Method and system for performing cell selection for OFDM communications
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Abstract
A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
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Citations
61 Claims
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52. A method of performing cell selection at an OFDM receiver comprising:
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at each of at least one receive antenna, sampling a received signal to produce a respective set of time domain samples;
determining at least one course synchronization position;
at each of the at least one receive antenna;
a) performing a frequency domain correlation between at least one received common synchronization sequence extracted from common synchronization channel sub-carriers in the received signal and a corresponding common synchronization sequence of a respective plurality of transmit antennas to identify a plurality of candidate correlation peaks;
b) selecting the M strongest correlation peaks for further processing;
c) at each correlation peak, reconverting time domain samples into frequency domain components and processing pilot channel sub-carriers, these containing transmitter specific information, to identify a transmitter associated with each correlation peak;
d) determining a C/I or similar value for each transmitter thus identified;
selecting the transmitter having the largest C/I determined for any of the at least one receive antenna. - View Dependent Claims (53, 54, 55, 56)
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57. A method comprising:
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receiving a respective OFDM signal at each of at least one receive antenna;
for each of the at least one receive antenna, determining candidate correlation peaks in the frequency domain to identify a plurality of candidate correlation peaks;
determining C/I or similar value for each candidate correlation peak;
performing cell selection or transmitter switching based on the C/I or similar value of the candidate correlation peaks. - View Dependent Claims (58, 59, 60, 61)
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Specification