DMT of Multihop Networks: End Points and Computational Tools

Cascaded orthogonal space–time block codes for wireless multi-hop relay networks

“…In comparison to the strategies of [23,24], COSTBCs only achieve the maximum diversity gain and fall short of achieving the maximum multiplexing gain because of the use of OSTBCs. The decoding complexity of COSTBC, however, is significantly less (linear) than the strategies of [23,24] and makes COSTBCs amenable for practical implementation in comparison to [23,24], where STBCs with high decoding complexity are used. Thus, COSTBCs are well suited for relay-assisted communication where relays are used to improve the cell coverage, by improving reliability of the users at the cell edge, while requiring low decoding complexity.…”

“…COSTBCs, in comparison, achieve the maximum diversity gain with linear decoding complexity (similar to [14][15][16][17][18][19][20][21]) in a multi-hop network with multiple antenna equipped nodes, even though they do not have the single symbol decodable property. For the multi-hop network, the focus of [23,24] is on the construction of DSTBCs that can achieve the optimal diversity multiplexing tradeoff [29]. In comparison to the strategies of [23,24], COSTBCs only achieve the maximum diversity gain and fall short of achieving the maximum multiplexing gain because of the use of OSTBCs.…”

“…For the multi-hop network, the focus of [23,24] is on the construction of DSTBCs that can achieve the optimal diversity multiplexing tradeoff [29]. In comparison to the strategies of [23,24], COSTBCs only achieve the maximum diversity gain and fall short of achieving the maximum multiplexing gain because of the use of OSTBCs. The decoding complexity of COSTBC, however, is significantly less (linear) than the strategies of [23,24] and makes COSTBCs amenable for practical implementation in comparison to [23,24], where STBCs with high decoding complexity are used.…”

“…It is assumed that the relays do not generate their own data. Similar to the model considered in [23,24] we assume that any relay of relay stage n can only receive the signal from any relay of relay stage n − 1, i.e., we consider a directed multi-hop wireless network. This assumption is valid for the case when successive relay stages appear in increasing http://jwcn.eurasipjournals.com/content/2013/1/113…”

“…In prior work, maximum diversity gain achieving DSTBC constructions have been proposed for the twohop network [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], and for the multi-hop network [22][23][24]. Even though these DSTBC constructions achieve the maximum diversity gain, the decoding complexity of most of them, except [14][15][16][17][18][19][20][21], is very high, thereby limiting their use in practical deployment.…”