4G LTE Uplink frame common to FDD and TDD access modes.
Reference signals in UPLINK: LTE Uplink reference signals are preliminarily known as Demodulation Reference Signals (DMRS) or Sounding Reference Signals.
In PUSCH channel, DMRS appears in the fourth resource element of every sub-
In a PUCCH, the demodulation reference signal can appear in any resource elements 1, 2, 3, 4, or 5 depending on which of four PUCCH formats is employed.
It is also possible that sounding reference signals are also present in separate resource blocks.
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