Transmission of preamble code for mobile WiMAX systems
View Patent ↗Embodiments of an apparatus and methods for transmission of timing and synchronization information for mobile WiMAX systems are generally described herein. Other embodiments may be described and claimed.
1. A method, comprising:
processing a superframe containing multiple sequential frames for communication in a wireless communications network using orthogonal frequency division multiplexing (OFDM) techniques, wherein a frame of the multiple sequential frames comprises a secondary advanced preamble (SA preamble) sequence comprised of at least three segments, each segment comprising sub-carriers;
a hardware preamble module interspersing the sub-carriers of each segment from the at least three segments for sub-carrier mapping to sub-carriers pertaining to a single OFDM symbol, wherein a segment-specific SA preamble carrier set in the single OFDM symbol=n+3*k+(40*(NSAP/144))*(2*k/NSAP), where NSAP is a number of sub-carriers in the SA preamble, n is an index for the at least three segments with an ascending index value for each consecutive segment in the at least three segments, and k is a running index from 0 to (NSAP−1);
dividing the SA Preamble into multiple sub-blocks; and
applying a circular-shift SA preamble that is circularly shifted per sub-block in the multiple sub-blocks in relation to the sub-carriers in the single OFDM symbol.
2. The method claim 1 , further including interleaving the multiple sub-blocks over a plurality of antennas.
3. The method of claim 1 , wherein the superframe is processed in an advanced base station (ABS).
4. The method of claim 1 , further including applying differential encoding to the sub-blocks.
5. The method of claim 4 , wherein the circularly-shifted SA preamble corresponds to a segment ID.