Channel estimation using the guard interval of a multicarrier signal
US7450490B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2003 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Mar 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2647
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of communication using Orthogonal Frequency Division Multiplexing (“OFDM”) comprises generating bit streams (bnε(0,1),n=0,1, . . . ,K−1) and the corresponding sets of frequency domain carrier amplitudes (XO(k) to XN(k)), where k is the OFDM symbol number, modulated as OFDM symbols to be transmitted from a transmitter. Prefixes are inserted as guard intervals in the sample streams and the OFDM symbols are transmitted from the transmitter to a receiver. The receiver uses information from the prefixes to estimate the Channel Impulse Response (H(F)D) of the transmission channels and uses the estimated Channel Impulse Response (Ĥ(F)D) to demodulate the bit streams in the signals received. The prefixes (αk.co to αk.cD−1) are deterministic and are known to the receiver as well as to the transmitter. Preferably, the prefixes (αk.co to αk.cD−1) comprise a vector (PD) that is common to said symbols multiplied by at least one weighting factor (αk). The weighting factor (αk) preferably differs from one symbol to another but the elements of a given vector (PD) are multiplied by the same weighting factor. Preferably, the weighting factor (αk) has a complex pseudo-random value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.