Methods and apparatus are described for carrying out broadband wireless communications in unlicensed spectrum. Specifically, the approaches use digital modulation techniques derived from Long Term Evolution (LTE) that meet the occupied channel bandwidth requirements of the unlicensed spectrum. In an example, processor circuitry generates an uplink signal that includes a Physical Uplink Shared Channel (PUSCH) signal, and one of a modified Physical Random Access Channel (PRACH) signal or a modified Physical Uplink Control Channel (PUCCH) signal. The modified PRACH signal and the modified PUCCH signal each have an occupied channel bandwidth between 80% and 100% of the nominal channel bandwidth of the unlicensed spectrum, or a minimum occupied channel bandwidth of 2 MHz. The modified PUCCH signal is included in a first one or more subframes of an uplink burst within a fixed frame period of the uplink signal.
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