Patent ID: 9432235
Filing Date: 2016-08-30
CPC Classification: H04L

Claim Text:
1. A transmitter configured to transmit Orthogonal Frequency Division Multiplexed (OFDM) symbols, wherein the OFDM symbols include a number of sub-carrier signals, the number of sub-carrier signals varying between at least some OFDM symbols, some of the sub-carrier signals carrying data symbols and some of the sub-carrier signals carrying pilot symbols, the pilot symbols comprising scattered pilots symbols and continuous pilot symbols, the continuous pilot symbols being distributed across the sub-carrier signals in accordance with a continuous pilot symbol pattern and the scattered pilot symbols being distributed across the sub-carrier signals in accordance with a scattered pilot symbol pattern, the transmitter comprising: a pilot signal former configured to generate pilot symbols, a number of the pilot symbols generated being different between at least some OFDM symbols, a symbol builder configured to receive a frequency domain data symbol stream and embed the generated pilot symbols from the pilot signal former into the sub-carrier signals of the data symbol stream pilot symbols in accordance with the scattered pilot symbol pattern and the continuous pilot symbol pattern, and an OFDM modulator configured to generate a time domain version of the signal embedded with pilot symbols, wherein the scattered pilot symbol pattern is one of a plurality of scattered pilot symbol patterns and the pilot signal former comprises a memory configured to store a master continuous pilot pattern and to derive the continuous pilot pattern from the master continuous pilot pattern based on the number of sub-carrier signals for an OFDM symbol, and a number of the continuous pilot symbols embedded is modified in accordance with a magnitude of a bandwidth of the OFDM symbol.