Unified synchronous ranging channel structure and ranging code generation and detection in wireless OFDMA systems

A base station, comprising:

• a receiver that receives a ranging code sequence, wherein the ranging code sequence is transmitted via a synchronous ranging channel that spans over a radio resource region having a first number of subcarriers along frequency domain, a second number of Orthogonal Frequency Division Multiplexing (OFDM) symbol along time domain, and a third number of time-domain repetition, and wherein the ranging code sequence is partitioned into a second number of code portions and each code portion is allocated in a corresponding OFDM symbol;
• and
• a decoder that decodes the ranging code sequence from a plurality of codes having a corresponding code index, the decoder comprising:
• a summation module that sums a second number of correlated vectors of each code portion for each code index and outputs a summed vector for each code index;
• and
• a peak test module that detects a peak value based on the summed vector for each code index, normalizes each peak value, and compares each normalized peak value with a corresponding threshold value such that a possible code index is detected.