A new generalized sphere decoding algorithm is proposed for underdetermined MIMO systems with fewer receive antennas N than transmit antennas M. The proposed algorithm is significantly faster than the existing generalized sphere decoding algorithms. The basic idea is to partition the transmitted signal vector into two subvectors xa and xb with N - 1 and M - N + 1 elements respectively. After some simple transformations, an outer layer Sphere Decoder (SD) can be used to choose proper xb and then use an inner layer SD to decide xa, thus the whole transmitted signal vector is obtained. Simulation results show that Double Layer Sphere Decoding (DLSD) has far less complexity than the existing Generalized Sphere Decoding (GSDs).
|Number of pages||4|
|Journal||Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology|
|Publication status||Published - 2005|
- Double layer sphere decoding algorithm,
- Generalized sphere decoding algorithm
- Wireless communications