Patent ID: 8548095

Claim:
A method for configuring a codebook in a multi-input multi-output (MIMO) system, the method comprising: receiving information related to a configuration of the codebook from a transmission end, wherein the information related to the configuration of the codebook comprises an antenna topology, a center frequency, an antenna spacing, an antenna distance, coordinates of antenna elements, number of antennas, an antenna type, or a slant angle; and configuring the codebook based on the received information, wherein the antenna topology is a uniform linear array (ULA) and the codebook applied to eight transmission antennas is: CB k = 1 K ⁢ ( cos ⁢ ( α tx ) + sin ⁡ ( α tx ) ⁢ cos ⁡ ( θ i ) ) ⁢ ⅇ j2π ⁢ ⁢ f c ⁡ ( k - 1 ) ⁢ Δ ⁢ ⁢ d ⁢ ⁢ sin ⁡ ( θ i ) / C where, f c : center frequency (Hz) k: antenna index (k=1, . . . , K) Δd: antenna spacing (meters) (if a cross-polarization antenna is adopted, the spacing means distance between different antenna spots) α tx : antenna slant angle (e.g. 0°, 45°, −45°, 90°) θ i : quantized angle in beam domain (i: selected beam index).