short codes includes M distinct short codes and M>1, wherein the sequence of short codes has a predetermined time relationship with the first long code, and wherein the sequence of short codes is specific to the first transmitter;
• and
• acquiring the first long code using the first aiding signal, wherein acquiring the first long code using the first aiding signal comprises identifying the sequence of short codes in the first aiding signal and using the predetermined time relationship to synchronize with the first long code, wherein identifying the sequence of short codes comprises determining each short code of the M distinct short codes.