Patent ID: 8737194

Claim:
A receiver system to receive an orthogonal frequency division multiplexing (OFDM) symbol of a certain spectrum efficiency, the receiver system comprising: a guard interval remover to remove a guard interval from the OFDM symbol received by the receiver; a memory device coupled to the guard interval remover, the memory device to store a pulse shaping algorithm; and a pulse shaper coupled to the guard interval remover, the pulse shaper to perform the pulse shaping algorithm to substantially maintain the certain spectrum efficiency of the OFDM symbol in conjunction with the utilization of a Nyquist pulse shape with a guard interval time period that is shorter than a data symbol time period, wherein the pulse shaper comprises a cyclic extension generator, the cyclic extension generator to copy the OFDM symbol and to combine the copy of the OFDM symbol with the OFDM symbol, wherein the combination of copy of the OFDM symbol with the OFDM symbol comprises a cyclically extended OFDM symbol, wherein the pulse shaper further comprises a residual frequency offset estimator coupled to the cyclic extension generator, the residual frequency offset estimator to estimate a residual frequency offset, Δ{tilde over (f)}, and to store the estimated residual frequency offset in the memory device, wherein the estimated residual frequency offset comprises an estimation of a normalized carrier frequency offset, Δf, wherein the pulse shaper further comprises a common phase offset generator coupled to the residual frequency offset estimator, the common phase offset generator to generate a common phase offset from the residual frequency offset estimate, Δ{tilde over (f)}, and to store the generated common phase offset in the memory device, wherein the pulse shaping algorithm comprises the generated common phase offset, and wherein the common phase offset is defined by e −j·2·π·(Δf−Δ{tilde over (f)}) .