Patent ID: 8098745
Filing Date: 2012-01-17
Classification: H04J,H04L,H04W

Abstract:
1. An apparatus for transmitting a random access signal comprising: a prime-length Zadoff-Chu root sequence selector coupled to a prime-length Zadoff-Chu root sequence generator, wherein the prime-length Zadoff-Chu root sequence generator generates more than one prime-length Zadoff-Chu root sequence, and wherein the prime-length Zadoff-Chu root sequence selector autonomously selects a preamble root sequence from one of the prime-length Zadoff-Chu root sequences; a cyclic shifter for autonomously modifying the preamble root sequence coupled to the prime-length Zadoff-Chu root sequence generator; a sequence modification selector for selecting a preamble root sequence modification coupled to the cyclic shifter; a signal generator coupled to the sequence modification selector, wherein the signal generator generates a signal x(u) from the modified preamble root sequence; and an asynchronous transmitter, wherein the asynchronous transmitter transmits the signal x(u) irrespective of the timing of the target remote receiver.